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Table 1 Scavenging activity of P. viridiflorum (bark) and G. bicolor (leaf) acetone extracts

From: Phytochemical studies and antioxidant activity of two South African medicinal plants traditionally used for the management of opportunistic fungal infections in HIV/AIDS patients

Sample DPPH Nitric oxide Reducing power Hydrogen peroxide
  IC50 a R2 b IC50 R2 IC50 R2 IC50 R2
P. viridiflorum 0.22 95.70 0.16 39.10 0.26 83.20 0.13 89.90
G. bicolor 0.27 91.80 0.22 93.60 0.27 99.90 0.23 92.20
Vitamin C 0.05 73.90 0.24 96.10 0.22 92.40 0.29 92.50
Rutin 0.08 30.50 0.25 99.30 - - - -
BHT - - - - 0.23 95.90 - -
Gallic acid - - - - - - 0.15 55.90
  1. a: IC50 is defined as the concentration (μg/ml) sufficient to obtain 50% of a maximum scavenging capacity.
  2. b: coefficient of determination; values obtained from regression lines with 95% confidence level.
  3. -: Values not determined