Analyses of Total Alkaloid Extract of Corydalis yanhusuo by Comprehensive RP × RP Liquid Chromatography with pH Difference

Figure 1

Analysis of alkaloid standards with different pH conditions. ((a) pH = 10.5; (b) pH = 3.0). (c) The scattering of alkaloid standards retention times with different pH conditions. The -axis denotes the separation under pH 3.0, and the -axis is the separation under pH 10.5. All chromatograms were recorded under 280 nm using a photodiode array detector.

(a)

(b)

(c)