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Extracted ion chromatograms for ginsenoside Rs1 ([M–H]−, m/z 1119.5), a potential characteristic marker to differentiate P. ginseng and P. quinquefolium. The chromatograms for 20 batches of P. ginseng and 20 batches of P. quinquefolium samples are shown. W and R refer to air-dried and steamed P. ginseng (white and red ginseng), respectively; Q refers to P. quinquefolium.
