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HPLC chromatogram of methanol extract of Rhizoma coptidis (A), ginger juice-processed Rhizoma coptidis (B), water-processed Rhizoma coptidis (C), and the mixture of reference substances (D). 1. Groenlandicine 2. Jatrorrhizine 3. Columbamine 4. Epiberberine 5. Coptisine 6. Palmatine 7. Berberine.
