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This study explores the synthesis and characterization of three Schiff base compounds, namely N-(2-hydroxybenzylidene)-m-chloroaniline (1), N-(2-hydroxybenzylidene)-m-nitroaniline (2), and N-(2-hydroxybenzylidene)-m-methoxyaniline (3). Comprehensive spectroscopic analyses involving FT-IR, H1NMR, and UV-Vis were employed to elucidate their molecular structures. Theoretical calculations were conducted using the DFT/B3LYP method with the 6-311 + G (d, p) basis set, elucidating electronic transitions and providing comprehensive vibrational assignments. The study identifies key electronic features of these compounds by analyzing global chemical reactivity descriptors. Density functional theory (DFT) was employed to assess the ability of these compounds to scavenge free radicals, both in the gas phase and solvent environment, focusing on three primary mechanisms: hydrogen atom transfer (HAT), stepwise electron-transfer-proton transfer (ET-PT), and sequential proton-loss-electron transfer (SPLET). Additionally, the research explores drug-likeness properties and conducts molecular docking investigations against the ubiquinol cytochrome c reductase protein (UQCRB) to gain further insights into potential biological activities. [ABSTRACT FROM AUTHOR]

A novel ternary Ni(II) complexes, [Ni(5Clsal‐phe)(phen)(H2O)] (1) and [Ni(5Clsal‐phe)(bpy)(H2O)]CH3OH (2), (Schiff base derived from the condensation of L‐phenylalanine and 5‐chlorosalicylaldehyde, phen: 1,10‐phenanthroline, bpy: 2,2′‐bipyridine) has been synthesized. The structure of the complexes was clarified by CHN analysis, FTIR, electronic absorption spectroscopy, ESI‐MS, and X‐ray single crystal diffraction methods. In biological activity studies, the interactions of the complexes with calf thymus DNA (CT‐DNA) were examined using fluorescence spectroscopy. The results show that the complexes could bind to CT‐DNA via a minor groove mode. The interactions of the complexes with bovine serum albumin (BSA) were investigated using electronic absorption and fluorescence spectroscopy techniques, and the BSA quenching mechanism was found. The radical scavenging activity of the complexes was investigated in comparison with hederacolchiside, taxifoline, hederasaponin, arachidonoyl dopamine, and silychristin used as standard. Molecular docking simulations were employed to investigate the interactions between the complexes and biomolecules such as DNA and BSA. The results revealed that the complexes insert into DNA via the minor groove and bind to BSA at subdomains I and IIA. These interactions are facilitated by conventional hydrogen bonds, van der Waals forces, alkyl, and π‐alkyl interactions. [ABSTRACT FROM AUTHOR]

Abstract The aim of presented study was to test nutritional properties of potato tubers and silver ions accumulation pattern after foliar application of silver nanoparticles (AgNPs) during potato vegetation. Potato plants were sprayed with different concentration of Ag nanoparticles (0.1, 1.0 and 10 mg·dm−3) synthesized with incorporation with sodium dodecyl sulphate (SDS) and sodium citrate as stabilizing agent. The lowest amounts of silver ions were transported to the tubers after spraying with AgNPs synthesized with SDS, rather than with citrate. Nevertheless silver ions accumulation in tubers was negligible. SDS method of synthesis was more favourable in terms of nutritional properties of potato tubers. The highest tested concentration of AgNPs_SDS had a favourable effect on a variety of macro- and micronutrients, ascorbic acid and soluble sugars. In turn, lower concentrations of AgNPs_SDS increased the content of phenolic compounds and free radical scavenging efficiency of tubers. These correlations were also confirmed by Principal Component Analysis.

Abstract Phenylpropanoids are naturally occurring secondary metabolites that exhibit various biological activities such as ultra-violet (UV) light protection and reactive-oxygen species (ROS) scavenging. In this study, we utilized a light-emitting diode (LED) based in-situ UV irradiation nuclear magnetic resonance (NMR) technique to monitor the photoisomerization reactions of these phenylpropanoids under UV irradiation in real-time. Through this approach, we measured the photochemical reaction rates and photostationary state (PSS) ratios of these molecules and observed distinct reaction rate and PSS ratio information depending on the variation of substituent groups in each phenylpropanoid molecule. We also evaluated the radical scavenging activity (RSA) for each photochemical product through diphenyl-1-picrylhydrazyl radical (DPPH) assay and 2,2’-azino-bis(3-ethylbenzenthiazoline-6-sulphonic acid) (ABTS) assay. We found that the photoisomerization product of caffeic acid can increase both DPPH and ABTS radical scavenging activities, and confirmed the enhanced ABTS radical scavenging ability of caffeic acid cis-isomer based on the online high-pressure liquid chromatography (HPLC)-ABTS analysis and the PSS ratio information of each isomer.

The aim of presented study was to test nutritional properties of potato tubers and silver ions accumulation pattern after foliar application of silver nanoparticles (AgNPs) during potato vegetation. Potato plants were sprayed with different concentration of Ag nanoparticles (0.1, 1.0 and 10 mg·dm−3) synthesized with incorporation with sodium dodecyl sulphate (SDS) and sodium citrate as stabilizing agent. The lowest amounts of silver ions were transported to the tubers after spraying with AgNPs synthesized with SDS, rather than with citrate. Nevertheless silver ions accumulation in tubers was negligible. SDS method of synthesis was more favourable in terms of nutritional properties of potato tubers. The highest tested concentration of AgNPs_SDS had a favourable effect on a variety of macro- and micronutrients, ascorbic acid and soluble sugars. In turn, lower concentrations of AgNPs_SDS increased the content of phenolic compounds and free radical scavenging efficiency of tubers. These correlations were also confirmed by Principal Component Analysis. [ABSTRACT FROM AUTHOR]

Anthocyanins, typical polyphenol compounds in grape skin, have attracted increasing interest due to their health-promoting properties. In this body of work, five representative anthocyanins (Cy-3-O-glc, Dp-3-O-glc, Pn-3-O-glc, Mv-3-O-glc, and Pt-3-O-glc) were studied using the density functional theory (DFT) to elucidate structure–radical scavenging activity in the relationship and the reaction path underlying the radical-trapping process. Based on thermodynamic parameters involved in HAT, SET-PT, and SPLET mechanisms, along with the structural attributes, it was found that the C4′ hydroxyl group mainly contributes to the radical scavenging activities of the investigated compounds. Pt-3-O-glc exhibits a good antioxidant capacity among the five compounds. The preferred radical scavenging mechanisms vary in different phases. For the Pt-3-O-glc compound, the calculations indicate the thermodynamically favoured product is benzodioxole, rather than o-quinone, displaying considerably reduced energy in double HAT mechanisms. Additionally, the thermodynamic and kinetic calculations indicate that the reaction of •OH into the 4′-OH site of Pt-3-O-glc has a lower energy barrier (7.6 kcal/mol), a higher rate constant (5.72 × 109 M−1 s−1), and exhibits potent •OH radical scavenging properties. Molecular docking results have shown the strong affinity of the studied anthocyanins with the pro-oxidant enzyme xanthine oxidase, displaying their significant role in inhibiting ROS formation. [ABSTRACT FROM AUTHOR]

