title: Pethidine binding in plasma: effects of methodological variables.
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.
mesh_terms: D001798:Blood Proteins / Q000378:metabolism; D003956:Dialysis; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008297:Male; D008614:Meperidine / Q000097:blood*; D010949:Plasma / Q000378:metabolism; D011485:Protein Binding; D013696:Temperature
chemical_list: D001798:Blood Proteins; D008614:Meperidine