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The principal components, isoflavonoids and astragalosides, in the extract of Radix Astragali were detected by a high-performance liquid chromatography couple to electrospray ionization ion trap multiple-stage tandem mass spectrometry (HPLC-ESI-IT-MS n ) method. By comparing the retention time (t R ) of HPLC, the ESI-MS n data and the structures of analyzed compounds with the...
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