Determination of rifabutin by high-performance liquid chromatography using on-line concentration and column switching

Journal of Chromatography. B, Biomedical Applications
H Bartels, R Bartels

Abstract

A simple HPLC method has been developed that allows the sensitive determination of rifabutin (RBT) in human serum using on-line concentration and column switching. After pretreatment of the serum with acetonitrile and centrifugation, the samples were applied to a concentration column (CC) (Zorbax CN). Washing with phosphate buffer-methanol removed most of the contaminating substances. Via a six-port valve the CC was switched to the analytical mode. RBT was separated on a Chromspher RP 8 column (acetonitrile-phosphate buffer pH 7.4/sodium chloride) and determined photometrically at 278 nm. The lower limit of quantification for 200 microliters serum precipitated with 200 microliters acetonitrile and after injection of 2 x 150 microliters was 33 micrograms/l and linearity was observed up to 27 mg/l. Different modes of sample application (single, repeated, and different injection volume portions), as well as washing time, cycle time and different CC materials were investigated.

References

Nov 1, 1990·Xenobiotica; the Fate of Foreign Compounds in Biological Systems·M Strolin BenedettiM Repetto
Jul 1, 1989·Xenobiotica; the Fate of Foreign Compounds in Biological Systems·G CocchiaraA Vigevani
Sep 22, 1993·Journal of Chromatography·P Campíns-FalcóA Sevillano-Cabeza

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