A series of novel organogermanium(IV) catecholates 1–9 of the general formula R'2Ge(Cat), where R' = Ph, Et, have been synthesized. Compounds were characterized by 1H, 13C NMR, IR spectroscopy, and elemental analysis. The molecular structures of 1–3, 6, and 8 in crystal state were established using single-crystal X-ray analysis. The complexes are tetracoordinate germanium(IV) compounds containing a dioxolene ligand in a dianion (catecholato) form. Electrochemical transformations of target germanium(IV) complexes have been studied by cyclic voltammetry. The electro-oxidation mechanism of complexes 1–5, 7, and 10 (the related complex Ph2Ge(3,5-Cat) where 3,5-Cat is 3,5-di-tert-butylcatecholate) involves the consecutive formation of mono- and dicationic derivatives containing the oxidized forms of redox-active ligands. The stability of the generated monocations depends both on the hydrocarbon groups at the germanium atom and on the substituents in the catecholate ring. Compounds 6, 8, and 9 are oxidized irreversibly under the electrochemical conditions with the formation of unstable complexes. The radical scavenging activity and antioxidant properties of new complexes were estimated in the reaction with DPPH radical, ABTS radical cation, and CUPRACTEAC assay. It has been found that compounds 8 and 9 with benzothiazole or phenol fragments are more active in DPPH test. The presence of electron-rich moieties in the catecholate ligand makes complexes 5 and 7–9 more reactive to ABTS radical cation. The value of CUPRACTEAC for organogermanium(IV) catecholates varies from 0.23 to 1.45. The effect of compounds 1–9 in the process of lipid peroxidation of rat liver (Wistar) homogenate was determined in vitro. It was found that most compounds are characterized by pronounced antioxidant activity. A feature of complexes 1, 3, and 5–9 is the intensification of the antioxidant action with the incubation time. In the presence of additives of complexes 3, 5, 6, and 8, an induction period was observed during the process of lipid peroxidation. [ABSTRACT FROM AUTHOR]

Phenylpropanoids are naturally occurring secondary metabolites that exhibit various biological activities such as ultra-violet (UV) light protection and reactive-oxygen species (ROS) scavenging. In this study, we utilized a light-emitting diode (LED) based in-situ UV irradiation nuclear magnetic resonance (NMR) technique to monitor the photoisomerization reactions of these phenylpropanoids under UV irradiation in real-time. Through this approach, we measured the photochemical reaction rates and photostationary state (PSS) ratios of these molecules and observed distinct reaction rate and PSS ratio information depending on the variation of substituent groups in each phenylpropanoid molecule. We also evaluated the radical scavenging activity (RSA) for each photochemical product through diphenyl-1-picrylhydrazyl radical (DPPH) assay and 2,2'-azino-bis(3-ethylbenzenthiazoline-6-sulphonic acid) (ABTS) assay. We found that the photoisomerization product of caffeic acid can increase both DPPH and ABTS radical scavenging activities, and confirmed the enhanced ABTS radical scavenging ability of caffeic acid cis-isomer based on the online high-pressure liquid chromatography (HPLC)-ABTS analysis and the PSS ratio information of each isomer. [ABSTRACT FROM AUTHOR]

Cold-pressed oils are rich sources of bioactive substances, which may protect triacylglycerols from degradation during frying. Nevertheless, these substances may decompose under high temperature. This work considers the content of bioactive substances in blends and their changes during high-temperature heating. Blends of refined rapeseed oil with 5% or 25% in one of three cold-pressed oils (rapeseed, coriander and apricot) were heated at 170 or 200 °C in a thin layer on a pan. All non-heated blends and cold-pressed oils were tested for fatty acid profile, content and composition of phytosterols, tocochromanols, chlorophyll and radical scavenging activity (RSA) analyzed by 2,2-diphenyl-1-picrylhydrazyl (DPPH), and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) assays. Moreover, the stability of phytosterols, tocochromanols, DPPH and ABTS values was determined in heated blends. All tocochromanols were lost during the heating process, in particular, at 200 °C. However, there were some differences between homologues. α-Tocopherol and δ-tocopherol were the most thermolabile and the most stable, respectively. Phytosterols were characterized by very high stability at both temperatures. We observed relationships between ABTS and DPPH values and contents of total tocochromanols and α-tocopherol. The obtained results may be useful in designing a new type of fried food with improved health properties and it may be the basis for further research on this topic. [ABSTRACT FROM AUTHOR]

A total of fourteen honey samples, including monofloral, polyfloral, and honeydew honeys, collected from Bulgaria, Turkiye, and Morocco were analyzed with the aim to investigate the influence of floral origin on the biological properties of honey. The antioxidant activities of the samples were estimated using the DPPH, ABTS, FRAP, and CUPRAC methods, as well as analyzing their phytochemical composition by measuring the total phenolic content through the Folin- Ciocalteu method and individual polyphenols by HPLC. The results demonstrated that honeydew honey exhibited the highest total phenolic content and antioxidant activity among all the samples tested. It was followed by linden and forest honeys, which also demonstrated significant biological activity. In contrast, acacia and ziziphus honeys displayed the lowest levels of phenolic content and antioxidant properties among the samples. Our results indicated that while the botanical origin of honey had a significant influence on its biological properties, other factors such as geographical location also played a role in determining its quality. The observed variations among the honey samples from the same botanical origin could be attributed to factors such as specific landscape conditions, including whether the honey was sourced from an urban or rural area, the timing of harvest, beekeeping practices, and storage conditions. [ABSTRACT FROM AUTHOR]

This study aims to prepare charge transfer complexes derived from organochalcogenide of arylamide derivatives with different quinones. A new charge-transfer complexes have been developed through a direct reaction between (PhNHCOCH2)2Se, (o-CH3PhNHCOCH2)2Se, and (PhCH2NHCOCH2)2E, where E = S, Se, and Te are electron donors and different quinones are electron acceptors. The quinones used in the reaction were 2,3-dichloro-5,6-dicyanobenzoquinones (DDQ), 7,7’,8,8’-tetracyanoquinodimethane, and tetracyanoethane. The electron donors and electron acceptor mol were 1:1, and the reaction was conducted in acetonitrile. Infrared, 1H and 13C-NMR spectroscopic data characterized all complexes. The complexes’ antioxidant activity was evaluated through α,α-diphenyl-β-picrylhydrazyl at 10–0.312 mg/mL. The results showed that all complexes exhibited promising antioxidant activities. Among them, (PhCH2NHCOCH2)2S·DDQ compound had the least IC50 value of 6.725 mg/mL, indicating a potent scavenging property compared to other compounds. The molecular structures of charge-transfer complexes were investigated using hybrid density functional theory (B3LYP) and basis set 3-21G. We obtained geometrical structures' highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) surfaces and energy gaps through geometric optimization. We also investigated the molecular shapes and contours of the prepared compounds through geometrical optimization and compared the HOMO energy of the CT compounds to investigate donor and acceptor properties.

This study explored, for the first time, the chemical composition and in vitro antioxidant and antibacterial activities of a caper leaf essential oil (EO) emulsion for possible food applications as a natural preservative. The EO was extracted by hydrodistillation from the leaves of Capparis spinosa growing wild in the Aeolian Archipelago (Sicily, Italy) and exhibited a pungent, sulphurous odour. The volatile fraction of the emulsion, analysed by SPME-GC-MS, consisted of over 100 compounds and was dominated by compounds with recognised antibacterial and antioxidant properties, namely dimethyl tetrasulfide (18.41%), dimethyl trisulfide (12.58%), methyl isothiocyanate (7.97%), and terpinen-4-ol (6.76%). The emulsion was effective against all bacterial strains tested (Listeria monocytogenes, Staphylococcus aureus, Escherichia coli, Salmonella enterica subsp. enterica serovar Enteritidis, Pseudomonas fluorescens), with L. monocytogenes exhibiting the lowest minimum inhibitory concentration (MIC = 0.02 mg/mL) while E. coli had the highest (MIC = 0.06 mg/mL). The emulsion had a good DPPH (2,2-diphenyl-1-picrylhydrazine) radical scavenging activity that was dose-dependent and equal to 42.98% at the 0.08 mg/mL level with an IC50 value of 0.099 mg/mL. Based on the results, the caper leaf EO emulsion has the potential to be proposed as a natural alternative to chemical preservatives in the food industry. [ABSTRACT FROM AUTHOR]

