Chemical constituents of Clinacanthus siamensis leaves

Abstract

Investigation of the chemical constituents from the methanol extract of Clinacanthus siamensis Brem. leaves led to the isolation of glycoglycerolipids as the peracetyl derivatives. Structure elucidation and identification of the isolated compounds were mainly determined by spectroscopic data analysis especially 1D and 2D-NMR, comparison with previously reported data, together with analysis of gas chromatograms of fatty acid methyl esters from acid and enzymatic hydrolysis. The glycoglycerolipids are one mixture of monogalactopyranosyl diglycerides and two mixtures of digalactopyranosyl diglycerides. The acyl groups of the glycoglycerolipids are hexadecanoic acid (16:0), hexadecaenoic acid (16:1), octadecanoic acid (18:0) and octadecatrienoic acid (18:3). In addition, a mixture of beta-sitosterol-3-O-glucoside and beta-stigmasterol-3-O-glucoside is also isolated