Pethidine binding in plasma: effects of methodological variables.
Open Access
- 1 April 1984
- journal article
- Published by Wiley in British Journal of Clinical Pharmacology
- Vol. 17 (4) , 411-415
- https://doi.org/10.1111/j.1365-2125.1984.tb02365.x
Abstract
Several methodological variables potentially influencing the plasma protein binding of [14C]-pethidine in vitro were investigated using equilibrium dialysis and rigorous pH control. Ionic strength of buffer, pethidine concentration and 21 days of plasma samples frozen to −8 degrees C did not affect the outcome of the binding experiments. Unbound fraction decreased with increasing temperatures between 25 degrees C and 37 degrees C. Unbound fraction decreased with increased pH between pH 7.0 and 8.0; the mean unbound fraction at an equilibrium pH of 7.4 and at 37 degrees C was 0.58 (s.d. 0.03, n = 58). It is likely that previous reports of pethidine unbound fraction as being between 0.2 and 0.4 represent artefacts caused by inadequate pH control during dialysis.Keywords
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