Simultaneous Determination of Catalpol, Aucubin, and Geniposidic Acid in Different Developmental Stages of Rehmannia glutinosa Leaves by High Performance Liquid Chromatography

Table 2

Elution time of three analytes under different concentrations of ACN.

% of ACN	Rt (min) of CA	Rt (min) of AU	Rt (min) of GPA
1%	13.651	22.131	31.184
2%	7.898	11.408	23.006
3%	4.361	7.023	14.070
5%	3.436	4.941	9.943
7%	≤Rt0	3.427	8.677
10%	≤Rt0	≤Rt0	6.181

Note: Rt0 represents solvent peak, about 3.13~3.17.