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- W2134605895 abstract "A sensitive, selective, precise, and robust high-performance thin-layer chromatography method was developed and validated for analysis of two new recently isolated sterols, 4α-methyl-24β-ethyl-5α-cholesta-14,25-dien-3β-ol (1) and 24β-ethylcholesta-5,9(11),22E-trien-3β-ol (2), and a triterpene, betulinic acid (3), in Clerodendrum inerme extract. The method employed HPTLC plates precoated with silica gel 60F254 as the stationary phase. To achieve good separation, an optimised mobile phase consisting of toluene-acetone (94:06, v/v) was used (Rf 0.48, 0.34, and 0.22 for compounds 1, 2, and 3, respectively). Densitometric determination of the above compounds was carried out in reflection/absorption mode at 620 nm. Optimised chromatographic conditions provide well separated compact spots for the compounds 1, 2, and 3. The calibration curves were linear in the concentration range of 100–2500 ng/spot. The method was validated for precision, robustness, and recovery. The limits of detection and quantitation were 5, 6, and 10 μg/mL and 14, 18, and 29 μg/mL, respectively, for 1, 2, and 3. The method reported here is reproducible and convenient for quantitative analysis of these compounds in the aerial parts of C. inerme." @default.
- W2134605895 created "2016-06-24" @default.
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- W2134605895 date "2007-08-01" @default.
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- W2134605895 title "High-performance thin-layer chromatographic method for quantitative determination of 4α-methyl-24β-ethyl-5α-cholesta-14,25-dien-3β-ol, 24β-ethylcholesta-5,9(11),22E-trien-3β-ol, and betulinic acid inClerodendrum inerme" @default.
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- W2134605895 doi "https://doi.org/10.1002/jssc.200700073" @default.
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