Abstract
A new on-line, rapid and sensitive column-switch LC/MS/MS method to measure nelfinavir (NFV), an HIV-1 protease inhibitor, and its major metabolite (M1) in rat plasma was developed. Rat plasma containing the analytes and the internal standard was treated with acetonitrile and the supernatant was processed through an on-line extraction and an analytical columns, with a column-switch device. ESI-LC/MS with multiple reaction monitors for appropriate analytes was performed. This assay gave a limit of quantitation (LOQ) of <1 ng/mL for the analytes with 5 min run time. The within-run and between-run precisions were <12 and <10%, respectively. This analytical method was successfully applied to a study to correlate changes in maternal and placental NFV plasma concentrations in rats following NFV exposure in utero.
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