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

Figure 3

(a) A 2D contour plot of offline comprehensive two-dimensional separation of total alkaloids extract of Corydalis yanhusuo. The top chromatograms denote separation with pH 3.0, and the right chromatograms denote separation with pH 10.5. (b) 3D demonstration of two-dimensional separation chromatogram. The -axis is the retention time with pH 3.0, the -axis is the retention time with pH 10.5, and the -axis is the absorption at 280 nm.

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