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Black cumin (Nigella sativa) and coriander (Coriandrum sativum L.) are common culinary spices that are used singly or combined in the diet of many populations of Ethiopia, and there is a long-held belief of their health-enhancing properties. The present study was designed to investigate the antioxidant properties, phenolic and flavonoid contents of aqueous methanolic extracts from Nigella sativa and Coriandrum sativum L. seed samples. The contents of polyphenols and flavonoids were evaluated by colorimetric method, and antioxidant activity was determined based on the ability to scavenge free radicals by using DPPH assay. An aqueous methanol extract of Coriandrum sativum L. resulted in the highest phenolic content from West Dembia (1.799 ± 0.0011 mg GAE/g), followed by Nigella sativa from East and West Dembia (1.737 ± 0.0014 & 1.734 ± 0.0013 mg gallic acid equivalent per gram (mg GAE/g) respectively) and Coriandrum sativum L. from West Dembia (1.678 ± 0.0018 mg GAE/g) measured by the Folin–Ciocalteu reagent method. The greatest flavonoid content was observed with extracts of Coriandrum sativum L. (1.114 ± 0.0005 mg quercetin equivalents per gram samples (mg QE/g)) from East Dembia district followed by Nigella sativa (1.002 ± 0.0007 (mg QE/g)) as measured by an aluminum chloride colorimetric method, while the least was recorded for Coriandrum sativum L. (0.926 ± 0.0013 mg QE/g) and Nigella sativa (0.764 ± 0.0010 mg QE/g) from West Dembia district. Among the two selected spice extracts, Nigella sativa from East Dembia district displayed the highest DPPH radical scavenging activity with an IC50 value 432-mg ascorbic acid equivalent per gram sample (AAE/g), while Nigella sativa and Coriandrum sativum L. from West Dembia and Coriandrum sativum L. (East Dembia) showed lower antioxidant activities having 372, 320, and 366 mg AAE/g of sample respectively. These results confirmed that Nigella sativa and Coriandrum sativum L. extracts possess appreciable natural antioxidant potentials, thereby providing good justification for their increased domestication and combined food consumption. [ABSTRACT FROM AUTHOR]

The use of targeted drug delivery systems, including those based on selective absorption by certain receptors on the surface of the target cell, can lead to a decrease in the minimum effective dose and the accompanying toxicity of the drug, as well as an increase in therapeutic efficacy. A fullerene C60 conjugate (FA-PVP-C60) with polyvinylpyrrolidone (PVP) as a biocompatible spacer and folic acid (FA) as a targeting ligand for tumor cells with increased expression of folate receptors (FR) was obtained. Using 13C NMR spectroscopy, FT-IR, UV-Vis spectrometry, fluorometry and thermal analysis, the formation of the conjugate was confirmed and the nature of the binding of its components was established. The average particle sizes of the conjugate in aqueous solutions and cell culture medium were determined using dynamic light scattering (DLS) and nanoparticle tracking analysis (NTA). The FA-PVP-C60 showed antiradical activity against •DPPH, •OH and O2•−, but at the same time, it was shown to generate 1O2. It was found that the conjugate in the studied concentration range (up to 200 μg/mL) is non-toxic in vitro and does not affect the cell cycle. To confirm the ability of the conjugate to selectively accumulate through folate-mediated endocytosis, its uptake into cells was analyzed by flow cytometry and confocal microscopy. It was shown that the conjugate is less absorbed by A549 cells with low FR expression than by HeLa, which has a high level of expression of this receptor. [ABSTRACT FROM AUTHOR]

The growing demand for sustainable and alternative protein sources has spurred interest in insect-based and plant-based proteins. Protaetia brevitarsis (PB) larvae and isolated soy protein (ISP) are notable in this regard, offering potential health benefits and nutritional enhancements. We assessed the feasibility of PB larvae and ISP mixtures as alternative food ingredients. Methods included the optimized purification and freeze-drying of PB larvae, extraction and refinement of legume proteins, physicochemical and antioxidant capacity evaluations, DPPH radical scavenging activity measurement, total phenolic and flavonoids content quantification, general component analysis, amino acid profiling using HPLC, fatty acid profiling through gas chromatography, and mineral content analysis using inductively coupled plasma spectrometry. The study found that certain PB:ISP ratios, particularly a 7:3 ratio, significantly improved the blend's antioxidant capacity, as evidenced by DPPH scavenging activity. This ratio also impacted the nutritional profile by altering the mixture's general components, with a notable increase in moisture, crude protein, and fiber and a decrease in crude fat and ash. Amino acid analysis revealed a balanced presence of essential and non-essential amino acids. The fatty acid profile was rich in unsaturated fatty acids, especially in certain ratios. Mineral analysis showed a complex interplay between PB larvae and ISP, with some minerals decreasing and others increasing in the blend. PB larvae and ISP mixtures have significant potential as alternative protein sources, offering a diversified nutritional profile and enhanced antioxidant properties. The 7:3 ratio of PB larvae to ISP has been shown to be particularly effective, suggesting that this ratio may offer an optimal balance for enhancing the overall nutritional quality of the mixture. This study sets the stage for future research to further explore and optimize the potential of these mixtures for human consumption while considering the challenges of consumer acceptance and long-term safety. [ABSTRACT FROM AUTHOR]

In the first phytochemical investigation of specialized metabolites from the stem bark of Alyxia fascicularis, which is used in different traditional medicines, including those of Myanmar and China, five lignans (1-5) and three coumarins (6-8) were isolated by semipreparative HPLC separations and identified mainly by 1D and 2D NMR spectral analysis. The radical scavenging activity of isolated compounds was tested using the DPPH method. Noteworthy, most lignans exhibited antiradical effects comparable to vitamin C and gallic acid. Instead, compounds 1-8 showed no cytotoxic effect on Hela cell line. A possible biosynthetic pathway to enantiomeric 3 and 4 is suggested. [ABSTRACT FROM AUTHOR]

As a functional extraction medium, natural deep eutectic solvents (NADESs) can dissolve various plant metabolites. Those solvents provide untapped potential for creating novel green extracts with distinctive phytochemical signatures and unique biological activities. This is particularly relevant given the rising need for eco-friendly and sustainable skin care products. The main aim of this work was to optimize the most efficient natural deep eutectic solvents (NADESs) for extracting bioactives from 18 medicinal herbs applicable to the cosmetic industry. Selection of the most potent herbs involved assessing their conventional extracts for tyrosinase inhibition, antioxidant activity, and keratinocyte cytotoxicity. Moreover, we analyzed the phenolic profile using ultra-high-pressure liquid chromatography/mass spectrometry (UHPLC/MS) and spectrophotometric assays such as total phenolic (TPC) and flavonoid content (TFC). Using the COSMO-RS method, we modeled the solubility of 12 phenolics in 64 virtual NADESs and selected the 7 most promising ones for further experimental validation. NADESs, including betaine-urea, betaine-proline, and betaine-lysine, were computationally chosen and demonstrated the highest levels of TPC and antioxidative capacity, as confirmed by in vitro assays. The proposed combination of NADES herbal extracts represents a promising natural constituent for the cosmetic industry. [ABSTRACT FROM AUTHOR]

[Cu(5‐ClSal‐Trp)(bpy)]·CH3OH (1) and [Cu(3,5‐ClSal‐Trp)(bpy)]·H2O (2) (5‐ClSal‐Trp: Schiff base derived from 5‐chlorosalicylaldehyde and tryptophan, 3,5‐ClSal‐Trp: Schiff base derived from 3,5‐dichlorosalicylaldehyde and tryptophan, bpy: 2,2′‐bipyridine) have been synthesized and analyzed by CHN analysis, FTIR, electronic absorption spectroscopy, ESI‐MS and XRD techniques. Interaction of the complexes with biomolecules {calf thymus DNA (CT‐DNA) and bovine serum albumin (BSA)} has been researched by fluorescence and electronic absorption spectroscopy. The results show that the complexes can bind via a moderate intercalation binding mode. According to the results obtained with both methods, the logKb and logKSV values of the complexes were found to be very close to each other. BSA quenching mechanism was found to be static. The results showed that the interaction between the complexes and BSA is driven by the hydrogen bond and van der Waals interaction. Additionally, the r values of the complexes (the complex 1 = 0.59 nm and the complex 2 = 0.53 nm) calculated from FRET theory suggested that the distance between the complexes (acceptor) and BSA (donor) is quite close. The complexes exhibited free radical scavenging activity compared to the standard antioxidant β‐carotene and catechin. Antiproliferative efficiency of the complexes on both breast cancer cells (MCF‐7 and MDA‐MB‐231) were also researched using the Sulforhodamine B (SRB) viability assay. It was found that the complex 1 (IC50 = 10.99 μM) exhibited higher cytotoxicity than cisplatin (IC50 = 15.6 μM) against MDA‐MB‐231 cell line. Additionally, intracellular reactive oxygen species (ROS) formation was determined by dihydroethidium (DHE) fluorescent staining. N‐acetylcysteine (NAC) was used as an efficient reactive oxygen species (ROS) scavenger. It was observed that newly synthesized Cu (II) complexes exhibited anti‐growth potential in human breast cancer cells. Additionally, it was determined that the complexes induced reactive oxygen species (ROS) formation in cells in a dose‐dependent manner. [ABSTRACT FROM AUTHOR]

