Author(s): Novotny L, AbdelHamid ME, Hamza H, Masterova I, Grancai D
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Abstract Ursolic acid is a hydroxy pentacyclic triterpene, which has a chemoprotective activity in human. A reliable and reproducible liquid chromatography-mass spectrometric assay (LC-MS) was developed for the determination of ursolic acid in laboratory-made mixtures and in leaves and twigs extracts of Staphylea holocarpa Hemsl. The methanolic solution of the extracted ursolic acid was chromatographically analyzed using Shim Pack CLC-CN, C18 (150 x 6 mm, 5 mu) column and a mobile consisting of methanol-1\% acetic acid solution (4:1) at a flow rate of 1.0 ml min(-1). The mass spectrometer (LCQ-Finnigan) was programmed in the positive single ion monitoring (SIM) to permit detection and quantitation of ursolic acid in MS-SIM mode at m/z 439.2, 411.2 and 390.9. Linear correlation (r > 0.99) of the peak area and the concentration of ursolic acid over the concentration range 0.25-10 microg ml(-1) was obtained. The relative standard deviation (\%R.S.D.) and percentage deviation from the nominal concentrations (\%DEV) were found to be 3.03-3.59\% and -4.5 to +6.2\%, respectively. Analysis of laboratory-made mixtures containing known concentrations of ursolic acid, as quality control samples, gave a mean recovery percentage of 97.8\%. Application of the proposed method for the analysis of leaves and twigs extracts of S. holocarpa Hemsl. gave mean percentage contents of ursolic acid of 0.95 and 0.25\%, respectively. Copyright 2003 Elsevier Science B.V.
This article was published in J Pharm Biomed Anal
and referenced in Journal of Analytical & Bioanalytical Techniques