Evaluation of Drug Sorption on Laboratory Materials with Abraham Solvation Parameters of Drugs and its Prevention

Purpose Undesired drug sorption on laboratory material surfaces reduces the performance of analytical methods and results in the generation of unreliable data. Hence, we characterized the sorption of drugs and evaluated the sorption extent using a linear free energy relationship (LFER) model with Abraham solvation parameters of drugs. Furthermore, to prevent sorption, the effects of additives, such as organic solvents and salts, were evaluated. Methods The sorption of fifteen model drugs (concentration: 2 mu M), with various physicochemical properties, on materials in 0.2% dimethyl sulfoxide aqueous solutions was evaluated. Drug sorption extent on the materials was determined using high-performance liquid chromatography. The obtained results were analyzed using an LFER model with Abraham solvation parameters of the drugs. The effect of additives on the sorption of itraconazole, one of the most hydrophobic drugs among those tested in this study, was investigated. Results Sorption was dependent on the physicochemical properties of drugs, rather than the type of materials used, and additives altered the rate of drug sorption. Equations were developed to evaluate the sorption extent (nmol) of drugs to glass and polypropylene using the Abraham solvation parameters of the drugs. Conclusions LFER modeling with Abraham solvation parameters of drugs enabled us to evaluate drug sorption on materials. All the additives altered the rate of drug sorption, and some organic solvents effectively prevented sorption. The developed LFER model would be useful for assessment of the sorption properties of compounds in in vitro evaluations in drug discovery research and various other biochemical fields.

Automated summary

Drug sorption on laboratory materials can affect the performance of analytical methods and lead to unreliable data. By using a linear free energy relationship (LFER) model with Abraham solvation parameters, drug sorption can be characterized and evaluated to prevent it. The physicochemical properties of drugs, rather than the materials used, play a key role in sorption, and additives like organic solvents can alter the rate of drug sorption. Equations have been developed to assess drug sorption extent on glass and polypropylene, and the LFER model is valuable for studying sorption properties in drug discovery research and other biochemical fields.