Simultaneous Determination of Three Coumarins in Angelica dahurica by ¹H-qNMR Method: A Fast and Validated Method for Crude Drug Quality Control

Table 4

Recovery (%) of the coumarins in A. dahurica by the using the ¹H-qNMR method.

Component	Content for the sample (mg)	Standard addition (mg)	Experimental value (mg)	Recovery (%)	Average recover (%)	RSD (%)
Imperatorin	1.214	1.217	2.422	99.297	97.504	1.300
	1.214	1.217	2.406	97.952
	1.214	1.217	2.406	97.952
	1.214	1.217	2.373	95.263
	1.214	1.217	2.373	95.263
	1.214	1.217	2.406	97.952
Byakangelicin	0.675	0.700	1.377	100.263	98.817	1.463
	0.675	0.700	1.356	97.371
	0.675	0.700	1.356	97.371
	0.675	0.700	1.377	100.263
	0.675	0.700	1.356	97.371
	0.675	0.700	1.356	97.371
Oxypeucedanin	0.968	1.000	1.907	93.904	93.038	0.932
	0.968	1.000	1.889	92.171
	0.968	1.000	1.907	93.904
	0.968	1.000	1.889	92.171
	0.968	1.000	1.889	92.171
	0.968	1.000	1.924	95.638