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The present study was performed to utilize the microalgae biomass as a potential source for fatty acids and to evaluate its bioactivity through an antioxidant assays for the microalga Nannochloropsis sp. The alga comprises maximum saturated fatty acids (52.23 ± 0.481%), followed by polyunsaturated fatty acids (25.49 ± 0.043%) and monounsaturated fatty acids (22.28 ± 0.643%), respectively. Proximate composition and the active functional group Nannochloropsis sp. were analyzed by standard biochemical methods and Fourier transform infrared (FTIR) analysis. Antioxidant potential of the methanolic extract was evaluated by total antioxidant activity, 1,1-diphenyl-2-picrylhydrazyl (DPPH), superoxide radical scavenging, and hydroxyl radical scavenging assays. In all these assays, activity was expressed in concentration dependent manner and maximum activity was recorded at higher concentration of 250 µg/ml. This study concludes that Nannochloropsis sp. possessed the potential antioxidant properties and fatty acid profile. So, this alga can be used as a natural antioxidant to prevent the oxidative stress and various industrial applications like aqua feed formulation, biofuel production, and biomedicine in the future.

This study aimed to investigate the phytochemical profile, the antibacterial and antioxidant activities of mass cultured Spirulina platensis and the structural characterization of the methanolic extracts. S. platensis was isolated from estuary and mass cultured in the laboratory, methanol was used for extraction, and the yield was calculated as 16%. The seven phytochemicals were quantified by standard procedure, and the phenol was found maximum 96.7 µg/mg followed by alkaloid 89.5 µg/mg. The antibacterial activity was performed by disc diffusion method, and the maximum activity was noted against Salmonella typhi (19 mm) followed by Escherichia coli (12 mm). The antioxidant effect was recorded as concentration-dependent, and in all, the antioxidant effect was recorded in higher concentration level including as standards. In FT-IR spectral analysis, the active functional groups alkyl halide and amine were recorded simultaneously in 1H NMR analysis, 11 chemical shifts were recorded, and it revealed the stretching of alkane, allylic, benzylic, ketone, alkyne and esters. From the results, the present study concluded that S. platensis is an alternate source of pharmaceutical industry due to its phytochemical profile and bioactive potential.

The physical characteristics such as specific gravity, solidification point, saponification value, iodine, and acid value of liver oil were analyzed, and it has showed good characters similar to fish oil. The heavy metal was found in permissible limit, ash, and moisture was recorded in moderate level, protein, and carbohydrate were found as trace amount; the bad cholesterol was noticed lower and good cholesterol was high than fish oil. Ten fatty acids were recorded, the oleic acid, ω-3, EPA, DHA, and α- linolenic acid were recorded maximum level. The essential and non-essential amino acids were estimated and the fat soluble vitamins (A and E) were noticed higher level. The minerals Zn and Fe were found moderate level. The liver oil has showed antibacterial effect against 7 bacterial strains. The six antioxidant activities of liver oil have showed concentration depended. The Sepioteuthis lessoniana liver oil has showed against A549 cell lines.

The ash, moisture, protein and carbohydrate content of the extracted oil were estimated as 4, 7, 4 and 1% respectively. The Vitamins A and E was found to be 59.14 and 17.4 mg/100 g. Nine fatty acids were found and the Linoleic acid, DHA and EPA were recorded as higher. The specific gravity, solidification point, refractive index, saponification value, iodine value and acid value were also calculated and found as 1.056, 1.2 °C, 1.465 µ, 50.5, 20.4 mg and 0.075 mg KOH/g. The antioxidant activity that includes total antioxidant activity, DPPH & Hydroxyl radical scavenging assay, reducing power and ferrous ion chelating activity of liver oil was studied by following standard methods and results of all the assays was found increasing with increase in concentration. Further purification of liver oil and studying its antioxidant property in animal model shall form the basis for its use as a potent alternate natural antioxidant and nutrition supplements.

The chitin and chitosan of S. prashadi was prepared through demineralization, deproteinzation, deacetylation process and sulfation were carried by chlorosulfonic acid in N,N-dimethylformamide. The sulfate content in chitosan was found to be 18.9%. The carbon, hydrogen and nitrogen composition of the sulfated chitosan were recorded 39.09%, 6.95% and 6.58% respectively. The structural analysis was done by using FT-IR and NMR spectroscopy technique. The DSC curves of sulfated chitosan showed a large endothermic peak resolved with To value of 54.57°C and TP value of 97.46°C. The morphology of sulfated chitin and sulfated chitosan were studied by SEM. The Further in vitro antioxidant activity of sulfated chitosan was screened by scavenging activity of superoxide radical assay, hydroxyl radical scavenging assay, metal-ion chelating effect and reducing power. Its anticoagulant activity was tested for human plasma with respect to Activated Partial Thromboplastin Time (APTT) and Prothrombin Time (PT). Results prove that sulfated chitosan has potent antioxidant and anticoagulant activity.

Exopolysaccharide (EPS) designated as HMEPS was isolated from Halolactibacillus miurensis and purified through gel filtration chromatography. EPS extracted from the supernatant yielded a 56.1% total carbohydrate content. The ash and moisture content were 12.1% and 1.5% respectively. Galactose and glucose were found as main monosaccharides of the HMEPS through HPLC analysis. FT-IR spectra of the HMEPS revealed its composition with hydroxyl, alkenes, amide and carboxyl as functional groups and aliphatic amine and alkynes at the fingerprint region. In vitro antioxidant activity was investigated against hydroxyl, DPPH, superoxide free radicals and the scavenging activity against all were found to be dose dependent proportionately. HMEPS showed higher reducing ability against superoxide radical and potency in chelating the ferrous ions. 10mg/ml of HMEPS was found equivalent to 2.7units of ascorbic acid through the total antioxidant assay. Phylogenetic relation of H. miurensis SEEN MKU3 (GenBank number KT803852) was plotted with MEGA 5.0.

To evaluate the antioxidant potential of phosphorylated chitosan from the Sepioteuthis lessoniana gladius that is thrown as waste in seafood processing industries. Chitin was extracted from the gladius of S. lessoniana by demineralization and deproteinization. Chitosan was obtained by deacetylation of chitin in strong alkali and phosphorylated by using ortho-phosphoric acid. The structure of phosphorylated chitosan was elucidated through Fourier Transform Infra Red (FT-IR) spectroscopy. The antioxidant efficacy of phosphorylated chitosan was assessed through scavenging activity against 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid diammonium salt) (ABTS), 1, 1-diphenyl-2-picrylhydrazyl (DPPH), superoxide and hydroxyl radicals. The ability to chelate ferrous ion was also assessed. The yield and water solubility of phosphorylated chitosan was calculated as 81% and 78% respectively. The antioxidant activity of phosphorylated chitosan was found concentration dependent. The phosphorylated chitosan scavenges DPPH, ABTS, superoxide and hydroxyl radicals by 56.97%, 76.56%, 71.57% and 56.33% respectively and Inhibitory Concentration (IC50) values of scavenging those radicals were reported as 4.53, 0.46, 0.38 and 0.5 mg/ml, respectively. The chelating ability of phosphorylated chitosan was 59.56% with IC50 of 4.07 mg/ml. Moreover, the antioxidant activity of phosphorylated chitosan was compared with that of the standards such as Butylated Hydroxy Anisole (BHA), ascorbic acid, α-Tocopherol and Ethylene Diamine Tetra Acetic acid (EDTA). The results of the present investigation suggest that the phosphorylated chitosan with potent antioxidant property could be used as an alternative antioxidant that from a natural non-conventional source.