Antioxidative Activities and Active Compounds of Extracts from Catalpa Plant Leaves

Table 1

The total flavonoid contents and antioxidant activity of crude extracts from the leaves of Catalpa plants.

	Total flavonoids mg/g·DW	Reducing power; %	DPPH radical scavenging activity; IC50 mg/mL	Hydroxyl radical scavenging activity; IC50 mg/mL
C. ovata G. Don	29.08 ± 0.157^c	21.65 ± 0.080^c	2.35 ± 0.009^a	0.58 ± 0.011^a
C. fargesii Bur.	32.52 ± 0.102^b	24.05 ± 0.105^b	2.01 ± 0.006^b	0.13 ± 0.001^b
C. bungei C. A. Mey.	40.45 ± 0.143^a	34.10 ± 0.100^a	1.73 ± 0.003^c	0.11 ± 0.001^c

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