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Table 3 HPLC fractions of phenol content of V. geminata, P. pyrenoidosa, B. eriensis, and S. obliquus

From: Antioxidant activities of some edaphic algae in Egypt

Phenols Chemical structure V. geminata P. pyrenoidosa B. eriensis S. obliquus Retention time
Gallic Benzoic derivative 3.40 4.11 3.62 3.44 1.9
Resorcinol Benzoic derivative 3.66 4.73 3.95 ND 2.5
Chlorogenic Cinnamic derivative 2.91 3.42 1.90 3.09 3
Caffeic Cinnamic derivative 3.35 3.94 4.22 3.42 3.4
Coumaric Cinnamic derivative 4.52 4.45 ND 2.25 4.2
Ferulic Cinnamic derivative 4.02 3.30 3.11 3.21 5.1
Syringic Benzoic derivative 2.11 2.28 ND 1.33 8