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Ginseng saponins detected in the negative ion mode by LC-Q-TOF-MS analysis. (A) Total ion chromatogram (TIC) of selected standards, ginsenoside Rb1 and compound K. (B) TIC of American ginseng extract. Ginsenosides Re, Rc, Rb2/Rb3 and Rd are detected. (C) Chemical structures of ginsenoside Rb1 and compound K. Intestinal microbiota is critical in the biotransformation (Wan et al., 2013).
