Table 2. Antioxidant, total phenol and flavonoid contents of P. wilhelmsiana.

Extract or fractions	Total phenol content (as gallic acid equivalents) mg g- 1	Flavonoid content mg g- 1	Antioxidant activitya (RC50; mg mL-1 )
Total extract	12.18	35.60	00.15
10%	09.17	01.55	03.82
20%	17.52	00.00	00.18
40%	19.31	154.14	0.017
60%	18.43	176.60	00.0740
80%	11.32	00.00	00.1774
100%	09.84	00.00	01.0192

^aPositive control(quercetin): 2.92 x 10^-5