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Metoclopramide concentrations in plasma and urine were determined by high performance liquid chromatography using a cyanopropylsilane column and UV detection. The mobile phase consisted of 0.03M sodium acetate (pH 7.4) and acetonitrile. The plasma samples were extracted with dichloromethane after pH adjustment. Urine proteins were precipitated with acetonitrile. The reproducibility and precision of the methods were demonstrated by the analysis of samples containing 5 – 200 ng/ml plasma and 0.25 – 200 ug/ml urine. The glucuronide and sulfate conjugates of metoclopramide were also quantitated after differential acid hydrolysis of urine samples. The conditions for acid hydrolysis were studied. The methods have been applied to the analysis of plasma and urine samples obtained from human volunteers.
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Nygard et al. (1986) studied this question.
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