Search

In our previous study, retinyl palmitate was successfully encapsulated by melt dispersion using waxes as shell materials. Herein, the objective of the present research is to evaluate the shelf life and kinetic release of the developed microcapsules. The study was conducted by measuring actual loading capacity over a period of time using spectroscopic analysis. The transfer percentage of particles from nonwoven facial wipes to skin-like surfaces was also investigated by simulating the rubbing mechanism with a robotic transfer replicator. Although particles stored as powder form under room temperature showed only eight days of shelf-life, particles stored as a dispersion in a refrigerator maintained 60% of the theoretical loading capacity after one month. The kinetic release profile of the particles in ethanol with shaking at 100 rpm and 37±2°C showed an initial burst in the first half an hour, followed by a sustained release. It also showed that 98% of the retinyl palmitate content released within 4 h. Particles incorporated into wet nonwoven wipes gave approximately 22% transfer to skin-like fabric. Thus, the study shows potentials of delivering skincare properties by means of retinyl palmitate capsule loaded textile substrates.

Tomato (Solanum Lycopersicum L. (or) Lycopersicon esculentum Mill.) is being a very nutritious and health protective food, are highly perishable nature. Its sensitivity to postharvest loss due to poor handling, diseases and physical injury limits its successful marketing. Therefore, simple technology is required to reduce the postharvest loss of this commodity. The use of edible coatings with bio-extracts appears to be a good alternative preservation technique to extend the mature tomato fruits. This study was, therefore, initiated to investigate the effect of using bio- extracts garlic bulba and capsicum incorporation with coating materials (maize starch and beeswax on physicochemical quality of tomato fruit stored at ambient conditions (temperature 15.5 to 20.2oC and relative humidity of 55.5 to 67.3%). The experiment was conducted using complete randomized design of two varieties (Fetane and Melkashola) and six treatments. The tomato fruits were coated by dipping into solution for 3 minutes. The treatments prepared were on coating solution of MGE( 9.5% maize starch with 0.5% garlic extract), MCE (9.5% maize starch with 0.5% capsicum extract), BCE (9.5% beewax mixed with 0.5% capsicum extract), BGE (9.5% beewax mixed with 0.5% garlic extract), 10% maize starch without bio-extract, 10% beewax without bio- extract and control. The treatment means were tested at significance level of P ≤ 0.05. The effectiveness of bio-extracts with coating materials on physicochemical quality of tomato fruits were evaluated at three days intervals for 30 days. There was a significance difference (P

This study integrates the complex research conducted on the sources of brown discolorations that occur on marble statues (fifteenth century) of the Church of Orsanmichele in Florence (Italy). They underwent conservative interventions in the past and the brownish discolorations on their surfaces strongly altered the clear tone of the marble. In this study, Carrara marble model specimens were treated with organic and inorganic substances (non-pasteurised milk; linseed oil; walnut oil; ammonium oxalate; microcrystalline wax; beeswax; milk + linseed oil; and milk + ammonium oxalate + linseed oil) to simulate their effects on the stone. Some of the substances were commonly used in the past (as on the Orsanmichele statues) but most of them are still used in many countries. The treated specimens were exposed to natural and artificial ageing. The main results of the research were (i) the specimens treated with linseed oil, milk + linseed oil, and milk + linseed oil + ammonium oxalate showed a severe change of colour after either artificial or natural ageing; (ii) an extensive polymerisation of the organic substances occurred; (iii) calcium oxalate and several oxidised diacylglycerols (DAGs) and triacylglycerols (TAGs) were the last chemical products of the oxidation processes induced by ageing; (iv) Maillard reaction, producing brownish coloration, likely occurred in specimens containing milk as a result of the interaction between sugars and proteins.

In this study, beeswax is studied as a phase change material (PCM) to store heat due to its high latent heat. The disadvantages of using beeswax were its low thermal conductivity and high melting point. To enhance the thermal conductivity of beeswax, nanoparticles (of Al2O3, ZnO, and FeO) and other phase change materials are used to decrease its melting point. In the present investigation, the melting point of beeswax was lowered by the addition of other organic PCMs like lauric acid, capric acid, and coconut oil. FeO nanoparticles (3 wt%) were found to give the best result for thermal conductivity enhancement of 112% compared to Al2O3 and ZnO with enhancements of 18.78% and 15.56%, respectively, at 5 mass%. Coconut oil was used to decrease the melting of the beeswax as it was the most stable and easily available one resulting in a melting point of 52 °C. An investigation was performed to study the effect of hot fluid flow rates (1 LPM and 2 LPM) and inlet temperatures (60 °C, 70 °C, and 80 °C) on the charging time of beeswax composite. The study showed that 50:50 mass% of beeswax and coconut oil and its composite with 1 mass% of FeO nanoparticle give us the best result out of all the other composites. The charging time of the material was found to be 15 min less than the composite without nanoparticles.

