Table 3.

DPPH-scavenging activity and FRAP of compounds 7–11.

Compound	DPPH-Scavenging Effect	FRAP
	SC50 µM, 30 min	mol (Fe2+)/mol (polyphenolic compound X)
Quercetin	8.9 ± 0.2	5.11 ± 0.31
Ascorbic acid	30.5 ± 2.1	3.43 ± 0.33
1	24.3 ± 3.7 *	1.78 ± 0.16 ***
2	25.0 ± 2.2 **	1.31 ± 0.02 **
3	23.7 ± 2.1 **	1.60 ± 0.08 **
4	18.0 ± 0.2 ***	2.78 ± 0.18 **
5	26.1 ± 3.0 *	0.86 ± 0.04 *
6	21.8 ± 2.0 *	1.43 ± 0.06 **
7	25.7 ± 3.4 *	1.83 ± 0.16 *
8	26.7 ± 3.8 *	1.95 ± 0.19 *
9	13.5 ± 1.2 **	0.75 ± 0.05 **
10	22.7 ± 3.5 *	1.75 ± 0.20 *
11	19.4 ± 2.2 **	1.45 ± 0.08 **

¹ Data are presented as the mean ± SEM, n = 3. *** p < 0.001, ** p < 0.005, and * p < 0.05 compared to quercetin. ² Data for compounds 1–6 have been previously published in [24].