Determination of carbocysteine in human plasma by liquid chromatography/tandem mass spectrometry employing precolumn derivatization.
A sensitive liquid chromatography/tandem mass spectrometry (LC/MS/MS) method was developed to determine carbocysteine in human plasma using 2-pyridylacetic acid as the internal standard (IS). The method employed derivatization with 10 M hydrochloric acid/methanol, which significantly improved the ionization efficiency of carbocysteine. After methanol-induced protein precipitation of plasma samples, carbocysteine and the IS were derivatized and subjected to LC/MS/MS analysis using atmospheric pressure chemical ionization. The method has a lower limit of quantitation of 20 ng/mL for a 0.2-mL plasma aliquot. The intra- and inter-day precision (RSD), calculated from quality control (QC) samples, was less than 7%. The accuracy, determined using QC samples, was within +/- 1%. The method offered increased sensitivity, selectivity and speed of analysis over existing methods. The method was utilized to support clinical pharmacokinetic studies of carbocysteine in volunteers following oral administration.[1]References
- Determination of carbocysteine in human plasma by liquid chromatography/tandem mass spectrometry employing precolumn derivatization. Chen, X., Zhong, D., Han, Y., Xie, Z. Rapid Commun. Mass Spectrom. (2003) [Pubmed]
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