Table 3.

Correlations between the EC₅₀ values of antioxidant activities and phenolic and flavonoids content of C. opaca leaves

Assays	Correlation R2
	Phenolics	Flavonoids (ns)
EC50 of DPPH radical scavenging ability	0.1774ns	0.5133
EC50 of superoxide radical scavenging ability	0.628a	0.1421
EC50 of antioxidant capacity	0.175ns	0.3276
EC50 of hydroxyl radical scavenging ability	0.4215ns	0.3649
EC50 of hydrogen peroxide radical scavenging ability	0.3411ns	0.1284
EC50 of ABTS radical scavenging ability	0.0033ns	0.2154
EC50 of β-carotene bleaching inhibition	0.1191ns	0.0953
EC50 of chelating power	0.0084ns	0.0079

C. opaca leaves methanol extract and its soluble fractions were used in the correlation

Significantly different depicts that a (p < 0.05), ns (non-significant)