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Table 4 HPLC fractions of flavonoid content of V. geminata, P. pyrenoidosa, B. eriensis, and S. obliquus

From: Antioxidant activities of some edaphic algae in Egypt

Flavonoids Chemical structure V. geminata P. pyrenoidosa B. eriensis S. obliquus Retention time
Catechin Proanthocyanidins 2.13 2.32 ND 2.55 1.5
Kaempferol Flavonols 3.15 3.77 ND ND 2.9
Rutin Flavonols 2.70 4.13 2.92 3.54 3.7
Quercitrin Flavonols 3.22 4.52 4.25 3.97 4.1
Hesperetin Flavanones 1.45 2.46 2.46 ND 4.9
Apigenin Flavones 1.96 3.71 3.70 2.58 5.8
Quercetin Flavonols 3.34 3.50 2.26 3.99 6.5