Partial molar characteristics of glycine and alanine in aqueous solutions at high pressures calculated from ultrasonic velocity data

Tigran V. Chalikian, Armen P. Sarvazyan, Theodor Funck, Charles A. Cain, Kenneth J. Breslauer

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

We describe a method for evaluating the apparent molar thermodynamic characteristics of solutes using data derived from ultrasonic velocity measurements. Using this method, we have determined the apparent molar volumes, the apparent molar thermal expansibilities, the apparent molar heat capacities, and the apparent molar adiabatic and isothermal compressibilities of glycine and alanine in aqueous solutions over the pressure and temperatures ranges of 1-1000 bar and 18-45°C, respectively. We interpret the resulting data in terms of a temperature and pressure induced reduction in the hydration of the charged termini. Thus, at elevated temperatures and pressures, water in the bulk medium becomes more like water in the hydration shell of the charged groups.

Original languageEnglish (US)
Pages (from-to)321-328
Number of pages8
JournalJournal of physical chemistry
Volume98
Issue number1
DOIs
StatePublished - 1994

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physical and Theoretical Chemistry

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