Effect of electrostatic interactions on the relaxation dynamics of pharmaceutical eutectics.

08:00 EDT 12th April 2019 | BioPortfolio

Summary of "Effect of electrostatic interactions on the relaxation dynamics of pharmaceutical eutectics."

In this paper, we investigate the temperature dependent relaxation dynamics in the glassy and supercooled liquid state of dipolar and ionic eutectic mixtures made of two anesthetic agents (lidocaine and prilocaine) and their hydrochloride salts, respectively. In addition to eutectic phases containing 1:1 and 4:1 mol/mol of LD/PRL and LD-HCl/PRL-HCl, respectively, the relaxation properties of non-eutectic compositions and parent compounds are also studied. We found that electrostatic long-range forces determine strongly the dielectric and mechanical response of eutectic material. As a result of Coulomb interactions between ion pairs an additional β-relaxation mode was found in the dielectric spectra of glassy LD-HCl/PRL-HCl mixtures. On the other hand, the studies of relaxation dynamics of ionic and non-ionic mixtures at T > T revealed continuous decrease of both fragility m and the length scale of dynamic heterogeneity N(T), with simultaneous growth of T, when the electrostatics forces appear. At the same time, we found the charge transport being decoupled from structural dynamics in all studied ionic binary mixtures that is due to the fast proton hopping. However, the efficiency of proton transport is dropping down with an increase of T.


Journal Details

This article was published in the following journal.

Name: European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences
ISSN: 1879-0720


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Anesthesia is the loss of feeling or sensation in all or part of the body. It may result from damage to nerves or can be induced by an anesthetist (a medical professional) using anesthetics such as thiopental or propofol or sevoflurane during a surgical ...

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