Investment casting (IC) process is one of the oldest and most advanced to manufacture components with excellent surface finish, close dimensional tolerance and complex shape. The property of the final cast part depends upon the property of the wax pattern. The present study investigated the development of wax blend pattern by using various waxes, namely paraffin wax, microcrystalline wax, beeswax, polyethylene wax and carnauba wax. The injection parameters were injection temperature (IT), die temperature (DT), injection flow rate (IFR) and holding time (HT), while output process parameters were surface roughness (SR), needle penetration (NP), linear shrinkage (LS) and volumetric shrinkage (VS). A L27 orthogonal array with grey-fuzzy logic was used to optimize the injection process parameter with multiple output characteristics. The results indicated that the optimized process parameters significantly improved the properties of the wax blend pattern used in the investment casting process.

Graphic abstract Based on aphid wax–honeydew marble and the hydrophobic wax structure of lotus and its derived applications with superareophilic and superhydrophobic properties, edible carnauba wax and beeswax particles were mixed and utilized to mimic lotus wax and wrap liquid, thus forming liquid marbles (LMs). Through the utilization of continuous production system (CPS), wax as an interfacial surfactant, water and solid, air-phase or mixed-phase marble content was produced. The edible liquid marble (ELM) could encapsulate water and food droplets. Edible solid marble (ESM) and edible solid hollow marbles (ESHMs) could be fabricated by applying pectin or syrup. Moreover, through the heating of wax powders with different melting temperatures, stable tablets and hollow capsules could be produced. The wax powder as interfacial surfactant could firmly bind with pectin through hydrogen bonds on ESM. The edible LMs can therefore be applied for residue reduction, corrosion reduction, biohazard prevention and cleaning in the food industry. The other phase LMs could act as novel tools in the pharmaceutical and food industries with the above-mentioned water transport, preservation, sustained releasing and selective releasing abilities. Supplementary Information The online version contains supplementary material available at 10.1007/s42242-021-00158-z.

The effects of various physical state lipids (rapeseed oil (RO), shortening (ST), beeswax (BW)), on the physicochemical properties of starch (S) (hydroxypropyl distarch phosphate (HP), oxidized hydroxypropyl starch (OS))/gelatin (G) blown films were studied. S/G-lipid blends showed decreased storage modulus and complex viscosity. The formation of hydrogen bonds was inhibited by the ST and BW, but facilitated by the RO. Compared with BW and ST, RO was more effective to promote the melted and fractured of starch. Lipids addition promoted the compatibility of starch and gelatin. The presence of the lipids significantly improved the surface hydrophobicity, mechanical, water vapor barrier and water resistance properties of S/G films. S/G-RO films exhibited the strongest surface hydrophobicity and tensile strength, while HP/G-BW film showed the strongest water resistance and water vapor barrier properties. These results revealed that the appropriate lipids could be used to produce S/G-lipid films with desirable physicochemical properties.

Despite previous efforts, the fabrication of superhydrophobic substrate via an environment friendly and easy approach remains a great challenge. In this study, a low cost, simple, and green procedure was developed to prepare a superhydrophobic paper surface that is acceptable for the papermaking industry. First, a wax mixture (beeswax & carnauba wax) was emulsified and coated on the filter paper surface. Then, the coated paper was annealed at different temperatures. The further heat-treatment-rendered wax-coated paper hydrophobic or superhydrophobic because submicrometer or micrometer wax structures were present on the paper surface. The water contact angle of the annealed filter paper sample reached 151.5° at 60 °C, and the sliding angle was under 10°. Further, the relationship between surface composition and the hydrophobic properties of the coated paper samples was discussed. The obtained paper samples showed great potential in water/oil separation, as they had an efficiency over 99%. This work proposed a new simple and mild approach to fabricate superhydrophobic filter papers and explored the hydrophobicity and water/oil separation properties.

