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Direct analysis of alkaloids in the tissues of crude and processed Strychnos nux-vomica seeds by MALDI-TOFMS was described. The alkaloid profiles of the herb drugs were obtained without the need of complicated sample preparation to avoid potential damage or change of the active components. Seed tissues that were optimally sliced to a thickness of 10–20μm from the crude and processed Strychnos nux-vomica...
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