Abstract
A direct injection column-switching HPLC method was developed and validated for quantification of sanfetrinem in rat and dog plasma. Following dilution with buffer, samples were directly injected onto the system. The analyte was retained in an enrichment column while endogenous plasma components were eluted to waste. Sanfetrinem was then back-flushed to the analytical column for separation and quantification with an ultraviolet detector. Sample batch size was increased by adding a washing phase of the enrichment column and by alternating the injections between two enrichment columns. The method is very simple and sample preparation is minimal. The method has been fully validated and shown to be specific, accurate and reproducible.
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