This study sought to purify and identify antioxidant peptides from sheep (Ovis aries) plasma protein hydrolysates and assess their protective impacts on H2O2‐induced Caco‐2 cells. The purification process involved reversed high‐performance liquid chromatography, anion‐exchange chromatography, and Sephadex G‐25. Three peptides, namely Trp‐Glu‐Glu‐Pro‐Ala‐Met (WEEPAM), Ser‐Leu‐His‐Phe‐Met‐Glu (SLHFME), and His‐Cys‐Thr‐Thr‐Phe‐Met‐Ile, with molecular weights of 761.84, 762.87, and 852.03 Da, respectively, were identified by liquid chromatography with tandem mass spectrometry. Among the three antioxidant peptides, superoxide radical (O2−) radical scavenging capacity of WEEPAM and SLHFME was not significantly different from glutathione (GSH) (p > 0.05), while their 1,1‐diphenyl‐2‐picrylhydrazyl radical scavenging capacity was greater than GSH (p < 0.05). WEEPAM revealed increased antioxidant activity after pepsin and trypsin hydrolysis under an in vitro digestion model. In addition, WEEPAM inhibited oxidative damage in Caco‐2 cells by significantly reducing reactive oxygen species accumulation, early apoptosis, malondialdehyde formation, and increasing intracellular superoxide dismutase, glutathione peroxidase, and catalase activities. [ABSTRACT FROM AUTHOR]

The effects of cooking methods, including steaming, deep-frying, and baking, on the phenolic content, 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity, and isomerization of caffeoylquinic acids in sweet potato were investigated. A high correlation was observed between antioxidant capacity and total phenolic content. Deep-frying treatment resulted in higher antioxidant capacity with increasing heating time. The major phenolic components of raw sweet potat were 5-caffeoylquinic acid (CQA) and 3,5-dicaffeoylquinic acid (diCQA), which were reduced by heat treatment due to the isomerization of 5-CAQ to 3- and 4-CQA, and 3,5-diCQA to 3,4- and 4,5-diCQA. Moreover, 5-CQA was more stable than 3,5-diCQA even at 100 °C. Our results demonstrated that by controlling the cooking temperature and time, new bioactive compounds such as mono- and diCQA derivatives can be produced from sweet potato. These data indicate a potential approach for the development of new functional foods from sweet potato by controlling cooking temperature and time. [ABSTRACT FROM AUTHOR]

Achillea millefolium L., commonly known as yarrow, is a versatile and widely distributed plant species with a rich history of ethnopharmacological significance. This study aimed to evaluate the comparative differences of A. millefolium inflorescence morphotypes. The phytochemical profile of white and pink inflorescence morphotypes was characterised by a complex of thirty-four phenolic and triterpene compounds. The species has distinct morphotypes of white and pink inflorescence. Phenolic and triterpenic profiles were determined, and individual compounds were quantified in inflorescence, leaf, and stem samples of two morphotypes tested. The antioxidant activity of plant extracts was evaluated by free radical scavenging (ABTS) and ferric-reducing antioxidant power (FRAP) assays. Caffeoylquinic acids predominated in all parts of the plant tested. Chlorogenic acid and 3,5-dicaffeoylquinic acid were the principal compounds in the phenolic profile. Betulin, betulinic acid, and α-amyrin were the prevailing triterpenic components in the triterpenic profiles of Achillea millefolium morphotypes. The predominant flavonoids in inflorescences were flavones, while in leaves, flavonols were the organ-specific compounds. The quantitative differences were observed between plant parts of morphotypes. Leaves consistently displayed the highest amounts of identified compounds and have been testified as the main source of antioxidant activity. Overall, white inflorescences accumulated a higher total amount of compounds compared to pink ones. The observed differences between morphotypes derived from the same population reflect the differences in specialised metabolites and their chemotypes. This study addresses gaps in knowledge, particularly in phenolic and triterpenic profiling of coloured inflorescence morphotypes, enhancing our understanding of chemotypes and morphotypes within the species. [ABSTRACT FROM AUTHOR]

Four new organic–inorganic hybrid dimethyltin(IV) complexes (1–4) having general formula Me2SnAL which were generated by the reaction of dimethyltin(IV) dichloride with sodium salts of indole-3-acetic acid (AH) and flexible N-phthaloyl amino acids (LH) in 1:1:1 molar ratio in refluxing dry THF. The plausible structure of newly generated complexes has been elucidated on the basis of spectroscopic [IR, NMR (1H,13C,119Sn), HRMS] studies. The suggested five coordinated geometry of the hybrid dimethyltin(IV) complexes have been further supported by computational calculations using density functional theory (DFT). DFT calculations were carried out using B3LYP/6-31G* functional basis set. DFT calculations furnish an insight into the optimized geometry, optimized energy, stability, global reactivity descriptors and frontier molecular orbital (FMO) analysis of newly synthesized organic–inorganic hybrid dimethyltin(IV) complexes. These newly synthesized complexes were also evaluated for their anti-radical activity by DPPH free radical scavenging assay. All the dimethyltin(IV) complexes acted as efficient radical scavengers. [ABSTRACT FROM AUTHOR]

To study the ultrasonic -assisted extraction (UAE) process of oil and proanthocyanidins from Pinus koraiensis seed scales, a single-factor analysis experiment was conducted with oil and proanthocyanidins yield as response values. The Box-Behnken response surface optimization method was applied to determine the optimal process conditions, which were as follows: 67% ethanol aqueous solution, liquid material ratio of 10 ∶ 1 mL/ g, tea saponin mass concentration of 0. 3%, power of 100 W, time of 20 min, water bath temperature of 50 ℃, expected yield of 21. 24% and 3. 03 mg / g respectively, actual yield of 20. 86% and 2. 98 mg / g, relative error of 1. 79% and 2. 97%. Comparison analysis revealed that UAE reached equilibrium in a relatively short time. UAE treatment increased the specific surface area of the seed powder in the solution. The order of DPPH and ABTS + free radical scavenging activities for oil and proanthocyanidins was proanthocyanidins, Ve and oil, indicating that Pinus koraiensis seed scales oil and proanthocyanidins possess good antioxidant capabilities. The use of tea saponin as an inducer for UAE extraction of oil and proanthocyanidins from Pinus koraiensis seed scales demonstrated advantages. These research findings provide a theoretical basis for the in-depth development of Pinus koraiensis seed scales. [ABSTRACT FROM AUTHOR]

The solubilization of butylated hydroxyanisole (BHA) in aqueous surfactant solutions of different architectures (anionic, cationic, and nonionic) has been investigated to improve its aqueous solubility and assess the effect of surfactant‐based multiphase environments on its antiradical activity against 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH). Herein, we report that the micellar encapsulation and DDPH antiradical activity of BHA are highly dependent on the structure and amount of surfactant used. Radical scavenging activity (RSA) and solubilization were efficient in nonionics compared to ionics. DPPH reduction kinetics in micellar media is essential to uncover the behavior of BHA in multiphase environments commonly encountered in different food systems simulated by aqueous micelles. The study is important to identify the optimal medium for improving the solubility and antioxidant capacity of compounds like BHA, and to anticipate the effect of different micro‐heterogeneous/multiphase environments on BHA's antioxidant capability. [ABSTRACT FROM AUTHOR]

