Simultaneous determination of oleanolic acid and ursolic acid by RP-HPLC in the leaves of Eriobotrya

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Oleanolic acid(OA) and ursolic acid(UA) are isomeric triterpenic acids and only one methyl's position is different between them.OA and UA always exist in the same plant,so it is difficult to separate them when determining contents by RP-HPLC.In this s
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