Potential Antioxidant Anthraquinones Isolated from Rheum emodi Showing Nematicidal Activity against Meloidogyne incognita

Table 1

IC₅₀ (mg/L) and DPPH scavenging activity (%) of Rheum emodi (rhubarb) extracts.

Compound	% DPPH scavenging activity				, (3d.f, 95%)	Regression equation	Fiducial limit	IC50; (mg/L)
	5 mg/L	10 mg/L	50 mg/L	100 mg/L
CE1	20.12	38.75	70.12	87.95	1.14		14.69–22.73	18.28
CE2	21.56	32.71	68.52	88.33	5.94		15.66–23.97	19.37
CE3	19.80	35.47	68.41	85.59	0.971		16.25–25.28	20.27
Quercetin hydrate	43.38	67.17	87.78	91.41	5.59		3.12–7.14	4.95
Gallic acid	31.79	44.64	85.06	92.43	2.96		8.73–14.54	11.26

Results shown are means of three experiments.