期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 291, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2019.111289
关键词
Diffusion; NMR; 2-aminobutyric add (AABA); 4-aminobutyric add (GABA); Sodium chloride
资金
- The Coimbra Chemistry Centre - Fundacao para a Ciencia e a Tecnologia (FCT), Portuguese Agency for Scientific Research [UlD/QUI/U10313/2019]
- The Coimbra Chemistry Centre - Fundacao para a Ciencia e a Tecnologia (FCT), Portuguese Agency for Scientific Research, through COMPETE
- FEDER European Regional Development Fund through the COMPETE Programme
- National Funds by FCT [REEQ/481/QU1/2006, RECl/QEQ-QFI/0168/2012, CENTRO-07-CT62-FEDER-002012]
- Rede Nacional de Ressonfincia Magnetica Nuclear (RNRMN)
- University of Alcala (Spain)
Ternary mutual diffusion coefficients measured by the Taylor dispersion method are reported for two aqueous systems, that is, DL-2-aminobutyric add (AABA) + sodium chloride, and DL-4-aminobutyric acid (GABA) + sodium chloride at 298.15 K, and at different carrier concentrations (from 0 to 0.010 mol dm(-3)). These data, complemented by NMR measurements, permit us to have a better understanding of the structure of these ternary systems, and their thermodynamic and transport behaviour. The effect of the ionic strength on the transport properties of both amino acids has been assessed. Contrary to AABA, the presence of sodium chloride does not affect the structure of GABA and its diffusion properties. This has been justified by the preferential intramolecular electrostatic interaction between ammonium and carboxylate groups. (C) 2019 Elsevier B.V. All rights reserved.
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