Bitter gourd is a valuable cucurbitaceous vegetable rich in various beneficial phytochemicals such phenols, antioxidants, saponins, charantin etc. In spite of high medicinal value bitter gourd faces significant postharvest losses due to factors such as mass reduction, tissue softening, yellowing, and fungal contamination, especially when stored under ambient conditions. To combat these issues, immature green bitter gourd fruits (16 DAP) were subjected to different concentrations of salicylic acid (SA) at 5, 7.5, and 10 mM) and putrescine (PUT) at 1, 2, and 3 mM, through a 15-minute dipping process. In contrast, untreated fruits were dipped in distilled water and served as the control group. These treated and control fruits were subsequently stored at 10 ºC with a relative humidity range of 85–95 % for 20 days. Results showed that among all treatments, bitter gourd fruits treated with 10 mM SA exhibited the most noteworthy outcomes. They retained higher levels of total phenols (26.28 μg GAE 100 g-1), radical scavenging activity (27.95 %), ascorbic acid content (50.0 mg 100 g-1 FW), and total chlorophyll (0.32 mg g-1 FW) on the 20th day of storage. Additionally, the 10 mM SA treatment demonstrated the highest inhibition of α-amylase and α-glucosidase activity, as well as the lowest decay percentage when compared to the control. On the other hand, 3 mM PUT treatment resulted in greater fruit firmness (27.45 N), lower per cent postharvest loss weight (6.60 %), and reduced pectin methyl esterase (PME) activity (0.0075 µmol min-1 g-1 FW). These findings were further validated through principal component analysis (PCA), which highlighted that bitter gourd fruits could be effectively stored for up to 20 days at 10 ºC with pre-storage treatment involving 10.0 mM SA and 3.0 mM PUT. Overall higher quality and shelf-life of bitter gourd were obtained in bitter gourd treated with 10.0 mM SA. Consequently, it is recommended that the application of SA and PUT represents an environmentally friendly approach to preserve the quality of bitter gourd during storage, benefiting both retailers and consumers alike. [Display omitted] • SA and PUT extended the shelf-life of bitter gourd under cold storage condition for 20 days. • SA 10 mM concentration was found effective in retaining the biochemical attributes such as phenols, ascorbic acid, radical scavenging activity (%)and antidiabetic potential of bitter gourd. • PUT 3 mM treatment reduced the weight loss and maintained the fruit firmness by reducing the PME activity. [ABSTRACT FROM AUTHOR]

We provide proof-of-concept for the innovative method of 2,6-dichloroindophenol (DCPIP) for measuring the antioxidant activity of plant extracts. Antioxidant content can be determined using the standard DCPIP test and compare the results with the DPPH results as conventional method. DCPIP operates on the premise that the deep blue color of the oxidized dye is reduced to an invisible solution. Ascorbic acid's antioxidant activity was measured by DCPIP at different times (from 1 to 60 min) and was concentration-dependent, with the maximum activity being at 400 g/mL. In addition, when compared to other incubation durations, the ascorbic acid standard, a natural antioxidant, gave the maximum activity within the first five minutes of incubation with DCPIP. DCPIP is a marker of antioxidant activity both against vitamin C and plant extracts. The DCPIP approach is quick and unaffected by pH variation. The stability of the DCPIP reagent over time (5 and 30 min) and color reduction by ascorbic acid as a natural antioxidant standard were demonstrated using a straightforward and quick method. [ABSTRACT FROM AUTHOR]

Anthocyanins, typical polyphenol compounds in grape skin, have attracted increasing interest due to their health-promoting properties. In this body of work, five representative anthocyanins (Cy-3-O-glc, Dp-3-O-glc, Pn-3-O-glc, Mv-3-O-glc, and Pt-3-O-glc) were studied using the density functional theory (DFT) to elucidate structure–radical scavenging activity in the relationship and the reaction path underlying the radical-trapping process. Based on thermodynamic parameters involved in HAT, SET-PT, and SPLET mechanisms, along with the structural attributes, it was found that the C4′ hydroxyl group mainly contributes to the radical scavenging activities of the investigated compounds. Pt-3-O-glc exhibits a good antioxidant capacity among the five compounds. The preferred radical scavenging mechanisms vary in different phases. For the Pt-3-O-glc compound, the calculations indicate the thermodynamically favoured product is benzodioxole, rather than o-quinone, displaying considerably reduced energy in double HAT mechanisms. Additionally, the thermodynamic and kinetic calculations indicate that the reaction of •OH into the 4′-OH site of Pt-3-O-glc has a lower energy barrier (7.6 kcal/mol), a higher rate constant (5.72 × 109 M−1 s−1), and exhibits potent •OH radical scavenging properties. Molecular docking results have shown the strong affinity of the studied anthocyanins with the pro-oxidant enzyme xanthine oxidase, displaying their significant role in inhibiting ROS formation.

Cold-pressed oils are rich sources of bioactive substances, which may protect triacylglycerols from degradation during frying. Nevertheless, these substances may decompose under high temperature. This work considers the content of bioactive substances in blends and their changes during high-temperature heating. Blends of refined rapeseed oil with 5% or 25% in one of three cold-pressed oils (rapeseed, coriander and apricot) were heated at 170 or 200 °C in a thin layer on a pan. All non-heated blends and cold-pressed oils were tested for fatty acid profile, content and composition of phytosterols, tocochromanols, chlorophyll and radical scavenging activity (RSA) analyzed by 2,2-diphenyl-1-picrylhydrazyl (DPPH), and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) assays. Moreover, the stability of phytosterols, tocochromanols, DPPH and ABTS values was determined in heated blends. All tocochromanols were lost during the heating process, in particular, at 200 °C. However, there were some differences between homologues. α-Tocopherol and δ-tocopherol were the most thermolabile and the most stable, respectively. Phytosterols were characterized by very high stability at both temperatures. We observed relationships between ABTS and DPPH values and contents of total tocochromanols and α-tocopherol. The obtained results may be useful in designing a new type of fried food with improved health properties and it may be the basis for further research on this topic.

Abstract Bacterioruberin and its rare glycosylated derivatives are produced by Arthrobacter agilis as an adaptation strategy to low temperature conditions. The high antioxidant properties of bacterioruberin held great promise for different future applications like the pharmaceutical and food industries. Microbial production of bacterioruberin via a cost-effective medium will help increase its commercial availability and industrial use. The presented study aims to optimize the production of the rare C50 carotenoid bacterioruberin and its derivatives from the psychotrophic bacteria Arthrobacter agilis NP20 strain on a whey-based medium as a cost effective and readily available nutritious substrate. The aim of the study is extended to assess the efficiency of whey treatment in terms of estimating total nitrogen content in treated and untreated whey samples. The significance of medium ingredients on process outcome was first tested individually; then the most promising factors were further optimized using Box Behnken design (BBD). The produced carotenoids were characterized using UV–visible spectroscopy, FTIR spectroscopy, HPLC–DAD chromatography and HPLC-APCI-MS spectrometry. The maximum pigment yield (5.13 mg/L) was achieved after a 72-h incubation period on a core medium composed of 96% sweet whey supplemented with 0.46% MgSO4 & 0.5% yeast extract and inoculated with 6% (v/v) of a 24 h pre-culture (109 CFU/mL). The cost of the formulated medium was 1.58 $/L compared with 30.1 $/L of Bacto marine broth medium. The extracted carotenoids were identified as bacterioruberin, bis-anhydrobacteriouberin, mono anhydrobacterioruberin, and glycosylated bacterioruberin. The presented work illustrates the possibility of producing bacterioruberin carotenoid from Arthrobacter agilis through a cost-effective and eco-friendly approach using cheese whey-based medium. Graphical Abstract

