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[Determination of content of iridoids and flavonoids in Tibetan medicine "Lanhua Longdan" by quantitative analysis of multi-components by single marker (QAMS)].

In this study, the content of iridoids and flavonoids in Tibetan medicine "Lanhua Longdan" was determined simul-taneously by quantitative analysis of multi-components by single marker(QAMS), which was used to verify the feasibility and applicability of the method in the application of Lanhua Longdan quality evaluation. Using HPLC with two typical elements gentiopicroside and isoorientin as the internal reference, the relative correction factor(RCF) between the mand loganin acid, swertiamarin, sweroside, isoscoparin-2″-β-D-glucopyranoside and isoscoparin was determined and then used, to calculate the content of several other components to achieve QAMS. At the same time, the external standard method(ESM) was used to determine the contents of these 7 components in the medicinal materials, and the differences were compared to verify the accuracy and feasibility of QAMS. The results showed that the RCF repeatability is good. There were no significant differences in the determination results of the contents of 12 batches of 4 varieties of Tibetan medicine Lanhua Longdan obtained by QAMS and ESM. Therefore, the QAMS can be used for the quality evaluation of Lanhua Longdan, and provides a reference for the quality evaluation of multi-index components of Lanhua Longdan. The results showed that the content of iridoid and flavonoid in the dried product should not be less than 0.6% and 0.8% respectively.