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http://nopr.niscpr.res.in/handle/123456789/46708| Title: | Thermodynamics of transfer of amino acids from water to ethanol-water mixtures |
| Authors: | Jahagirdar, D V Arbad, B R Chondhekar, T K Pankanti, (Miss) S U |
| Issue Date: | Apr-1989 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Dissociation constants of  -tryptophan, -histidine, -aspartic acid, -glutamic acid and t-serine have been determined in water and ethanol-water mixtures at 298 K potentiometrically by the Calvin-Bjerrum titration technique. These values have been used to calculate the free energies of transfer  G(i) involved in the dissociation equilibria. G (RH ) and G(R2-) have been calculated (RH±) being the zwitter ion) knowing the solubilities of these acids in ethanol-water mixtures. Contribution due to amino acid side chain to the free energy of transfer from 100% ethanol to water has been estimated in acidic, neutral and basic media. The equivalence of these values confirms the hydrophobicity scale first proposed by Nozaki and Tanford [J bioi Chem, 246 (1971) 2211]. |
| Page(s): | 366-370 |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Appears in Collections: | IJC-A Vol.28A(05) [May 1989] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCA 28A(5) 366-370.pdf | 2.8 MB | Adobe PDF | View/Open |
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