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

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

Sample	DPPH		Nitric oxide		Reducing power		Hydrogen peroxide
	IC₅₀ ^a	R^{2 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

a: IC₅₀ is defined as the concentration (μg/ml) sufficient to obtain 50% of a maximum scavenging capacity.
b: coefficient of determination; values obtained from regression lines with 95% confidence level.
-: Values not determined

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