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A sensitive liquid chromatography–electrospray ionization–mass spectrometry method for the simultaneous determination of pentoxyverine citrate and guaifenesin in human plasma—application to pharmacokinetic and bioequivalence studies
Author(s) -
Wen Jinhua,
Zhang Hong,
Xia Chunhua,
Hu Xiao,
Xu Wenwei,
Cheng Xiaohua,
Gao Jun,
Xiong Yuqing
Publication year - 2010
Publication title -
biomedical chromatography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 65
eISSN - 1099-0801
pISSN - 0269-3879
DOI - 10.1002/bmc.1298
Subject(s) - chromatography , chemistry , electrospray ionization , mass spectrometry , ammonium acetate , electrospray , extraction (chemistry) , ethyl acetate , bioequivalence , analyte , selected reaction monitoring , liquid chromatography–mass spectrometry , pharmacokinetics , high performance liquid chromatography , tandem mass spectrometry , medicine
A sensitive and specific liquid chromatography–electrospray ionization–mass spectrometry method for the identification and quantification of pentoxyverine citrate and guaifenesin in human plasma has been developed. After extraction from plasma samples by ethyl acetate, the internal standard and analytes were separated by high‐performance liquid chromatographic on a Shim‐pack VP‐ODS C 18 column (150 × 2.0 mm) using a mobile phase consisting of A (methanol) and B (0.4% glacial acetic acid and 4 mmol/L ammonium acetate) (A:B, 43 : 57). Analysis was performed on a Shimadzu LC/MS‐2010A in selected ion monitoring mode with a positive electrospray ionization interface. The method was linear in the concentration range of 1.0–640.0 ng/mL for pentoxyverine citrate and 0.025–6.4 μg/mL for guaifenesin. The inter‐ and intra‐ precision were all within 12% and accuracy ranged from 85 to 115%.The lower limits of quantification were 1.0 ng/mL for pentoxyverine citrate and 25.0 ng/mL for guaifenesin. The extraction recovery was on average 81.95% for pentoxyverine citrate and 89.03% for guaifenesin. This is the first assay method reported for the simultaneous determination of pentoxyverine citrate and guaifenesin in plasma using one chromatographic run. Copyright © 2009 John Wiley & Sons, Ltd.