Honey bee queen health is crucial for colony health and productivity, and pesticides have been previously associated with queen loss and premature supersedure. Prior research has investigated the effects of indirect pesticide exposure on queens via workers, as well as direct effects on queens during development. However, as adults, queens are in constant contact with wax as they walk on comb and lay eggs; therefore, direct pesticide contact with adult queens is a relevant but seldom investigated exposure route. Here, we conducted laboratory and field experiments to investigate the impacts of topical pesticide exposure on adult queens. We tested six pesticides commonly found in wax: coumaphos, tau-fluvalinate, atrazine, 2,4-DMPF, chlorpyriphos, chlorothalonil, and a cocktail of all six, each administered at 1, 4, 8, 16, and 32 times the concentrations typically found in wax. We found no effect of any treatment on queen mass, sperm viability, or fat body protein expression. In a field trial testing queen topical exposure of a pesticide cocktail, we found no impact on egg-laying pattern, queen mass, emergence mass of daughter workers, and no proteins in the spermathecal fluid were differentially expressed. These experiments consistently show that pesticides commonly found in wax have no direct impact on queen performance, reproduction, or quality metrics at the doses tested. We suggest that previously reported associations between high levels of pesticide residues in wax and queen failure are most likely driven by indirect effects of worker exposure (either through wax or other hive products) on queen care or queen perception.

This study was carried out to determine the effect of beeswax coating and cold storage condition on the shelf life of nectarine fruit. A total of 240 nectarine fruits were collected and divided into six treatments, each with 40 fruits. The treatments consisted of coated fruits stored at 6°C (T1), coated fruits stored at 1°C (T2), coated fruits stored at ambient temperature (T3), uncoated fruits stored at 6°C (T4), uncoated fruits stored at 1°C (T5) and uncoated fruits stored at ambient temperature (T6). Physico-chemical data and sensory attributes were taken at five days interval. The results showed that there was a significant difference between treatments (p≤ 0.05) for both physico-chemical properties and sensory attributes during the storage time (50 days). The result showed that the highest percentage of titratable acidity (1.45± 0.06) and total soluble solids (15.32±0.91°Brix) as well as highest mean scores of sensory parameters such as flavor (4.23±0.06), sourness (4.12±0.07), appearance (4.49±0.05), taste (4.27±0.06), texture (4.19±0.07) and overall acceptability (4.25±0.05) were recorded for coated nectarine fruits stored at 6°C followed by coating and storage at 1°C. On the other hand, the highest weight loss percentage (25.27±3.67) and pH value (4.29±0.16) and the lowest mean scores values for sensory evaluation were recorded for uncoated fruits stored at ambient temperature (22°C). The shelf life of beeswax coated fruit stored at cold storage was extended by 50 days following the deterioration of uncoated fruit stored at ambient temperature after three days. Therefore, nectarine fruits coated with beeswax and stored at temperatures of 1 and 6°C had prolonged shelf life without affecting its nutritional quality. Key words: Attributes, bee, coating, nectarine, physico-chemical, properties, sensory, wax.

Application of beeswax as a hydrophobic agent in MDF technology. The aim of this study was to investigate the possibility of using beeswax as a hydrophobic agent in MDF board technology. In scope of the work, dry-formed fibreboards in four variants of wax content were produced under laboratory conditions: 0; 0.5; 1 and 5%, and boards with 1% of industrial hydrophobic agent. Produced boards were tested for selected physical and mechanical properties. Obtained results proved that beeswax can be used as a sterling hydrophobic agent. Furthermore, the tests confirmed an improvement in mechanical properties after the application of beeswax.

Lipophilic sea buckthorn pomace extract isolated by supercritical CO2 (LSBPE) was structurized with different amounts of carnauba wax or beeswax as oleogelators. Oleogels were also made with added water at an LSBPE:water ratio of 70:30. LSBPE was characterized by a favorable ratio of omega-6 to omega-3 fatty acids (1:3) and reasonable amounts of omega-7 fatty acids (4.45% of total), tocopherols (63.0 mg/100 g) and carotenoids (700.1 mg/100 g). The oleogels were characterized by their structural and rheological properties, and physical and chemical stability during storage. Carnauba wax produced a gel-like structure with a highly condensed network of aggregated crystals, while beeswax oleogels displayed elongated crystals which formed interconnected networks. Carnauba wax gels were harder than beeswax gels with better oil-binding capacity and higher crystallization and melting temperatures. Both oleogels showed good physical and oxidative stability during storage due to the immobilization of oil in the three-dimensional structures, and the presence of strong lipophilic antioxidants in LSBPE, respectively. As the proportion of waxes increased from 5 to 17.5%, the hardness, oil-binding capacity, crystallization, and melting temperatures increased in both gels due to the more developed crystalline associations. Addition of water had no significant effect on the physical and chemical stability of oleogels during storage. Water was distributed as small droplets in the crystalline network of oleogelators. However, hardness and oil-binding capacity decreased as water was added. Rich in polyunsaturated fatty acids and bioactive compounds, LSBPE oleogels offer the opportunity to deliver bioactives while simultaneously acting as fat substitutes.

