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Solvation of diclofenac in water from atomistic molecular dynamics simulations - interplay between solute-solute and solute-solvent interactions
Citation key ISI:000428779700025
Author Kozlowska, Mariana and Rodziewicz, Pawel and Utesch, Tillmann and Mroginski, Maria Andrea and Kaczmarek-Kedziera, Anna
Pages 8629-8639
Year 2018
ISSN 1463-9076
DOI 10.1039/c7cp08468d
Address THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Journal PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 20
Number 13
Month APR 7
Publisher ROYAL SOC CHEMISTRY
Abstract The solubility-permeability relationship of active pharmaceutical ingredients determines the efficacy of their usage. Diclofenac (DCL), which is a widely used nonsteroidal anti-inflammatory drug, is characterized by extremely good membrane permeability, but low water solubility limiting drug effectiveness. The present research focuses on the fundamental explanation of this limitation using the combination of ab initio and classical molecular dynamics simulations of different ionic forms of DCL in water, namely, ionized, un-ionized and the mixture of them both. The analysis of diclofenac solvation in an aqueous environment is used to understand the origin of drug precipitation, especially in gastric pH. The used computational approach reveals the formation of micelle-like self-associated aggregates of diclofenac in water as the result of intermolecular - interactions and C-H hydrogen bonds. The DCL aggregation in water is shown to depend mostly on drug concentration, protonation and temperature of the aqueous environment. The detected self-association properties of the drug in water are likely to be of great importance during the development of new drug formulations and fabrication of drug adsorbents for wastewater.
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