Fig. 4.

Analysis of the metabolites in the yellow-flesh sweetpotato treated by different cooking methods. (A) The PCA score plots, each dot represents an independent experimental repeat. (B) The PCA loading plots, each dot represents an identified metabolite. (C) Heatmap visualization of all the metabolites. The red blocks indicate the up-regulated metabolites, blue blocks indicate down-regulated metabolites, white blocks represent the average relative expressed intensity of all metabolites. (D) K-means analysis for all metabolites.