Mechanism of Ion-Pair Strategy in Modulating Skin Permeability of Zaltoprofen: Insight from Molecular-Level Resolution Based on Molecular Modeling and Confocal Laser Scanning Microscopy

Journal of Pharmaceutical Sciences
Hongxia CuiLiang Fang

Abstract

The study was carried out to investigate the mechanism of the ion-pair strategy in modulating zaltoprofen (ZAL) skin permeability. Seven organic amines were chosen as counter ions and the formation of ion pairs was confirmed by Fourier transform infrared and proton nuclear magnetic resonance spectroscopy. In vitro permeation studies showed that the permeation of ZAL was significantly promoted with alkylamines and cycloalkanolamines, while significantly retarded with alkanolamines. The results were further visualized by confocal laser scanning microscopy studies. Investigations from the standpoint of solubility, partition, and diffusion indicated that the modulation mechanism of ion pairs was mainly attributed to an alteration of ZAL diffusion in the skin, which was accomplished by masking the carboxyl of ZAL and adding the hydrogen-bonding groups of counter ions. A negative correlation was observed between the enhancement ratio of ion pairs and the polar surface area of counter ions. Molecular modeling revealed that ion pairs acted with the nature of different affinity to ceramide, which would be responsible for the diffusion retardation. The study indicated that the maximum effect of ion pairs tended to be achieved with counte...Continue Reading

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Citations

Aug 31, 2016·European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences·Chao LiuLiang Fang
Jan 22, 2021·Drug Delivery and Translational Research·Delly RamadonRyan F Donnelly

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