Abstract

The occurrence of free and glycosidic vitamin D 3 and its metabolises in Cestrum diurnum leaves was investigated. The chloroform extract of the leaves (containing free vitamin D 3 and its metabolites) and the chloroform-methanol (1:2) extract (containing glycosidic vitamin D 3 and its metabolites) of the residue after glycosidase treatment were partially purified by column chromatography. Fractions corresponding to authentic vitamin D 3, 25-hydroxy vitamin D 3 (25-OH-D 3) and 1,25-dihydroxy vitamin D 3 (1,25-(OH) 2D 3) were found to be biologically active. These fractions were also analysed and quantified by HPLC. This is the first demonstration of the presence of free vitamin D 3, 25-OH-D 3 and 1,25-(OH) 2D 3 in a carcinogenic plant. Apart from the free forms, the corresponding glycosidic metabolites were also found. The concentration of free metabolises was much higher than that of the glycosidic forms.

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