Table III.

Antioxidant effects of positive controls expressed as a percentage of scavenged DPPH.

Curcumin		Quercetin		Ascorbic acid
Concentration (mM)	DPPH inhibition (%)	Concentration (mM)	DPPH inhibition (%)	Concentration (mM)	DPPH inhibition (%)
0.005	3.673	0.005	2.635	0.005	1.846
0.01	5.635	0.01	6.846	0.025	9.635
0.05	13.692	0.05	14.75	0.050	18.077
0.1	21.692	0.1	29.327	0.125	46.211
0.2	26.038	0.2	54.077	0.250	85.423
0.5	44.788	0.5	85.269	–	–
1	76.404	–	–	–	–

DPPH, 2,2-diphenyl-1-picrylhydrazyl.