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Solvent effects on protonation equilibria of some amino acids and peptides in different aqueous solutions of ethanol.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Jabbari, Morteza Gharib,, Farrokh |
| Copyright Year | 2010 |
| Abstract | The protonation constants of glycine, L-alanine, glycyl-glycine, glycyl-glycyl-glycine and glycyl-L-alanine have been determined in 10-80% (v/v) ethanol-water mixtures at 25 °C and constant ionic strength (0.1 mol L-1 sodium perchlorate), by potentiometric technique and calculated using a suitable computer program, which employs a nonlinear least-squares method. The effect of solvent composition on the protonation constants in the mixed solvents were correlated with the Kamlet-Taft solvatochromic parameters (α, β and π*). It was shown that logK1 and logK2 values of glycine, L-alanine and peptides increasing with increase ethanol content up to 50% and then tend to decrease. Further, an overview of the effect of preferential solvation and solvent structure of electrolytes in ethanol-water mixtures on the values of the protonation constants in these media were also discussed. |
| File Format | PDF HTM / HTML |
| PubMed reference number | 24061727 |
| Journal | Medline |
| Volume Number | 57 |
| Issue Number | 2 |
| Alternate Webpage(s) | http://acta-arhiv.chem-soc.si/57/57-2-325.pdf |
| Journal | Acta chimica Slovenica |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
