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- W1964549091 abstract "A new HPLC method was developed for the estimation of carboxylic acid metabolite of clopidogrel bisulfate in rat plasma using atorvastatin as internal standard. Plasma samples were extracted with a mixture of ethyl acetate and di-chloro methane (80:20, v/v) followed by subsequent reconstitution in a mixture of water:methanol:acetonitrile (40:40:20, v/v). The chromatographic separation was achieved with gradient elution on Kromasil ODS, 250 mm x 4.6 mm i.d., 5 microm analytical column maintained at 30 degrees C. Carboxylic acid metabolite of clopidogrel as well as the internal standard were detected at a wavelength of 220 nm. The method was validated as per USFDA guidelines. Calibration curves were linear in the concentration range of 125.0-32,000 ng/ml and the correlation coefficient was better than 0.999. The extraction efficiency for the carboxylic acid metabolite of clopidogrel was more than 85.76%. The intra-day accuracy ranged from 98.9% to 101.5% with a precision of 1.30% to 6.06%. Similarly, the inter-day accuracy was between 96.2% and 101.1% with a precision of 3.47% to 4.30%. The drug containing plasma samples were stable at -70 degrees C for 48 days and at ambient temperature for 24h. In the auto-sampler maintained at 15 degrees C, the processed and reconstituted samples were stable for 35 h. The drug containing frozen plasma samples were stable enough to with stand three freeze thaw cycles. The method was successfully applied to the pharmacokinetic study of the two different polymorphs of clopidogrel bisulfate in Wistar rat." @default.
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- W1964549091 date "2005-07-25" @default.
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- W1964549091 title "Estimation of carboxylic acid metabolite of clopidogrel in Wistar rat plasma by HPLC and its application to a pharmacokinetic study" @default.
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- W1964549091 doi "https://doi.org/10.1016/j.jchromb.2005.05.013" @default.
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