Journal
FLUID PHASE EQUILIBRIA
Volume 300, Issue 1-2, Pages 105-109Publisher
ELSEVIER
DOI: 10.1016/j.fluid.2010.10.020
Keywords
L-Glutamic acid; Solubility; Polymorph; Enthalpy or entropy of dissolution
Funding
- National Nature and Science Foundation of China (NSFC) [20776098]
- Seed Foundation of Tianjin University
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The solubility of metastable alpha-form and stable beta-form of L-glutamic acid in different aqueous solvent mixtures was measured by analytical gravimetric method. The solubility of beta-form in ethanol + water, 1-propanol + water and acetone + water at 308 K was investigated and the data were correlated by (CNIBS)/Redlich-Kister equation. The solubility of alpha and beta-form of L-glutamic acid in pure water and ethanol + water mixtures at temperature between 293 K and 328 K were also investigated. Based on the solubility data measured, the dissolution enthalpy and entropy of two forms of L-glutamic acid were determined using van't Hoff plots. (C) 2010 Elsevier B.V. All rights reserved.
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