Abstract
A novel high-performance liquid chromatographic method for the determination of codeine, norcodeine and morphine in plasma and urine has been developed. The compounds were separated on a cyano column (15 cm×4.6 mm, 5 μm particle size) using a mobile phase of acetonitrile-triethylamine-distilled water (4:0.1:95.9, v/v) pH 3.1 and then determined by fluorescence detection. Calibration curves in the range 5–200 ng/ml for plasma and 0.1–10 μg/ml for urine were linear and passed through the origin. The imprecision and inaccuracy of the assay were less than 10% and the limits of detection were 2 ng/ml for all three compounds in human plasma.
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