Fig. 3.

MALDI-MSI distinguishing ginseng of different ages based on the localization of ginsenosides (Bai et al., 2016) A. (a) Optical scan image of ginseng. (b) Overlay of ion images: red, m/z 805.5 (Rg8/Rk/Rz₁); yellow, m/z 955.6 (unidentified); blue, m/z 917.8 (unidentified). (c–g) Five localization modes of signals: xylem-medulla type (c1 and c2); xylem-only type (d1 and d2); cork-xylem type (e1 and e2); cork-phloem-cambium-medulla type (f1 and f2); and cork-only type (g1 and g2). B. PCA score plot and 2D peak distribution plot of m/z 1117.5 and m/z 1147.5: a and c, whole tissue; b and d, cork. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)