Simultaneous determination of efavirenz, rifampicin and its metabolite desacetyl rifampicin levels in human plasma |
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Authors: | Fox Deirdre O'Connor Robert Mallon Patrick McMahon Gillian |
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Institution: | a School of Chemical Sciences, Dublin City University, Dublin 9, Ireland b National Institute for Cellular Biotechnology, Dublin City University, Dublin 9, Ireland c School of Nursing, Dublin City University, Dublin 9, Ireland d Infectious Diseases Outpatients Clinic, Mater Misericordiae University Hospital, Eccles Street, Dublin 7, Ireland |
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Abstract: | A simple and rapid isocratic, high performance liquid chromatography (HPLC) assay employing solid phase extraction (SPE) for the simultaneous determination of the anti HIV drug, efavirenz, the anti-tuberculosis drug, rifampicin and the desacetyl metabolite of rifampicin in plasma from HIV/tuberculosis infected patients has been developed. Using a Zorbax SB-Phenyl reverse-phase analytical column with UV detection, good separation and detection of the drugs was attained within a 10 min run time. Intra- and inter-assay precision RSD values were found to be less than 15% at the concentrations examined (0.1-20 μg/mL). The LOQ was found to be 0.1 μg/mL for each agent and the assay was found to generate a linear response up to 20 μg/mL.This low cost assay can accurately detect efavirenz and rifampicin concentrations within a clinically relevant concentration range using standard chromatography equipment, making it particularly applicable to resource-limited settings. |
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Keywords: | HPLC-UV SPE Efavirenz Rifampicin Desacetyl rifampicin Plasma |
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