Abstract
Phytochemical examination of the peel of grapefruit resulted in the isolation of five compounds namely friedelin, β -sitosterol, 7(3’,7’,11’,14’-tetramethy)pentadec-2’,6’,10’-trienyloxycoumarin, limonin and cordialin B. These compounds have been characterized on the basis of spectral data, and 7(3’,7’,11’,14’-tetramethy)pentadec-2’,6’,10’-trienyloxycoumarin is a hitherto unreported compound.
Highlights
First-derivative spectrophotometric determination of pyridoxine hydrochloride in pharmaceutical preparations
MS suggested its molecular mass to be 422. 1H NMR of the compound in CDCl3 showed a doublet at δ 7.64 (J 10 Hz) which was typical of H-4 of a coumarin
Summary
First-derivative spectrophotometric determination of pyridoxine hydrochloride in pharmaceutical preparations. Simultaneous determination of ascorbic acid, pyridoxine hydrochloride, and tyrosine by derivative UV spectrophotometry.
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