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Antioxidant potential of three brown seaweeds,Anthophycus longifolius, Sargassum plagiophyllum, andSargassum myriocystum, obtained from the Gulf of Mannar region of India were evaluated utilizing differentin vitrosystems. Ethyl acetate (EtOAc) fraction ofAnthophycus longifoliusregistered significantly greater hydroxyl radical scavenging ability (IC500.19 mg/mL) and was effective in stabilizing the 2,2′-azino-bis-3-ethylbenzothiozoline-6-sulfonic acid (IC501.23 mg/mL) and 1,1-diphenyl-2-picryl-hydrazil (DPPH) radicals (IC500.48 mg/mL) (p< 0.05). No significant differences in hydrogen peroxide (H2O2) scavenging and ferrous ion chelating properties of the EtOAc extracts of the seaweeds were apparent. The utilities of the reverse-phase high-performance liquid chromatography (RP-HPLC) method hyphenated to diode-array detection for analyzing the fingerprints of phenolic constituents in the solvent extracts and fractions of the seaweeds were denoted. High-performance liquid chromatographic analysis indicated the presence of phenolic acids in the solvent extracts of seaweeds. This study demonstrated the potential use ofA. longifoliusas candidate species to be used as a nutritional food supplement/functional foods to increase the shelf life of food items for human consumption. [ABSTRACT FROM AUTHOR]

Recently a great deal of interest has been developed towards natural bioactive components from seaweeds as functional food ingredients. Antioxidant, anti-inflammatory, antidiabetic, and antihypertensive activities of ethyl acetate:methanol and chloroform solvent fractions of the brown seaweedSargassum wightiiwere evaluated using differentin vitrosystems. The ethyl acetate:methanol fraction registered greater Fe2+ion chelating ability (IC500.52 mg/ml), and were effective in stabilizing the 2,2-azino-bis-3-ethylbenzothiozoline-6-sulfonic acid (IC500.82 mg/mL), and 1,1-diphenyl-2-picryl hydrazil radicals (IC500.32 mg/mL) than those derived from chloroform solvent fractions. The chloroform solvent fraction showed greater angiotensin converting enzyme-I inhibitory activity (IC500.084 mg/mL), while the ethyl acetate:methanol fraction exhibited greater anti-COX-1, 2, and 5-LOX (IC500.03-0.05 mg/mL) and DPP-4 inhibitory (IC50~ 0.013 mg/mL) properties. A significant co-linearity was recorded between target bioactive properties and the electronegative groups appeared in the downfield space of the nuclear magnetic resonance spectra of the ethyl acetate:methanol and chloroform solvent fractions fromS. wightii. [ABSTRACT FROM AUTHOR]