We developed a novel BW-CS/ZnHA biocomposite utilizing Beeswax-Chitosan and Zinc-hydroxyapatite nanoparticles (ZnHAP). The uniformed mixture of beeswax-chitosan and ZnHAP was freeze-dried to get a porous biocomposite. The fabricated biocomposite was characterized using FTIR, XRD, and SEM. Moreover, the antibacterial, swelling, biodegradations, viability, and cell proliferation capacity of the fabricated biocomposite was assessed. The biocomposite demonstrated upgraded swelling and antibacterial activity. The addition of ZnHAP accomplished the antibacterial activity. Biocompatibility studies were carried out using osteoblast cells and thus we proved the non-toxic nature of the biocomposite. Osteoblast cell adhesion investigations demonstrated that the cells were appended and infiltrated into the inside of the biocomposite. The obtained results encourage the use of these bandages for various types of wounds with infection and exudates.

Prolonged use of tight-fitting PPE, e.g., by COVID-19 healthcare workers leads to skin injuries. An important contributor is the shear exerted on the skin due to static friction at the skin-PPE interface. This study aims to develop an optimised wax-oil lubricant that reduces the friction, or shear, in the skin-PPE contact for up to four hours. Lubricants with different wax-oil combinations were prepared using beeswax, paraffin wax, olive oil, and mineral oil. In-vivo friction measurements involving seven participants were conducted by sliding a polydimethylsiloxane ball against the volar forearms to simulate the skin-PPE interface. The maximum static coefficient of friction was measured immediately and four hours after lubricant application. It was found that the coefficient of friction of wax-oil lubricants is mainly governed by the ratio of wax to oil and the thermal stability and morphology of the wax. To maintain long-term lubricity, it is crucial to consider the absorption of oil into the PPE material. The best performing lubricant is a mixture of 20 wt% beeswax, 40 wt% olive oil, and 40 wt% mineral oil, which compared to unlubricated skin, provides 87% (P = 0.0006) and 59% (P = 0.0015) reduction in instantaneous and 4-hour coefficient of friction, respectively.

A synthetic acaricide, amitraz is widely used to control Varroa destructor. Although it has the potential to kill mites in honey bee colonies, the residue of amitraz and its metabolites in honey pr...

BACKGROUND A national survey on pesticides in recycled beeswax originating from beekeeping has been conducted in Switzerland for almost three decades. It allowed obtaining a good overview of the lipophilic products used for beekeeping within the last 30 years. RESULTS The use of the veterinary drugs containing bromopropylate or tau‐fluvalinate two decades ago led to substantial residues in commercial beeswax. These contaminants are still detectable although in Switzerland the corresponding products have been out of use for many years. The level of coumaphos substantially increased in 2015 up to an annual value of 3.25 mg·kg−1, suggesting that at least a few beekeepers used coumaphos‐containing products. Consequently, an information campaign was launched, and the annual value decreased again. Maximal levels of thymol up to an annual value of 87.5 mg·kg−1 were measured in 2009. Since that time, a steady decrease of thymol residues suggests that beekeepers less frequently use thymol‐containing products. Twenty‐five years ago, 1,4‐dichlorobenzene (PDCB) was widely used for the control of the wax moth, resulting in residues in beeswax up to an annual value of 10.9 mg·kg−1 whereas nowadays, PDCB residues are rarely detected in Swiss beeswax. CONCLUSIONS Our survey illustrates that several beekeeping‐associated pesticides persist in recycled beeswax for many years. Most recent analyses show lower residue levels in Swiss beeswax as compared to previous years. Nowadays Swiss beekeepers mostly use hydrophilic substances for treatment against the Varroa destructor that do not accumulate in beeswax, thus reducing exposure of the honey bees to lipophilic contaminants., A national survey shows that several beekeeping‐associated pesticides remain in recycled beeswax for many years even when the corresponding products are no longer used. © 2021 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

