Thermodynamic Properties of L-Methionine and Nicotinic Acid in an Aqueous Buffer Solution
| Autor: | V. I. Smirnov, G. N. Tarasova, E. Yu. Tyunina |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Methionine Context (language use) 02 engineering and technology Calorimetry Buffer solution 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Enthalpy change of solution Amino acid chemistry.chemical_compound chemistry Mole Physical and Theoretical Chemistry 0210 nano-technology Dissolution Nuclear chemistry |
| Zdroj: | Russian Journal of Physical Chemistry A. 94:2238-2243 |
| ISSN: | 1531-863X 0036-0244 |
| Popis: | Interaction between L-methionine (Met) and nicotinic acid (NA) in an aqueous buffer solution (pH 7.4) is studied via dissolution calorimetry and densimetry. The thermodynamic characteristics of the formation of a 1 : 1 molecular complex between Met and L at Т = 298.15 K are determined. The experimental density of the Met–L–buffer system is measured at T = 288.15, 298.15, 303.15, 308.15, and 313.15 K in the 0.0036 to 0.0367 mol/kg range of NA concentrations at a constant Met concentration (0.01249 mol/kg). It is shown that the extreme character of apparent molar volume–concentration dependences suggests the structure-strengthening effect NA has on solutions containing the amino acid (Met) with a slight shift of maxima with increasing temperature. The results are discussed in the context of the Gurney model. |
| Databáze: | OpenAIRE |
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