Antioxidative Activities and Active Compounds of Extracts from Catalpa Plant Leaves

Table 2

The total flavonoid contents and antioxidant activity of crude extract from leaves of clones of C. bungei C. A. Mey.

Clones	Total flavonoids mg/g·DW	Reducing power %	DPPH radical scavenging activity IC50 mg/mL	Hydroxyl radical scavenging activity IC50 mg/mL
CA2	34.62 ± 0.319^b	27.49 ± 0.080^b	1.97 ± 0.004^b	0.10 ± 0.001^b
CA5	32.17 ± 0.353^c	26.58 ± 0.139^c	2.23 ± 0.008^a	0.15 ± 0.001^a
CA6	46.29 ± 0.245^a	41.61 ± 0.080^a	0.98 ± 0.008^c	0.08 ± 0.001^c

ANOVA. Different letters within each column indicate the statistical difference according to post hoc comparison (Student Newman Keuls) at .