In this paper, multilayer pectin-beeswax/colophony-pectin (P-BC-P) films including different proportions of beeswax/colophony mixtures were prepared in order to reduce the water vapor permeability. FTIR, XRD, DSC, polarized light microscopy (PLM), and water vapor permeation assays were performed. Characterization techniques showed (i) polar interactions between beeswax and colophony at the amorphous phase, (ii) changes in beeswax crystalline phase from sponge-like to needle-like structure, and (iii) formation of a eutectic mixture at BC3 70/30 ratio which guides the epitaxial crystallization of beeswax. Pure pectin films showed low resistance to the water vapor permeation (361 × 10−13 g m m−2 s−1 Pa−1), while multilayer films showed major control over the transport process. P-BC3-P showed one of the lowest water vapor permeability (WVP) values (56 × 10−13 g m m−2 s−1 Pa−1) and the closest WVP value to that of polyethylene films (LDPE 5.8 × 10−13 g m m−2 s−1 Pa−1). This result was attributed to the ordered crystalline structure reached by the epitaxial crystallization of beeswax within the hydrophobic phase.

The study examined the effect of stearin and paraffin adulteration of the wax foundation on brood survival. In combs formed on a stearin-adulterated wax foundation (10, 30, and 50% stearin, which means: 3.9, 11.7, and 19.5% of stearic acid, respectively), the survival of brood decreased statistically significantly (p ≤ 0.001) compared to the survival rates noted on a pure beeswax foundation. The brood appearance resembled the so-called scattered brood although the queens oviposited normally. The scattered brood was caused by the death of young larvae, most probably due to changes in the properties of royal jelly. Larvae transferred into stearin-adulterated wax cups died as well. The adulteration of the wax foundation with paraffin (10, 30, and 50%) did not reduce the survival of the brood but lowered the mechanical strength of the combs. Adulteration of wax with even a small amount of stearin/stearic acid makes it useless for apiculture.

The development of ready-to-eat foods containing bioactive extracts represents an important step to improve food consumption. This study aimed to develop a yogurt containing an encapsulated bioactive yerba mate extract. For this, the lyophilized extract was protected through encapsulation in solid lipid particles (SLPs) of beeswax. An encapsulation efficiency (EE) greater than 90% was achieved with an extract content higher than 20%. The FTIR spectrum of the capsules’ wall material, indicated that beeswax efficiently encapsulated the yerba mate extract. The extract antioxidant potential was protected for 45 days under cold storage, and the encapsulation maintained the viability of the yogurt lactic acid bacteria. The increase in free fatty acids from seven to 33% during in vitro digestion indicated the capsule rupture during the digestion process. Moreover, the extract encapsulation maintained viable lactic acid bacteria in yogurt. The addition of SLPs did not affect the acceptability of the yogurt or the consumers’ intention to buy the product. However, the score attributed to the product evaluators was surprisingly low and portrayed the consumer's preference for foods with added sugar. This work introduced a natural, ready-to-eat and health-promoting food product containing SLP-protected antioxidant compounds. The addition of compounds encapsulated in foods is promising and can benefit consumers.

Supercritical impregnation may be used to impart specific functional properties into porous substrates such as wood, textiles, or paper. In the current study, food-grade beeswax (BW), carnauba wax (CW) and vegetable wax (VW) were impregnated into paper substrates to improve their hydrophobicity and mechanical strength. The contact angle of impregnated and annealed samples was approximately 110–120° when annealed at 140 °C, and 130° when annealed at 160 °C. SEM analyses revealed that dual micro- and nano-scale roughness was generated in impregnated paper substrates that also underwent annealing. FTIR analysis showed evidence of H-bonding between the waxes and cellulose, but this was more dominant with BW/CW compared with VW due to the different chemical structures of the waxes. Annealed samples showed lower intensity FTIR peaks, tentatively confirming a phase transition of the waxes as a result of the annealing. A reduced tan delta signal up to the secondary alpha transition temperature for paper was observed with BW/CW impregnated samples, indicating the formation of additional chemical bonds between cellulose and wax. Compared with untreated paper substrates, the sharp decrease in storage modulus during degradation occurred at temperatures up to 10 °C higher for wax-impregnated papers, and up to 40 °C lower for baseline papers impregnated and annealed without wax. It is believed that the H-bonds between the waxes and cellulose were able to withstand higher temperatures in the degradation region, thus offsetting the effects of sample preparation.

