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

Table 1

Mobile phase composition for the HPLC analysis of Xu Duan.

Time (min)	0.1% aqueous formic acid	% methanol
0	82	18
10	72	28
15	70	30
15.5	5	95
25	5	95
25.5	82	18
35	82	18

Note: the flow rate was 1 mL/min.