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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