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Journal of Structural Chemistry

2010 year, number 3

VOLUMETRIC PROPERTIES OF AQUEOUS SOLUTIONS OF AMINO ACIDS FROM THE SINGULAR TO CRITICAL TEMPERATURE

V. P. Korolev
Keywords: amino acids, aqueous solutions, volumetric properties
Pages: 509-517

Abstract

The partial volume of amino acids in aqueous solution is assumed to be zero for Т = 227 K (singular temperature) and Т = Тc (critical temperature). The literature data for (T) of ten amino acids at 278-328 K are reproduced by the two-parameter equation with a standard deviation of 0.06-0.16 cm3/mol. Only for asparagine and tryptophan the standard deviation exceeds 0.3 cm3/mol. In the case of glycine and alanine, the relation (T) in the high temperature range is obtained. is divided into contributions (/∂p)T and -T·(/∂p)T. Their dependence on the temperature and amino acid nature is discussed. Positive values of (/∂p)T characterize amino acids as water structure breakers; however, the differentiation of compounds by this feature is not successful. The behavior of amino acids in aqueous solutions is compared with the behavior of urea