Add time:07/23/2019         Source:sciencedirect.com

A specific, precise and accurate assay for determination of rifabutin in human plasma using Extrelut column extraction was developed and validated. Rifabutin concentrations were calculated with a standard curve ranging from 5 to 800 ng ml−1, using a split-curve approach. Chromatographic peaks were separated by means of a 5 μm Symmetry Shield RP8 using a KH2PO4 (0.05 M) buffer–acetonitrile mobile phase. Detection wavelength was set at 275 nm. Chromatography was carried out at room temperature (20–25°C). The limit of quantification was 5 ng ml−1. The recovery was over 71%. The intra-day precision of the assay was 5, 7, and 1% while the inter-day precision was 11.2, 8.1, and 5.8% at concentrations of 30, 150 and 500 ng ml−1, respectively. The accuracy ranged from 99 to 108%. Forty of the drugs most commonly administered to HIV-positive patients were found not to interfere with the assay. The assay has been used in a comparative study of rifabutin pharmacokinetics in HIV-positive patients with or without wasting syndrome.

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