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Issue 0, 1977
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Thermodynamics of solution of two forms of DL-α-amino-n-butyric acid in water

Abstract

Two crystalline polymorphic forms of DL-α-amino-n-butyric acid have been obtained and have been shown to be identical to the A-form and B-form previously described by Iitaka and coworkers. The two forms differ in heat of solution and in their solubility in water. We find that for the A-form at 298 K, ΔH°s= 374 cal mol–1, ΔG°s= 1772 cal mol–1 and ΔS°s=–4.7 cal K–1 mol–1 and for the B-form ΔH°s= 1653 cal mol–1, ΔG°s= 1883 cal mol–1 and ΔS°s=–0.8 cal K–1 mol–1. Although the B-form is the stable form at 298 K, it is predicted from the above measurements that the A-form should be the stable form above ∼ 326 K.

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Article type: Paper
DOI: 10.1039/F19777300181
J. Chem. Soc., Faraday Trans. 1, 1977,73, 181-185

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    Thermodynamics of solution of two forms of DL-α-amino-n-butyric acid in water

    M. H. Abraham, E. Ah-Sing, R. E. Marks, R. A. Schulz and B. C. Stace, J. Chem. Soc., Faraday Trans. 1, 1977, 73, 181
    DOI: 10.1039/F19777300181

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