alexa Analysis of morphine and its major metabolites by differential radioimmunoassay.
Pharmaceutical Sciences

Pharmaceutical Sciences

Pharmaceutica Analytica Acta

Author(s): Hand CW, Moore RA, McQuay HJ, Allen MC, Sear JW

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Abstract The analysis of morphine, morphine-3-glucuronide (M-3-G) morphine-6-glucuronide (M-6-G) by differential radioimmunoassay using iodinated label and three different antisera is described. These methods were used to measure concentrations of morphine and its conjugated metabolites in human plasma, over a 3-h period, following a single 10 mg intravenous dose. In 13 patients peak concentrations of M-3-G (739 nmol/L +/- 73.7 SEM) were approximately 10 times greater than those of M-6-G (71.3 nmol/L +/- 8.6 SEM). Times to reach these peaks were similar for both metabolites. Decay of morphine from plasma followed a biexponential pattern with a mean terminal half-life of 59.3 min (+/- 8.1 SEM, n = 11). Accurate determination of the half-lives of the glucuronides was not possible due to the short sampling period, but M-6-G seemed to have a similar half-life to morphine, while M-3-G was eliminated more slowly.
This article was published in Ann Clin Biochem and referenced in Pharmaceutica Analytica Acta

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