Research Article
The Liquid Chromatographic Determination of Chlorogenic and Caffeic Acids in Xu Duan (Dipsacus asperoides) Raw Herb
Table 3
Comparison of intensities of the qualifier ion(s) for chlorogenic acid (m/z 85) and caffeic acid (m/z 89, 135) obtained for the standard and raw herb.
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aAverage calculated from 5 replicates. bRelative difference (absolute difference/relative intensity of standard) × 100. cMaximum permitted tolerance of the European Union guidelines [11]. |