Abstract
A high-performance liquid chromatographic system with automated precolumn extraction was developed for the determination of propofol in human serum. Propofol of directly injected serum sample was enriched on a protein-coated mu Bondapak phenyl precolumn while serum constituents such as proteins and salts were eluted to waste. Thereafter, using an on-line column-switching system, the drug was quantitatively transferred and separated on a second analytical column followed by spectrophotometric determination at 270 nm. Good precision, accuracy and linearity were obtained over a range of 30-3000 ng/mL propofol in human serum. The developed method proved to be fast, simple, reproducible, reliable and therefore convenient for propofol monitoring from serum. The recovery of propofol in serum samples from the lowest to the highest concentration ranged from 96.84 to 100.16% (n = 5). The assay was applied to study the pharmacokinetic of the drug in six women undergoing elective caesarean section under general anaesthesia induced with a single intravenous bolus dose of propofol (2.5 mg/kg).
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