Add time:07/24/2019         Source:sciencedirect.com

The pharmacokinetic and pharmacodynamic behaviour of drugs and the interacting biomolecules are highly influenced by their species-specific physico-chemical properties. The first of such bio-relevant, structure-dependent properties were the species-specific acid-base constants and the co-dependent concentrations, but the past decade brought significant advances to previously uncharted territories, including the experimental determination of species-specific partition coefficients, solubilities and redox equilibrium constants.This review gives an overview of the types and definitions of species-specific physico-chemical and analytical properties. We survey the pertinent literature, the fundamental relationships, and summarize some of our recent work that enabled the determination of species-specific partition coefficients for coexisting, inseparable protonation isomers and pH-independent, microscopic redox equilibrium constants.The thorough insight provided by these species-specific properties improves our understanding of the submolecular mechanism of pharmacokinetic processes. As a result, there are some pieces of clear-cut evidence of practical significance. A few of them are as follows:– passive diffusion into lipophilic media is not necessarily predominated by the non-charged species, contrary to the widespread misbelief.– the reactive microspecies in structure-controlled, highly specific biochemical reactions is not necessarily the major one.– a preventive defence system against oxidative stress can be based upon thiol-disulfide equilibria of custom-tailored redox potentials.

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