Partial molar volumes of l-serine and l-threonine in aqueous ammonium sulfate solutions at (278.15, 288.15, 298.15, and 308.15) K
| Autor: | Lubomír Hnědkovský, Paula C. Mota, Olga Ferreira, Ivan Cibulka, Simão P. Pinho |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Threonine
Ammonium sulfate Partial molar volume Inorganic chemistry Biophysics Salt (chemistry) Hydration 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry chemistry.chemical_compound 020401 chemical engineering Serine 0204 chemical engineering Physical and Theoretical Chemistry Solubility Sulfate Molecular Biology chemistry.chemical_classification Molality Aqueous solution Partial molar property Ammonium sulphate 0104 chemical sciences Amino acid chemistry |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | In this study, the partial molar volumes of L-serine and L-threonine in aqueous solutions of ammonium sulfate at (0.0, 0.1, 0.3, 0.7, and 1.0) mol.kg(-1) are reported between 278.15 and 308.15 K. Transfer volumes and hydration numbers were obtained, which are larger in L-serine than in L-threonine. Dehydration of the amino acids is observed, rising with the temperature and salt molality. The data suggest that interactions between ions and charged/hydrophilic groups are predominant, and by applying the McMillan and Mayer formalism, it was concluded that they are mainly pair wise. The combination of the data presented in this study with solubility and molecular dynamics data suggests a stronger interaction of the ammonium cation with the zwitterionic centers of the amino acids when compared to the interactions of those centers with the sulfate anion. This study was supported by Project PEst-C/EQB/LA0020/2011, financed by FEDER through COMPETE—Programa Operacional Factores de Competitividade, and by FCT—Fundação para a Ciência e a Tecnologia. This work was also co-financed by QREN, ON2 and FEDER (Project NORTE-07- 0162-FEDER-000050). The stay of P. C. Mota at ICT Prague was arranged within the ERASMUS Program. |
| Databáze: | OpenAIRE |
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