In this study, a tea polyphenol (TP) loaded beeswax gelator (TP gelator) was constructed and incorporated into soybean oil to improve the oxidative stability of oleogels. The effects of TP on the structure and storage stability of oleogels were investigated. The TP gelator prepared by embedding TP into beeswax improved the dispersity of TP in lipids. The thermal characteristics and X-ray diffraction analysis showed that the components of the TP gelator coexisted homogeneously and TP was well dispersed in beeswax. The Fourier-transform infrared spectra indicated that the phenolic hydroxyl group of TP had intermolecular force with the quaternary ammonium nitrogen in the choline portion of soybean lecithin. The formation of needle-like crystals by beeswax restricted the flow of liquid oil, and TP did not participate in the construction of the internal network structure of the oleogel. In the accelerated storage experiment at 60 °C, the peroxide value of the TP loaded oleogel decreased by 60.6% at the end of the storage period compared with soybean oil. TP was successfully embedded in the oleogel without changing its structure, which not only solved the problem of poor dispersion of TP in oil, but also showed a significant inhibitory effect on lipid oxidation.

This study is on the influence of various natural nutrient media on the morphometrics of larvae of the large wax moth Galleria mellonella L. at the VII stage of its development, their survival, the degree of weaving of the cobweb and the construction of tunnels. The relationship between the weight, body length and width of head capsule of the larvae in culture has been evaluated. The correlation coefficient between the survival rate and the addition of medicinal herbs to the main feed was calculated. The ranking of larvae was made according to their fresh body weight at an interval of 50 mg. The chemical composition of the larvae and the product of their vital activity in the form of excrement is shown, and also the relationship with other indicators is established. An analysis of the metabolic byproduct of G. mellonella larvae studied by X-ray photoelectron spectroscopy (XPS) on a SPECS electron spectrometer, showed that the metabolic byproduct contains a high % of oxygen in two nonequivalent chemical states - 31%, nitrogen - 7.2%, carbon - 61%; and with less of potassium and phosphorus (0.6%). The product of vital activity is beeswax, which is mainly myricin-ester of long chain acids and aliphatic alcohols. A positive relationship existing between morphometrics with various natural nutrient media has been brought out. These results will be of use in increasing the survival, growth and development of wax moth larvae in mass culture, to get more biomass and valuable cobweb.

A mixed edible wax coating on elastic substrates comprising sphere-shaped carnauba wax and flake-shaped beeswax superhydrophobic particles with a two-stage application (before/after stretching) shows durability against abrasion, scratch healing, self-cleaning performance, and sealing ability after stretching.

Mango is harvested in summer months and exhibits short postharvest life due to rapid biochemical changes. These ripening changes occur even at low temperature storage, though at slower rates. Hence, the effect of Aloe vera gel (AVG) and beeswax coatings on physico-chemical parameters and enzymatic activities in mango cv. Dusehri were evaluated for 28 days under low temperature (9-11 °C, 90-95 % RH). Fruits were coated with AVG (50 and 100 %) and beeswax (1.5 and 3.0 %) while control fruits were left uncoated. As compared to control, both AVG and beeswax coatings significantly delayed the pulp colour development in fruits throughout the storage. These coatings also reduced weight loss and maintained titratable acidity in mango fruits. At 21st day of storage, beeswax 3.0 % coated fruits retained 54.06 % higher fruit firmness and 43.18 % lower weight loss than the untreated fruits. Both edible coatings efficiently retarded the polygalacturonase (PG) and cellulase activities as compared to control fruits. In coated fruits, the enzymatic activities increased up to 21 days of storage, while the control fruits exhibited a decline in enzymatic activities after 14 days. The beeswax coatings were more effective in increasing the storage life of mango fruits under low temperature conditions.

Nesta investigação, os dados experimentais para a vulcanização da borracha natural (NR) e do copolímero de estireno-butadieno (SBR) com óleos vegetais de amendoim, coco e linhaça, além da cera de abelha, foram validados através da modelagem molecular das principais reações do processo. O método semiempírico AM1 (Austin Model 1) permitiu comprovar que a redução da dureza, associada à solubilidade na matriz elastomérica, é o fator que permite que ácidos graxos insaturados de 12 ou mais átomos de carbono ajam como ativadores em associação com o óxido de zinco. Porém, o impedimento estérico torna o ácido lignocérico, presente na cera de abelha, um ativador de baixo desempenho. Para os ácidos graxos insaturados de 18 carbonos, presentes nos óleos de amendoim e linhaça, as insaturações aumentam a reatividade das espécies geradas na vulcanização. No entanto, tal alteração de natureza produz efeito adverso, pois provavelmente induz reações laterais que comprometem o papel ativador dos óleos.

