Metal Chelating and Cupric Ion Reducing Antioxidant Capacities of Ammoides atlantica Aqueous Extract
Reactive oxygen (ROS) and nitrogen species (RNS) are produced in all cells and play important roles in physiology. The loss of the redox balance, either by an increase of oxidant molecules ROS and RNS or by decreased antioxidant system activities cause a state of oxidative stress. Several studies are going on worldwide directed towards finding natural antioxidants of plant origin. Plants containing phenolic compounds have been reported to possess strong antioxidant activity. The objective of this study is to evaluate total polyphenols and flavonoids contents (TPC and TFC) as well as examine the in vitro antioxidative properties from aqueous extract of Ammoides atlantica (AqE). TPC was estimated utilizing Folin-Ciocalteu's reagent. TFC was evaluated utilizing the aluminum chloride method. The antioxidant properties were evaluated using metal chelating and cupric ion reducing antioxidant capacity (CUPRAC) assays. Indeed, results showed that the AqE is rich in polyphenols (141.74±0.44 µg gallic acid equivalents/ mg of dry weight), and flavonoids (61.87±6.7 µg quercetin equivalent/ mg dry weight). These phytochemical compounds possess significant antioxidant activities. The results showed that AqE exhibited a good Metal chelating activity with an IC50 of 36.57±4.73 µg/ mL. CUPRAC assay showed that AqE extract exhibited high cupric ion reducing antioxidant capacity with an A0.5 of 8.58±0.13 µg/mL. These findings provide evidence that AqE of Ammoides atlantica is a potential source of antioxidant which have many benefits towards human health.
Keywords: Ammoides atlantica, aqueous extract, phenolic compounds, metal chelating and cupric ion reducing antioxidant capacity.
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