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Abstract

Total phenol, flavonoid, carotenoid and antioxidant activity of four green macroalgae (Halimeda tuna, Halimeda macroloba, Enteromorpha sp. and Acetabularia acetabulum) collected from South Andaman coast were analysed in this study. The results revealed that methanol extract of Enteromorpha sp. showed maximum phenolic, flavonoid and carotenoid content of 5.72±0.13 mg GAE/g, 21.15±1.05 mg RE/g and 47.78±0.46 µg/g respectively. All the analysed macroalgae species exhibited antioxidant activities in dose dependent manner among which Enteromorpha sp. demonstrated greater antioxidant potential. A. acetabulum exhibited greater ABTS (2, 2-azinobiz-3-ethylbenthiazoline-6-sulfonic acid) radical scavenging ability (92%) as evident by its low IC 50 (6.30 mg/ml) in comparison to other species. Based on factor analysis, up to two principal components were chosen to explain variability in 10 independent phytochemicals. The antioxidant potential reveals their potential for future applications in medicine, dietary supplements as well as the natural source of immunostimulants.

Nutrient Composition, Antioxidant and Antibacterial Activities of Ulva prolifera O. F. Müller

“…Polyphenols are capable of scavenging DPPH by electron donation or hydrogen atom provision and transforming it to a colorless product (2, 2-diphenyl-1-hydrazine), causing a decrease in optical density of the sample extract at 517 nm (Liu et al, 2018;Sivaramakrishnan et al, 2017). As the result obtained in ABTS + antioxidant activity assay, the scavenging activity against DPPH free radical also increased when the concentration of U. prolifera extract (10-50 g/ mL) increases (Table 4).…”

“…A r t i c l e i n P r e s s such as Halimeda tuna (IC 50 16.1 ug/mL) and Acetabularia acetabulum (IC 50 6.3 ug/mL), U. prolifera had a comparatively potent antioxidant activity (Sivaramakrishnan et al, 2017). The results suggested that U. prolifera extract may contain phenolic compounds that serve as antioxidants capable of inhibiting oxidation through free radical scavenging activity.…”

“…ABTS + antioxidant assay is an excellent method in determining the antioxidant property of chain-breaking antioxidants (lipid peroxyl radical scavenger) and natural antioxidants capable of hydrogen donation (aqueous phase radical scavenger) (Liu et al, 2018;Sivaramakrishnan et al, 2017). The ABTS + scavenging activity and IC 50 value of U. prolifera extract is shown in Table 3.…”

“…The demand of human society for a healty lifestyle and increased longevity has led people (consumers) to consume functional foods with plentiful sources of chemical compounds and other nutraceuticals. Of these well-known natural foods, seaweeds are considered as one of the most valuable natural resources for macronutrients (carbohydrates, proteins and lipids), micronutrients (vitamins and minerals), and other significant chemical substances for animal and human health (Corsetto et al, 2020;Cotas et al, 2020;Arguelles, Monsalud, & Sapin, 2019;Arguelles, Laurena, Monsalud, & Martinez-Goss, 2018;Sivaramakrishnan et al, 2017). Recent studies shows that several unique compounds from seaweeds, such as acrylic acid, brominated phenols, heterocyclic carbons, polysaccharides, terpenes, peptides, chlorophyllides and sterols, were isolated and being developed as new active ingredients for pharmaceuticals (Cotas et al, 2020;Yuan et al, 2018;Yaich et al, 2011).…”

“…Recent studies shows that several unique compounds from seaweeds, such as acrylic acid, brominated phenols, heterocyclic carbons, polysaccharides, terpenes, peptides, chlorophyllides and sterols, were isolated and being developed as new active ingredients for pharmaceuticals (Cotas et al, 2020;Yuan et al, 2018;Yaich et al, 2011). These substances have diverse biological and chemical activities like antimicrobial, anticancer, anti-diabetic, anti-inflammatory, antioxidant and anti-hypertensive properties that can be used to discover novel drugs for pharmaceutical application (Kordjazi, Etemadian, Shabanpour, & Pourashouri, 2019;Sivaramakrishnan et al, 2017).…”