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Chemical study of the leaves of Lagerstroemia speciosa in Vietnam

Tran Van Loc, Nguyen Thi Ngan, Pham Thi Ninh, Tran Thi Phuong Thao, Nguyen Thi Luu, Le Thi Thu Ha, Nguyen Minh Thu, Nguyen Thi Van Anh, Tran Van Sung

Abstract


The main constituents of the EtOH extract of leaves of Lagerstroemia speciosa supplied by Traphaco company have been quantitatively determined by HPLC to be corosolic acid (2.242 %), asiatic acid (1.219 %) and β-sitosterol. Repeated column chromatography of the n-hexane, ethyl acetate and dichloromethane extract of these leaves led to the isolation of corosolic acid, asiatic acid, quercetin, β-sitosterol and β-sitosterol-3-O-β-D-glucopyranosyl glucoside. The structures of these compounds have been elucidated by the IR, MS and NMR spectral analysis.


Keywords


Lagerstroemia speciosa, leaves, quercetin, corosolic acid, asiatic acid

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