Abstract
The heat effects of the reaction of a solution of D,L-tryptophan with solutions of KOH and HNO3 were measured by calorimetry at temperatures of 288.15, 298.15, and 308.15 K and ionic strength values of 0.25, 0.5, and 0.75 (KNO3). The effect of the temperature and concentration of the background electrolyte on the heats of dissociation of amino acid was considered. The standard heat effects of ionization of D,L-tryptophan were determined by extrapolation to zero ionic strength. The standard thermodynamical characteristics of the stepwise dissociation of D,L-tryptophan were calculated.
Similar content being viewed by others
References
IUPAC Stability Constants Datebase SCQUERY, Version 3.09 (Academic Software, Otley, UK, 2003).
C. W. Davies, J. Chem. Soc., p. 2093 (1938).
V. P. Vasil’ev, Thermodynamic Properties of Electrolyte Solutions (Vysshaya Shkola, Moscow, 1982), p. 262 [in Russian].
V. P. Vasil’ev, Teor. Eksp. Khim., No. 2, 353 (1966).
G. Arena, R. Cali, and V. Cucinotta, J. Chem. Soc., Dalton Trans., p. 1271 (1983).
L. Pettit, Pure Appl. Chem. 56, 247 (1984).
F. Rodante and F. Fantauzzi, Thermochim. Acta 144, 275 (1989).
O. Yu. Zelenin, L. A. Kochergina, and O. V. Platonycheva, Zh. Fiz. Khim. 78, 1588 (2004) [Russ. J. Phys. Chem. A 78, 1392 (2004)].
P. P. Korostelev, Preparation of Solutions for Chemical Analytical Works (Akad. Nauk SSSR, Moscow, 1962) [in Russian].
V. P. Vasil’ev, V. A. Borodin, and E. V. Kozlovskii, Applications of Computers in Chemical Analytic Calculations (Vysshaya Shkola, Moscow, 1993) [in Russian].
V. A. Borodin, V. P. Vasil’ev, and E. V. Kozlovskii, in Mathematical Problems of Chemical Thermodynamics (Nauka, Novosibirsk, 1985), p. 219 [in Russian].
V. P. Vasil’ev and L. A. Kochergina, Zh. Fiz. Khim. 41, 2777 (1967).
V. P. Vasil’ev, L. A. Kochergina, and T. B. Sokolova, Zh. Obshch. Khim. 48, 650 (1976).
V. P. Vasil’ev, L. A. Kochergina, G. G. Gorboletova, and O. N. Popova, Zh. Fiz. Khim. 71, 1586 (1997) [Russ. J. Phys. Chem. A 71, 1425 (1997)].
V. P. Vasil’ev, Zh. Neorg. Khim. 29, 2785 (1984).
V. P. Poddymov and A. A. Ustinova, Zh. Neorg. Khim. 26, 1307 (1981).
V. P. Vasil’ev, L. A. Kochergina, and V. Yu. Garavin, Zh. Obshch. Khim. 55, 189 (1985).
S. Hauptmann, J. Grefe, and H. Remane, Organic Chemistry (Khimiya, Moscow, 1979; Sci. and Art, 1985).
V. P. Vasil’ev, L. A. Kochergina, and V. Yu. Garavin, Zh. Obshch. Khim. 62, 213 (1992).
R. Morrison and R. Boyd, Organic Chemistry (Mir, Moscow, 1974; Allyn Bacon, Boston).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © L.A. Kochergina, V.V. Chernikov, O.V. Platonycheva, 2011, published in Zhurnal Fizicheskoi Khimii, 2011, Vol. 85, No. 6, pp. 1032–1037.
Rights and permissions
About this article
Cite this article
Kochergina, L.A., Chernikov, V.V. & Platonycheva, O.V. Thermodynamics of stepwise dissociation of D,L-tryptophan in aqueous solution. Russ. J. Phys. Chem. 85, 938–943 (2011). https://doi.org/10.1134/S0036024411060185
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0036024411060185