Determination of diclofenac concentrations in human plasma using a sensitive gas chromatography mass spectrometry method

Shah, Iltaf, Barker, James, Naughton, Declan P., Barton, Stephen J. and Ashraf, Syed Salman (2016) Determination of diclofenac concentrations in human plasma using a sensitive gas chromatography mass spectrometry method. Chemistry Central Journal, 10, p. 52. ISSN (print) 1752-153X

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Background A gas chromatography mass spectrometry (GCMS) method for the determination of diclofenac in human plasma has been developed and validated. Results This method utilizes hexane which is a relatively less toxic extraction solvent compared to heptane and benzene. In addition, phosphoric acid and acetone were added to the samples as deproteination agents, which increased the recovery of diclofenac. These revised processes allow clean extraction and near-quantitative recovery of analyte (approx. 89–95 %). Separation was achieved on a BP-1 column with helium as carrier gas. The molecular ion peaks of the indolinone derivatives of diclofenac ion (m/z 277) and the internal standard, 4-hydroxydiclofenac ion (m/z 439) were monitored by a mass-selective detector using selected ion monitoring (SIM) mode. The linear range for the newly developed and highly sensitive assay was between 0.25–50 ng/mL. The detection and lower quantifiable limits were 0.125 and 0.25 ng/mL, respectively. The inter-day and intra-day coefficients of variation for high, medium and low quality control concentrations were less than 9 %. The robustness and efficacy of this sensitive GCMS method was further demonstrated by using it for a pharmacokinetic study of an oral dosage form of diclofenac, 100 mg of modified-release capsules (Rhumalgan XL), in human plasma. Conclusions This method is rapid, sensitive, specific, reproducible and robust, and offers improved sensitivity over previous methods. This method has considerable potential to be used for detailed pharmacokinetics, pharmacodynamics and bioequivalence studies of diclofenac in humans.

Item Type: Article
Uncontrolled Keywords: human plasma, Diclofenac sodium, GCMS, sensitive GCMS
Research Area: Allied health professions and studies
Faculty, School or Research Centre: Faculty of Science, Engineering and Computing (until 2017) > School of Pharmacy and Chemistry
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Depositing User: James Barker
Date Deposited: 02 Nov 2016 15:28
Last Modified: 27 Jun 2017 12:37

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