Clinical Chemistry
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Clinical Chemistry 31: 60-64, 1985;
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Clinical Chemistry, Vol 31, 60-64, Copyright © 1985 by American Association for Clinical Chemistry

Equilibrium dialysis, ultrafiltration, and ultracentrifugation compared for determining the plasma-protein-binding characteristics of valproic acid

J Barre, JM Chamouard, G Houin and JP Tillement

Equilibrium dialysis, ultrafiltration, and ultracentrifugation were compared to determine their reliability and applicability in the study of binding of an anticonvulsant drug, valproic acid, by plasma proteins. We studied drug binding with pooled serum and with solutions of human serum albumin at physiological concentrations. We compared binding characteristics such as number of binding sites, affinity constants, and percent of binding as measured by each method in the therapeutic range for valproic acid. Results by ultracentrifugation differed from those by equilibrium dialysis and ultrafiltration, which agreed reasonably well with each other.


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