Isolation and Identification of Antioxidant Compounds from Gynura Bicolor Stems and Leaves

Figures & data

FIGURE 1 Compounds 1–12 from G. bicolor stems and leaves.

FIGURE 2 DPPH and ABTS radical scavenging capacity of different polar fractions at 5 mg/mL: XJ (XY) for stems (leaves) extract; XJA (XYA), XJB (XYB), XJC (XYC), XJD (XYD) for stems (leaves), separately representing petroleum ether, EtOAc, n-BuOH, and water fraction.

FIGURE 3 DPPH and ABTS radical scavenging capacity of fractions (XJB, XYB, and their corresponding fractions separated by Sephadex LH-20) at 1 mg/mL.

TABLE 1 Scavenging effects (IC₅₀) on DPPH and ABTS of compounds 1–12.

Compounds	IC50 (mM)
	DPPH	ABTS
1	0.82	1.39
2	0.62	0.51
3	0.44	0.49
4	0.33	0.66
5	65.3%^a	0.72
6	56.0%^a	0.78
7	1.22	1.38
8	0.83	0.61
9	35.6%^a	44.3%^a
10	50.0%^a	74.0%^a
11	67.5%^a	66.6%^a
12	0.58	0.51
Vitamin C	0.57	0.51

^aRadical scavenging effect at 1 mg/mL.