Table 3.

Antioxidant activity and linear range of different concentrations.

Samples	Linear range (μg/mL) a	DPPH (IC50, μg/mL) a
Crude ethanol extract (CEE)	14.62-467.84	142.50 ± 4.62
Crude flavonoid extract (CFE)	14.62-467.84	94.23 ± 2.23
Quercetin-3-O-robinobioside (1)	11.73-375.36	99.06 ± 2.32
Rutin (2)	20.33-325.28	105.44 ± 2.61
Quercetin-3-O-β-D-glucoside (3)	9.31-297.92	69.13 ± 2.03
Kaempferol-3-O-robinobioside (4)	29.34-469.44	191.67 ± 5.09
Kaempferol-3-O-rutinoside (5)	29.34-469.44	188.59 ± 4.14
L-Ascorbic acid b	1.63-26.08	12.92 ± 0.32

^aEach value is presented as mean ± SD (n = 3); ^bUsed as positive control.