Table 1.

IC₅₀ and maximum activity of DPPH free radical scavenging of standard antioxidants and the hydroethanolic extract of C. americana L. leaves (ExC).

Treatment	IC50 (µg·mL−1)	n ∗	Maximum activity
			%	µg·mL−1
Ascorbic acid	1.8 ± 0.4	2	92.3 ± 0.8	10
BHT	18.3 ± 4.5	2	93.7 ± 1.3	500
ExC	6.0 ± 0.5	3	96.5 ± 1.2	25

  ^∗ n = number of independent experiments in triplicate. BHT = butylhydroxytoluene.