Bu çalışmada, depolama süresince meyve barlarında gerçekleşen fizikokimyasal değişiklikleri önlemek için peynir altı suyu protein izolatı (PASP) ve vaks (balmumu veya karnauba mumu) bazlı yenilebilir kaplamalar test edilmiştir. Örneklerin kuru madde içeriği (96.16-98.43 g/100 g), renk, sertlik (54.17-258.16 N), toplam fenolik madde içeriği (3097.7-9752.9 mg GAE/kg dm), askorbik asit içeriği (133.4-203.9 mg/kg dm), antioksidan aktivite (DPPH: 3681.1-4538.6 mg/kg dm, FRAP: 2531.5-3057.4 mg/kg dm) ve peroksit değeri (1.85-2.06 meq peroksit / kg yağ) belirlenmiştir. Yenilebilir kompozit kaplama, PASP kaplı numunelere kıyasla daha yüksek kuru madde içeriği ve sertlik sağlamıştır. PASP karnauba mumu ile kaplanmış numunelerin toplam fenolik içeriği en düşük iken, bu örnekler en yüksek askorbik asit içeriği ve antioksidan aktiviteye sahip olmuştur. Depolama süresi boyunca kuru madde içeriği ve peroksit değeri dışında analiz edilen tüm parametrelerde kademeli bir düşüş gözlenmiştir. Genel olarak, meyve barları için PASP ve karnauba mumu bazlı kompozit yenilebilir kaplama önerilmektedir., Composite edible coating of fruit bars using whey protein isolate (WPI) and waxes (beeswax or carnauba wax) was tested in the present study to prevent physicochemical changes during storage in the present study. Dry matter content (96.16-98.43 g/100 g), colour, hardness (54.17-258.16 N), total phenolic content (3097.7-9752.9 mg GAE/kg dm), ascorbic acid content (133.4-203.9 mg/kg dm), antioxidant activity (DPPH: 3681.1-4538.6 mg/kg dm, FRAP: 2531.5-3057.4 mg/kg dm) and peroxide value (1.85-2.06 meq peroxide/kg oil) of samples were determined. Composite edible coating resulted in higher dry matter content and hardness compared to WPI-coated samples. While the total phenolic content of samples coated with WPI+carnauba wax was the lowest, it provided the highest ascorbic acid content and antioxidant activity. A gradual decrease in all analysed parameters except dry matter content and peroxide value was observed throughout the storage period. Overall, edible coating using WPI and carnauba wax composite was suggested for fruit bars.

Production of waxes from spent perlite, which is a waste of sunflower oil winterization, is studied. Winterization is characterized by significant losses of oil with filter powders, and waste utilization is an environmental and economic problem. At the same time, winterization waste contains valuable components – wax and oil, which can be used in different ways. The content of waxes in spent perlite using hexane (18%), as well as the quality indicators of the obtained wax: melting point 70°C, saponification number 115mg KOH/g, acid number 2.6mg KOH/g, mass fraction of moisture 0,82% are determined. Spent perlite was treated with a solution of sodium chloride during boiling, settling of the obtained mass, washing and drying of wax. The dependence of the yield and melting point of the extracted waxes on the processing parameters: the concentration of sodium chloride solution, temperature and duration of settling is found. Rational conditions for spent perlite processing are determined: the concentration of sodium chloride solution – 7.5%, settling temperature – 20°C, settling duration ‑ 10hours. The experimentally determined wax yield at this point is 14.3%. Quality indicators of the wax sample obtained under rational conditions are studied: melting point 68°С, saponification number 110mg KOH/g, acid number 2.8mg KOH/g, mass fraction of moisture 0.85%. These values correlate with the data for wax extracted using hexane, as well as with reference data on the quality of beeswax and sunflower wax. The data obtained allow recycling spent perlite without organic solvents, which makes the process more environmentally friendly and cost-effective, as well as solves environmental problems associated with the utilization of winterization waste