Molecular dynamics studies on the water mixtures of pharmaceutically important ionic liquid lidocaine HCl
Molecular Pharmaceutics, ISSN: 1543-8384, Vol: 9, Issue: 5, Page: 1250-1261
2012
- 52Citations
- 45Captures
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Metrics Details
- Citations52
- Citation Indexes52
- 52
- CrossRef49
- Captures45
- Readers45
- 45
Article Description
In this paper the molecular dynamics of a common local-anesthetic drug, lidocaine hydrochloride (LD-HCl), and its water mixtures were investigated. By means of broadband dielectric spectroscopy and calorimetric measurements it was shown that even a small addition of water causes a significant effect on the relaxation dynamics of analyzed protic ionic liquid. Apart from the two well-resolved relaxations (σ- and γ-processes) and the β-mode, identified as the JG-process, observed for anhydrous LD-HCl, a new relaxation peak (ν) is visible in the dielectric spectra of aqueous mixtures of this drug. Additionally, the significant effect of the water on the glass transition temperature of LD-HCl was found. The sample characterized with mole fraction of water X = 0.44 reveals the glass transition temperature T , 42 K lower than that of anhydrous material (307 K). Finally, it was shown that by amorphization of the hydrochloride salt of lidocaine it is possible to obtain its room temperature ionic liquid form. © 2012 American Chemical Society.
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