Table 4.

DPPH radical-scavenging activities of the isolated compounds from sword beans

Compounds	DPPH radical-scavenging activities (%)
1	85.6 ± 3.6a
2	4.1 ± 1.7e
7	90.6 ± 5.5a
8	10.2 ± 2.1d
9	15.9 ± 2.4c
10	10.8 ± 2.2d
11	9.3 ± 2.4d
12	15.6 ± 3.2c
15	14.4 ± 2.6c
16	14.1 ± 1.4c
17	13.2 ± 2.8c
18	13.8 ± 2.5c
Ferulic acid	71.3 ± 2.3b

Ferulic acid was used as positive control. The isolated compounds except for 3–6, 13, and 14 were assayed at the concentration of 50 μM. Values are expressed as mean ± SD (n = 3)

^a–eResults with a different letter differ significantly (p < 0.05)