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Determination of plasma protein binding for sympathomimetic drugs by means of ultrafiltration.
European Journal of Pharmaceutical Sciences 2018 October 32
Ephedrine and its diastereomer pseudoephedrine have long been used in therapy and are part of over-the-counter combination drugs against colds or allergies. Nonetheless, there is scarcely any information on their plasma protein binding in literature. Plasma protein binding is an important parameter from a pharmacokinetic and pharmacodynamic point of view and can play a crucial role in therapy. The aim of this study was to determine the extent of plasma protein binding using ultrafiltration and different types of plasma proteins like human (HSA) and bovine serum albumin (BSA) and human serum. Two orthogonal methods - continuous and discontinuous ultrafiltration - were used to confirm our findings. To get some structural and stereochemical insights into binding affinity towards plasma proteins, all four stereoisomers of ephedrine and pseudoephedrine were included in this study. Since all four stereoisomers exhibit a low affinity towards albumin, other sympathomimetic drugs of structural similarity were tested to investigate the influence of the basic character of the Ephedra alkaloids in their binding to plasma proteins.
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