The Liquid Chromatographic Determination of Chlorogenic and Caffeic Acids in Xu Duan (Dipsacus asperoides) Raw Herb

Table 2

Recoveries for chlorogenic acid and caffeic acid in the Xu Duan.

Compound	%recovery ± %RSD^a
	Chlorogenic acid			Caffeic acid
	50% spike	100% spike	200% spike	50% spike	100% spike	200% spike
Raw herb	98.76±2.4	96.31±2.4	104.56±3.6	80.52±9.6	88.26±3.6	92.85±6.7

 ^aMean recovery ± %RSD calculated from 7 replicate extractions and analyses.