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Jelodar Nasseri N, Farasat M, Tadayoni M. Phytochemical profiling and antioxidant activity of aqueous, methanolic and ethanolic extracts of selected macroalgae from the Persian Gulf. Wetland Ecobiology 2026; 18 (4) : 2
URL: http://jweb.ahvaz.iau.ir/article-1-1141-en.html

Numerous macroalgae have been identified in the waters of the Persian Gulf, some of which have high nutritional value and are used in the pharmaceutical and health industries and other applications. In this study, 5 species of macroalgae, including 2 brown, 2 green and 1 red species, were collected from the northern coasts of the Persian Gulf in Bushehr province and their aqueous, ethanolic and methanolic extracts were evaluated for antioxidant activity. Antioxidant activity was measured by DPPH radical scavenging method and IC50 determination. Total phenol was measured using Folin-Ciocalteau reagent with a tannic acid standard curve and total flavonoids were measured by colorimetric method and with a quercetin standard curve. The results showed that different species differ significantly in terms of antioxidant activity, contents of total phenolics, flavonoids and anthocyanins. The highest antioxidant capacity with the lowest IC50 value of 0.350±0.040 mg/ml and, the highest amount of phenols and flavonoids were observed in the methanolic extract of green alga Ulva flexuosa. Among the studied species, the brown alga Padina tetrastromatica showed the highest amount of anthocyanin. There was a significant negative correlation between IC50 and total phenolics and between IC50 and total flavonoids, and a significant positive correlation was observed between the amount of phenolics and flavonoids at the 0.01 level. There was also a significant negative correlation between IC50 and anthocyanin, and a significant positive correlation between flavonoids and anthocyanin.