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A simple and sensitive high-performance liquid chromatographic method was developed for quantification of the metabolin of meclofenoxate, chlorophenoxyacetic acid, in human plasma. Ibuprofen was used as an internal standard. The present method used protein precipitation for extraction of chlorophenoxyacetic acid from human plasma. Separation was carried out on a reversed-phase C(18) column. The column effluent was monitored by UV detection at 254 nm. The mobile phase was a mixture of methanol and water containing 1.0% glacial acetic acid (70:30 v/v) at a flow rate of 1.0 mL/min. The column temperature was 20 degrees C. This method was linear over the range of 0.047-28.20 microg/mL with a regression coefficient greater than 0.99. The mean recovery of chlorophenoxyacetic acid and IS were (79.54 +/- 6.33)% and (78.48 +/- 2.14)%, respectively, and the method was found to be precise, accurate, and specific during the study. The method was successfully applied for pharmacokinetic study of chlorophenoxyacetic acid in human.
Ni et al. (Sat,) studied this question.
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