Objective: Pteropyrum scoparium Jaub. & Spach locally known as “Sidaf” is a meal known to the ancient Omani people with many health benefits. It is traditionally used in Oman to treat high cholesterol, hypertension, indigestion problems, wound healing, and diabetes. However, these claims are yet to be scientifically proven. Hence, this study aimed to perform phytochemical, antioxidant, and antimicrobial analysis of P. scoparium leaves aqueous and alcoholic extracts to confirm its medicinal potential. Methods: A detailed phytochemical analysis of ethanol and aqueous extracts of leaves was carried out to confirm the presence of bioactive substances. DPPH (2,2′-diphenyl-1-picrylhydrazyl), agar-well diffusion and disc diffusion methods were used to evaluate antioxidant and antimicrobial potential, respectively. The extracts were tested against four microorganisms viz. E. coli (ATCC 25922), S. aureus (ATCC 23235), Penicillium sp. (ATCC 11597) and Rhizopus stolonifer (ATCC 14037). Results: The ethanol extract exhibited higher DPPH scavenging activity than aqueous extract that was confirmed with IC50 values of both extracts. However, the aqueous extract was found to be significantly more effective as an antimicrobial agent than the ethanol extract. This could be due to higher coumarins content that is thrice as much as in ethanol extract. One-way repeated measure RM ANOVA showed that there was a statistically significant difference in the antimicrobial susceptibility of all four organisms for the aqueous and ethanol well diffusion extracts (DF = 7; SS = 56.350, MS = 8.050; F = 5.865; P

Galgal or Hill lemon (Citrus pseudolimon Taraka) is a lesser known variety of Citrus indigenous to northern India with potential medicinal benefits. The objective of the research was to optimize extraction conditions for achieving maximum recovery of total phenolic content (TPC), total flavonoid content (TFC) and antioxidant potential in terms of radical scavenging activity (RSA) from ethanolic extracts of in vitro callus cultures, leaf and peel tissues of galgal. The callus was obtained from the seeds germinated under in vitro conditions. MS medium supplemented with 2,4-D (4.0 mgL− 1) + Kinetin (0.5 mgL− 1) was found to be the best medium for callus induction. The extracts from callus, leaves and peel were different concentrations of ethanol/water solution at different temperatures and extraction times. The maximum TPC and TFC were achieved in extracts prepared using treatment with E:W ratio 50 at 50 °C for 30 min in leaf (TPC 6.86 ± 0.04 mg gallic acid g− 1 dw and TFC 3.16 ± 0.02 mg rutin g− 1dw) and peel (TPC 9.88 ± 0.03 mg gallic acid g− 1 and TFC 4.81 ± 0.02 mg rutin g− 1dw) extracts and E:W ratio 25 at 50 °C for 30 min for callus extract (TPC 4.9 ± 0.04 mg gallic acid g− 1 dw and TFC 2.57 ± 0.03 mg rutin g− 1dw). The maximum RSA was observed in extract prepared using E:W ratio 50 at 50 °C for 30 min (45.5 ± 1.3%, 40.2 ± 0.2% and 23.2 ± 0.8%in peel, leaves and callus respectively). The correlation analysis revealed positive correlation among TPC, TFC and RSA of peel, leaf and callus extracts. Thus, various tissues of galgal along with their callus cultures could act as sources of bioactive compounds which could be used for medicinal purposes. [ABSTRACT FROM AUTHOR]

Barleria albostellata C.B. Clarke (Acanthaceae) is a plant native to South Africa and relatively few studies have been performed on it. Species in this genus are known for their ethnopharmacological and phyto-medicinal values. In this study, the total flavonoid and phenolic contents and the antioxidant and cytotoxic activities of hexane, chloroform, and methanol extracts were evaluated at five different concentrations (15, 30, 60, 120, and 240 μg/mL). The antioxidant activity of the extracts of B. albostellata was assessed in vitro using the 2,2′-diphenyl-1-picrylhydrazyl (DPPH) scavenging and ferric reducing antioxidant power (FRAP) assays, while the phenolic content was determined using a Folin–Ciocalteu assay. The extracts' cytotoxicity was established using a 3-[(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide] (MTT) assay in human embryonic kidney (HEK293), cervical cancer (HeLa), and breast adenocarcinoma (MCF-7) cell lines. Methanolic leaf extracts had the highest total flavonoid content (42.39 ± 1.14 mg GAE/g DW) compared to other solvents. Additionally, the total phenolic content was the greatest in the methanol leaf extract (6.05 ± 0.09 GAE/g DW), followed by the methanol stem extracts (2.93 ± 0.73 GAE/g DW). The methanolic leaf and stem extract concentrations needed for 50% inhibition (DPPH) were 16.95 µg/mL and 14.27 µg/mL, respectively, whereas for FRAP, the reducing powers of all extracts were considerably lower than the ascorbic acid standard. The IC50 values of extracts tested in the three cell lines were >63 µg/mL. According to the findings of our study, the leaves and stems of B. albostellata are rich in several bioactive compounds that may be a possible source of natural antioxidants and may have the potential to treat certain diseases. The extraction of the bioactive compounds from the leaves and stems of B. albostellata using bioassay-guided fractionation and the assessment of their safety will be essential for further investigations into this species in the search of potential novel therapeutic drug leads. To the best of our knowledge, this is the first report of the cytotoxic activities of leaf and stem extracts of Barleria albostellata. [ABSTRACT FROM AUTHOR]

Ten novel benzylidine‐N‐phenylhydrazine‐1‐carboxamide derivatives (7 a–7 j) were synthesized in three steps and evaluated for their tyrosinase inhibitory and antioxidant activities. The spectrophotometric method with L–DOPA as a substrate was used to determine tyrosinase inhibitory activities, and a DPPH assay was used to evaluate antioxidant properties. Among the synthesized compounds, compound 7 c with an ethyl substitution on the C2‐N‐phenylacetamide ring showed the highest tyrosinase‐inhibition activity (IC50=4.36±1.58 μM), which was comparable with that of standard kojic acid (IC50=16.34±1.93 μM). Compounds (7 d) and (7 e) showed potent antioxidant activities (EC50=52.11±4.18 and 92.47±3.32 μM, respectively), which were comparable to those of quercetin. The study of the interactions and binding modes of the tested compounds was accomplished with molecular docking. Docking results corroborated that the active inhibitors were well placed in the mushroom tyrosinase enzyme's active site. [ABSTRACT FROM AUTHOR]

This study explored, for the first time, the chemical composition and in vitro antioxidant and antibacterial activities of a caper leaf essential oil (EO) emulsion for possible food applications as a natural preservative. The EO was extracted by hydrodistillation from the leaves of Capparis spinosa growing wild in the Aeolian Archipelago (Sicily, Italy) and exhibited a pungent, sulphurous odour. The volatile fraction of the emulsion, analysed by SPME-GC-MS, consisted of over 100 compounds and was dominated by compounds with recognised antibacterial and antioxidant properties, namely dimethyl tetrasulfide (18.41%), dimethyl trisulfide (12.58%), methyl isothiocyanate (7.97%), and terpinen-4-ol (6.76%). The emulsion was effective against all bacterial strains tested (Listeria monocytogenes, Staphylococcus aureus, Escherichia coli, Salmonella enterica subsp. enterica serovar Enteritidis, Pseudomonas fluorescens), with L. monocytogenes exhibiting the lowest minimum inhibitory concentration (MIC = 0.02 mg/mL) while E. coli had the highest (MIC = 0.06 mg/mL). The emulsion had a good DPPH (2,2-diphenyl-1-picrylhydrazine) radical scavenging activity that was dose-dependent and equal to 42.98% at the 0.08 mg/mL level with an IC50 value of 0.099 mg/mL. Based on the results, the caper leaf EO emulsion has the potential to be proposed as a natural alternative to chemical preservatives in the food industry.

