Izvestiya of Saratov University.

Chemistry. Biology. Ecology

ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)
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Language: 
Russian
Heading: 
Chemistry
Article type: 
Article
UDC: 
544.344.016+536.44:544.344.013-16-14+544.344.3
DOI: 
10.18500/1816-9775-2021-21-1-44-47

Phase diagram of the ?-alanine – water binary system

Autors: 
Cherkasov Dmitry G., Saratov State University
Parfenova Varvara D., Saratov State University
Abstract: 

The phase diagram of the ?-alanine–water binary system was studied using the visual polythermal method and the method of time–temperature curves in а temperature range of -20–90°С. There is a eutectic equilibrium at -18.3°С in the system; the solid phases of this equilibrium are ice and individual ?-alanine. For the first time, the composition of the liquid phase of the eutectic state was determined.

Key words: 
phase equilibria
binary system
phase diagram
eutectic
solubility of ?-alanine
Reference: 
  1. Khimicheskaya entsiklopediya: v 5 t., red. I. L. Knunyants [I. L. Knunyants, ed. Chemical Encyclopedy: in 5 vols.]. Moscow, Sov. Entsiklopediya Publ., 1988–1998, vols. 1–5 (in Russian).
  2. Smirnov V. I., Badelin V. G. Thermochemistry of the solution of ?-alanine in (H2O+alcohol) mixtures at 298.15 K. Thermochimica Acta, 2013, vol. 565, pp. 202–204. http://dx.doi.org/10.1016/j.tca.2013.05.012
  3. McMeekin T. L., Cohn E. J., Weare J. H. Studies in the physical chemistry of amino acids, peptides and related substances. VII. A comparison of the solubility of amino acids, peptides and their derivatives. J. Amer. Chem. Soc., 1936, vol. 58, no. 11, pp. 2173–2181. https://doi.org/10.1021/ja01302a026
  4. Ramasami P. Solubilities of amino acids in water and aqueous sodium sulfate and related apparent transfer properties. J. Chem. Eng. Data, 2002, vol. 47, no. 5, pp. 1164–1166. https://doi.org/10.1021/je025503u
  5. Romero C. M., Oviedo C. D. Effect of temperature on the solubility of ?-amino acids and ?, ?-amino acids in water. J. Solut. Chem., 2013, vol. 42, no. 6, pp. 1355– 1362. https://doi.org/10.1007/s10953-013-0031-9
  6. Anosov V. Ya., Ozerova M. I., Fialkov Yu. Ya. Osnovy fi zikohimicheskogo analiza [Fundamentals of physico-chemical analysis]. Мoscow, Nauka Publ., 1976. 504 p. (in Russian).
  7. Il’in K. K., Sinegubova S. I., Demahin A. G. Rukovodstvo k prakticheskim zanyatiyam po fi ziko-himicheskomu analizu dvuhkomponentnyh sistem [A guide to practical exercises in physico-chemical analysis of two-component systems]. Saratov, Izd-vo Sarat. un-ta, 1990. 63 p. (in Russian).
Received: 
12.11.2020
Accepted: 
30.11.2020
Published: 
01.03.2021