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Chemical Constituents of Flavoids from Uncaria sinensis

Xiaopo Zhang

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Abstract

OBJECTIVE To study the chemical constituents of flavones from Uncaria sinensis.METHODS The extract with 95%EtOH from the bard and branch with curved hooks of U.sinensis.was sequentially partitioned with petroleum ether,CHCl3,EtOAc and n-BuOH,respectively.Five flavones were isolated by column chromatography from EtOAc and n-BtOH parts,and their structures were identified by the spectral analysis of NMR and MS data.RESULTS Five flaveones were isolated and their structures were identified as: quercetin(1),kaempferol(2),linarin(3),quercetin-3-O-β-D-galactopyranside(4),quercetin-3-O-α-L-rhamnopyranosyl-(1→6)-β-D-galactopyranoside(5).CONCLUSION Compounds 1-5 were obtained from this plant for the first time.

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OBJECTIVE To study the chemical constituents of flavones from Uncaria sinensis.METHODS The extract with 95%EtOH from the bard and branch with curved hooks of U.sinensis.was sequentially partitioned with petroleum ether,CHCl3,EtOAc and n-BuOH,respectively.Five flavones were isolated by column chromatography from EtOAc and n-BtOH parts,and their structures were identified by the spectral analysis of NMR and MS data.RESULTS Five flaveones were isolated and their structures were identified as: quercetin(1),kaempferol(2),linarin(3),quercetin-3-O-β-D-galactopyranside(4),quercetin-3-O-α-L-rhamnopyranosyl-(1→6)-β-D-galactopyranoside(5).CONCLUSION Compounds 1-5 were obtained from this plant for the first time.

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Available abstract

OBJECTIVE To study the chemical constituents of flavones from Uncaria sinensis.METHODS The extract with 95%EtOH from the bard and branch with curved hooks of U.sinensis.was sequentially partitioned with petroleum ether,CHCl3,EtOAc and n-BuOH,respectively.Five flavones were isolated by column chromatography from EtOAc and n-BtOH parts,and their structures were identified by the spectral analysis of NMR and MS data.RESULTS Five flaveones were isolated and their structures were identified as: quercetin(1),kaempferol(2),linarin(3),quercetin-3-O-β-D-galactopyranside(4),quercetin-3-O-α-L-rhamnopyranosyl-(1→6)-β-D-galactopyranoside(5).CONCLUSION Compounds 1-5 were obtained from this plant for the first time.

Key concepts: Flavones, Petroleum ether, Chemical constituents, Quercetin, Chemistry, Kaempferol, Column chromatography, Chromatography

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