The growing demand for sustainable and alternative protein sources has spurred interest in insect-based and plant-based proteins. Protaetia brevitarsis (PB) larvae and isolated soy protein (ISP) are notable in this regard, offering potential health benefits and nutritional enhancements. We assessed the feasibility of PB larvae and ISP mixtures as alternative food ingredients. Methods included the optimized purification and freeze-drying of PB larvae, extraction and refinement of legume proteins, physicochemical and antioxidant capacity evaluations, DPPH radical scavenging activity measurement, total phenolic and flavonoids content quantification, general component analysis, amino acid profiling using HPLC, fatty acid profiling through gas chromatography, and mineral content analysis using inductively coupled plasma spectrometry. The study found that certain PB:ISP ratios, particularly a 7:3 ratio, significantly improved the blend’s antioxidant capacity, as evidenced by DPPH scavenging activity. This ratio also impacted the nutritional profile by altering the mixture’s general components, with a notable increase in moisture, crude protein, and fiber and a decrease in crude fat and ash. Amino acid analysis revealed a balanced presence of essential and non-essential amino acids. The fatty acid profile was rich in unsaturated fatty acids, especially in certain ratios. Mineral analysis showed a complex interplay between PB larvae and ISP, with some minerals decreasing and others increasing in the blend. PB larvae and ISP mixtures have significant potential as alternative protein sources, offering a diversified nutritional profile and enhanced antioxidant properties. The 7:3 ratio of PB larvae to ISP has been shown to be particularly effective, suggesting that this ratio may offer an optimal balance for enhancing the overall nutritional quality of the mixture. This study sets the stage for future research to further explore and optimize the potential of these mixtures for human consumption while considering the challenges of consumer acceptance and long-term safety.

Omeprazole, a proton pump inhibitor, is used for gastric and duodenal ulcers, gastroesophageal reflux disease, Helicobacter pylori infection, etc. Current research is based on the loading of omeprazole on surface silver nanoparticles by chemical method. The appearance of an absorption peak at 421 nm confirmed the synthesis of nanoparticles. The FT-IR further confirmed the conjugation of functional groups present in omeprazole moiety with silver. The size and morphology were elucidated by transmission electron microscopy and X-ray diffraction which revealed a spherical shape with an average particle size of 16–20 nm. To know enhancement in their efficacy, the omeprazole-loaded nanoparticles were evaluated against antibacterial, urease inhibition, and antioxidant activities. Nanoparticles showed significant antibacterial potential against Staphylococcus aureus and Escherichia coli with 12 ± 0.41 and 13.6 ± 1.02 mm zones of inhibition, respectively. Almost 2.43 times enhanced urease inhibitory activity was found for nanoparticles (IC50 = 2.17 ± 0.10 µg·mL−1) as compared to omeprazole (IC50 = 5.28 ± 0.14 µg·mL−1). The radical scavenging activity of nanoparticles also increased significantly. The synthesized nanoparticles were docked in the active site of urease to investigate their binding mode. Due to excellent urease and bacterial inhibition, these nanoparticles can be used for ulcers.

The effects of cooking methods, including steaming, deep-frying, and baking, on the phenolic content, 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity, and isomerization of caffeoylquinic acids in sweet potato were investigated. A high correlation was observed between antioxidant capacity and total phenolic content. Deep-frying treatment resulted in higher antioxidant capacity with increasing heating time. The major phenolic components of raw sweet potat were 5-caffeoylquinic acid (CQA) and 3,5-dicaffeoylquinic acid (diCQA), which were reduced by heat treatment due to the isomerization of 5-CAQ to 3- and 4-CQA, and 3,5-diCQA to 3,4- and 4,5-diCQA. Moreover, 5-CQA was more stable than 3,5-diCQA even at 100 °C. Our results demonstrated that by controlling the cooking temperature and time, new bioactive compounds such as mono- and diCQA derivatives can be produced from sweet potato. These data indicate a potential approach for the development of new functional foods from sweet potato by controlling cooking temperature and time.

Achillea millefolium L., commonly known as yarrow, is a versatile and widely distributed plant species with a rich history of ethnopharmacological significance. This study aimed to evaluate the comparative differences of A. millefolium inflorescence morphotypes. The phytochemical profile of white and pink inflorescence morphotypes was characterised by a complex of thirty-four phenolic and triterpene compounds. The species has distinct morphotypes of white and pink inflorescence. Phenolic and triterpenic profiles were determined, and individual compounds were quantified in inflorescence, leaf, and stem samples of two morphotypes tested. The antioxidant activity of plant extracts was evaluated by free radical scavenging (ABTS) and ferric-reducing antioxidant power (FRAP) assays. Caffeoylquinic acids predominated in all parts of the plant tested. Chlorogenic acid and 3,5-dicaffeoylquinic acid were the principal compounds in the phenolic profile. Betulin, betulinic acid, and α-amyrin were the prevailing triterpenic components in the triterpenic profiles of Achillea millefolium morphotypes. The predominant flavonoids in inflorescences were flavones, while in leaves, flavonols were the organ-specific compounds. The quantitative differences were observed between plant parts of morphotypes. Leaves consistently displayed the highest amounts of identified compounds and have been testified as the main source of antioxidant activity. Overall, white inflorescences accumulated a higher total amount of compounds compared to pink ones. The observed differences between morphotypes derived from the same population reflect the differences in specialised metabolites and their chemotypes. This study addresses gaps in knowledge, particularly in phenolic and triterpenic profiling of coloured inflorescence morphotypes, enhancing our understanding of chemotypes and morphotypes within the species.

Here, anisidine-based ligand (HL) and its cobalt (1a), nickel (1b) and copper (1c) complexes were synthesized and characterized by various spectroscopic techniques such as NMR, mass, IR, UV–visible, magnetic moments, ESR and TGA. The synthesized [Ni(L)2] and [Cu(L)2] complexes demonstrated square planar geometry around the metal centers, while the cobalt complex [Co(L)2(H2O)2] adopted six coordinated octahedral geometries. The DNA interaction studies of the complexes revealed an intercalative mode of binding, as evidenced by UV absorption, emission, and viscosity experiments, and the binding constant (Kb) follows the order of 1c > 1a > 1b. When exposed to oxidative and photolytic methods, the complexes demonstrated better efficacy in cleaving double-stranded pBR322 DNA compared to their parent Schiff base. When tested for cytotoxicity against A549 and MCF7 cell lines, complexes showed more activity than their parent ligand. In-vitro studies of the complexes' antimicrobial and antioxidant properties shown that they are far more effective than the parent ligand. Further, the biological efficiency of the ligand (HL) and complexes were verified by computational methods, including molecular docking (against protein data bank PDB ID: 2ADO.pdb) and pharmacokinetic studies, both the ligand (HL) and complexes have demonstrated significant potency. This promising result indicated their potential as therapeutic agents for treating pathogen-induced deformities.

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Background: The use of conventional astaxanthin extraction methods, typically involving organic solvents, leads to a heightened environmental impact. The aim of this study was to explore the potential use of environmentally friendly extraction solvents, such as vegetable oils, for recovering the shrimp by-product astaxanthin. Methods: Ultrasound-assisted extraction (UAE) in vegetable oils, including olive oil (OO), sunflower oil (SO), and flaxseed oil (FO), was employed to extract astaxanthin. The astaxanthin antioxidant activity was evaluated using an ABTS assay, and a mixture of gum Arabic and soy lecithin was used to form coacervates to produce astaxanthin encapsulation. Results: A by-product–vegetable oil ratio of 1:60, extraction time of 210 min, 60% amplitude of the extraction process, and the use of OO as the extracting medium resulted in an astaxanthin yield of 235 ± 4.07 μg astaxanthin/g by-products. The astaxanthin encapsulation efficiency on day 0 and astaxanthin recovery on day 1 were recorded at 66.6 ± 2.7% and 94.4 ± 4.6%, respectively. Conclusions: The utilization of OO as an extraction solvent for astaxanthin from shrimp by-products in UAE represents a novel and promising approach to reducing the environmental impact of shrimp by-products. The effective astaxanthin encapsulation efficiency highlights its potential application in food industries. [ABSTRACT FROM AUTHOR]

