Correlation of the mean ionic activity coefficients of electrolytes in aqueous amino acid and peptide systems |
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| Institution: | 1. Department of Biochemical Engineering, Malakashtar University of Technology, Tehran, Iran;2. Department of Chemistry, Islamic Azad University of Shahrood, Shahrood, Iran;3. South Pars Gas Company, Booshehr, Assaluyeh, Iran;1. Central Research Laboratories, Aekyung Co., Ltd., Daejeon 305-345, Republic of Korea;2. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;1. Gas Hydrates Division, National Geophysical Research Institute (CSIR-NGRI), Council of Scientific and Industrial Research, Hyderabad 500007, India;2. Department of Physics, Osmania University, Hyderabad 500007, India;1. Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, PR China;2. School of Chemistry and Chemical Engineering, Linyi University, Lingyi 27600, PR China;1. Department of Chemistry, Faculty of Sciences, University of Craiova, Str. Calea Bucuresti 107 I, 200512 Craiova, Romania;2. Department of Chemistry, University of Turin, Via P. Giuria 9, 10125 Torino, Italy;3. Department of Physical Chemistry, University of Łódź, ul. Pomorska 165, 90-236 Łódź, Poland;1. National Iranian Oil Company, West Oil and Gas Production Company, Iran;2. Sh. Hasheminejad Gas Processing Co., National Iranian Gas. Co, Sarakhs, Iran |
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| Abstract: | The activity coefficients of electrolytes in amino acid (peptide) aqueous systems were predicted using an expression for the excess Gibbs free energy of the solution. The model combines the contribution of long-range interactions given by the Khoshkbarchi–Vera model and the contribution of short-range interactions by the local composition based models such as the Wilson, the NRTL and the NRTL–NRF. The local composition models accurately correlate the activity coefficients of 30 amino acid (peptide)–water–electrolyte systems. The results show that the Wilson model can accurately correlate the activity coefficient of the electrolyte in amino acid (peptide) aqueous systems. |
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