Quantitation of the anticonvulsant cinromide (3-bromo-n-ethylcinnamamide) and its major plasma metabolites by thin-layer chromatography |
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Authors: | R.L. DeAngelis M.M. Robinson A.R. Brown T.E. Johnson R.M. Welch |
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Affiliation: | Department of Medicinal Biochemistry, Wellcome Research Laboratories, Research Triangle Park, NC 27709 U.S.A. |
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Abstract: | A quantitative thin-layer chromatography (TLC) procedure is described for the analysis of cinromide (3-bromo-N-ethylcinnamamide) and its two major metabolites, 3-bromocinnamamide and 3-bromocinnamic acid in plasma of the dog. These compounds were recovered from acidified plasma by extraction into benzene with a recovery of 95 ± 5%. All three compounds were quantitated directly on a TLC plate by ultraviolet absorbance densitometry at 270 nm. The linear dynamic range for the quantitation of the compounds on a TLC plate ranged between 10 and 1000 ng. The complete procedure is useful in the working range of 50 ng/ml to 100 μg/ml of plasma with a coefficient of variability of about 10%. Specificity of the method for parent drug and each of its plasma metabolites was confirmed by high-performance liquid chromatography. The method was used to determine the pharmacokinetics of cinromide and its two major plasma metabolites in dogs following a single oral dose of the drug. |
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