In order to evaluate the influence of seed priming with extracts of different seaweeds—Ascophyllum nodosum (An), Sargassum angustifolium (Sa), Chlorella vulgaris (Cv), and Arthrospira platensis (Ap)—on characteristics of leafy lettuce cultivar New Red Fire under different levels of salt stress (irrigation with saline water with electrical conductivity levels of 1.37 as control, 2.5, 4, 5.5, and 7 dS m−1), an experiment was conducted during the 2021–2022 season. The highest germination speed was recorded in seeds soaked in Cv. Vigor index decreased by 58.68% in non-primed seeds compared to Cv-primed seeds. Increasing the salinity level from 4 to 5.5 dS m−1 led to a significant decrease (3.30%) in seedling plumule length. Salinity induction led to increased leaf taste index. The lowest leaf free proline content was recorded under a salinity level of 1.37 dS m−1. Seed priming with seaweed extract led to a significant increase in leaf flavonoid content. The highest peroxidase enzyme activity was recorded in Cv-treated plants under salinity levels of 5.5 and 7 dS m−1. Seed priming with seaweed extract led to an increase in antioxidant activities, osmolyte accumulation, photosynthetic pigment content, and salt tolerance of mature plants. Cv and Ap could be introduced as the best priming solutions to neutralize the negative effects of salinity. A salinity level of 4 dS m−1 could be considered as a salt tolerance threshold for the New Red Fire cultivar. Cultivation of this cultivar under salinity levels of 5.5 and 7 dS m−1 can seriously damage qualitative and quantitative lettuce parameters. [ABSTRACT FROM AUTHOR]

Pecan (Carya illinoinensis) nuts are rich in functional compounds (unsaturated fatty acids, phytosterols, polyphenols, and tocopherols) associated with various health benefits. Commercially, pecan nuts are roasted to enhance their physical, chemical, and sensory properties. In the present study, response surface methodology (RSM) was used to optimise the quality and nutritional and antioxidant attributes of 'Wichita' pecan nuts roasted by using a microwave process with a range of microwave power (96.45–803.55 W) and roasting time (1.37–5.62 min). The microwave-roasted pecan nuts were analysed for hardness, total colour difference (TCD), and radical scavenging activity and modelled using the central composite design. The results showed that microwave power and roasting time significantly (p < 0.05) influenced the quality attributes of the pecan. The quadratic model adequately described the changes in TCD and hardness, respectively, while the 2FI model adequately described the changes in DPPH radical scavenging activity. To obtain the desired pecan nuts quality attributes (TCD = 1863.391; hardness = 28.755 N and DPPH radical scavenging activity = 33.877 mmol Trolox/g), the determined conditions were 700 W and 2.24 min, with a desirability of 0.557. The primary unsaturated fatty acids, including cis-oleic, cis-linoleic, α-linolenic, and stearic acids, were not affected (p < 0.05) by microwave roasting the pecan nuts at determined conditions. Volatile compounds, such as alcohols, aldehydes, ketones, lactones, hydrocarbons, and carboxylic acids, were identified in both raw and microwave-roasted pecan nuts, with limonene, which possesses various health properties, being the major volatile compound. It can be concluded that microwave roasting may be optimised using response surface methodology to produce quality pecan nuts that can be used as snacks or as an ingredient in other snack products. [ABSTRACT FROM AUTHOR]

Bacterioruberin and its rare glycosylated derivatives are produced by Arthrobacter agilis as an adaptation strategy to low temperature conditions. The high antioxidant properties of bacterioruberin held great promise for different future applications like the pharmaceutical and food industries. Microbial production of bacterioruberin via a cost-effective medium will help increase its commercial availability and industrial use. The presented study aims to optimize the production of the rare C50 carotenoid bacterioruberin and its derivatives from the psychotrophic bacteria Arthrobacter agilis NP20 strain on a whey-based medium as a cost effective and readily available nutritious substrate. The aim of the study is extended to assess the efficiency of whey treatment in terms of estimating total nitrogen content in treated and untreated whey samples. The significance of medium ingredients on process outcome was first tested individually; then the most promising factors were further optimized using Box Behnken design (BBD). The produced carotenoids were characterized using UV–visible spectroscopy, FTIR spectroscopy, HPLC–DAD chromatography and HPLC-APCI-MS spectrometry. The maximum pigment yield (5.13 mg/L) was achieved after a 72-h incubation period on a core medium composed of 96% sweet whey supplemented with 0.46% MgSO4 & 0.5% yeast extract and inoculated with 6% (v/v) of a 24 h pre-culture (109 CFU/mL). The cost of the formulated medium was 1.58 $/L compared with 30.1 $/L of Bacto marine broth medium. The extracted carotenoids were identified as bacterioruberin, bis-anhydrobacteriouberin, mono anhydrobacterioruberin, and glycosylated bacterioruberin. The presented work illustrates the possibility of producing bacterioruberin carotenoid from Arthrobacter agilis through a cost-effective and eco-friendly approach using cheese whey-based medium. [ABSTRACT FROM AUTHOR]

Plants are an important source for the discovery of antimicrobial formulations due to the many biologically active components they contain. In this study, in vitro antimicrobial and antibiofilm forming activities of ethanolic extract of Origanum munzurense were investigated against some strains of foodborne pathogenic bacteria. To investigate the antimicrobial activity, the minimal inhibitory concentration values against the selected bacteria and antibiofilm-forming activity were tested with the liquid microdilution method and microplate method, respectively. MICs of Origanum munzurense extract against the bacteria tested are 32 mg/mL for Escherichia coli O157: H7 ATCC 35150, 32 mg/mL for Escherichia coli O157: H7 ATCC 43895, 16 mg/mL for Salmonella enteritidis ATCC 13076, 16 mg/mL for Salmonella typhimurium ATCC 700408, 32 mg/mL for S. typhimurium ATCC 14028, and 2 mg/mL for Pseudomonas fluorescens ATCC 13525. Origanum munzurense showed the best antibacterial effect on Pseudomonas fluorescens ATCC 13525 strain. The least antibacterial effect was shown on E. coli O157:H7 ATCC 35150, E. coli O157:H7 ATCC 43895, and Salmonella typhimurium ATCC 14028. Origanum munzurense extract inhibited biofilm formation on Salmonella enteritidis ATCC 13076 strain at a concentration of 16 mg/mL. Antibiofilm formation was not observed for other bacteria. Total phenolic content of Origanum munzurense was 539 mg of gallic acid equivalent (GAE)/L. 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging capacity. munzurense extract was determined to be 18 µg/L. In conclusion, Origanum munzurense ethanol extract has a range of antibacterial effects on the selected foodborne pathogenic bacteria and showed antibiofilm-forming activity especially for S. enteritidis ATCC 13076. In addition, the plant has the prominent amount of phenolic content with antioxidant and radical scavenging activity. [ABSTRACT FROM AUTHOR]

This study aimed to evaluate the wound healing activity of an ointment containing the hydroethanolic extract of Salvia Tomentosa (S. tomentosa) in a dermal wound model using rabbits. Ointments with concentrations of 2.5% (w/v) and 5% (w/v) were prepared using the hydroethanolic extracts of S. tomentosa. An in vivo excisional wound model was embloyed with New Zealand rabbits (n = 35) to assess the wound healing activity of these ointments. Rabbits were randomly divided into five experimental groups: negative (received no treatment), vehicle (received only the ointment vehicle), positive control (treated with Fitokrem®), and those treated with 2.5% (w/v) and 5% (w/v) S. tomentosa ointments. Wound diameters were measured using calipers on the 4th, 8th, and 14th days, and histopathological examinations were conducted on the 3rd, 7th, and 14th days of treatment. The total phenolic content of the S. tomentosa hydroethanolic extract was determined to be 61.52 ± 2.33 µg of Gallic Acid Equivalents per mg of dry plant material. The total phenolic content and 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity of the hydroethanolic extract of Salvia tomentosa were determined spectrophotometrically. In terms of wound closure, both 2.5% and 5% S. tomentosa ointments demonstrated wound healing activity comparable to that of Fitokrem®. In conclusion, S. tomentosa exibits a positive effect on dermal wound healing in rabbits. [ABSTRACT FROM AUTHOR]

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