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KMID : 1200820090090020200
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Oriental Pharmacy and Experimental Medicine
2009 Volume.9 No. 2 p.200 ~ p.205
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Secondary metabolites (Triterpenes) from Couroupita guianensis
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Begum Rokeya
Rahman Mohammad S
Chowdhury A M Sarwaruddin
Hasan Choudhury M
Rashid Mohammad A
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Abstract
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The n-hexane and carbon tetrachloride soluble fractions of a methanolic extract of the stem bark of the Couroupita guianensis furnished three compounds, identified as -amyrin (1), betulin--caffeate (2) and lupeol--caffeate (3). The structures of the isolated compounds were deduced by extensive spectroscopic analysis as well as by comparison with published values. Compounds 1-3 were subjected to antioxidant screening through free radical scavenging activity by DPPH (1,1-diphenyl-2-picrylhydrazyl), where compound 2 showed moderate antioxidant activity with value .
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KEYWORD
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Couroupita guianensis, Lecythidaceae, -amyrin, Betulin--caffeate, Lupeol--caffeate
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