Partial molar volumes of l-alanine,dl-serine,dl-threonine,l-histidine,glycine, and glycylglycine in water,NaCl, and DMSO aqueous solutions at T = 298.15 K |
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| Affiliation: | 1. ISIR, Osaka University, Ibaraki, Osaka 567-0047, Japan;2. Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan;3. Department of Physics, University of Dhaka, Dhaka 1000, Bangladesh;1. Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Dipartimento di Scienze Chimiche, Università di Messina, Viale Ferdinando Stagno d’Alcontres, 31-I-98166 Messina (ME), Italy;1. School of Chemistry and Chemical Engineering, Anqing Normal University, Anqing 246011, PR China;2. College of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, PR China;1. College of Information and Electronic Engineering, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, China;2. Department of Physics, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China;1. Department of Chemistry, Acharya Nagarjuna University, Nagarjuna Nagar, 522 510 Guntur, A.P, India;2. Department of Chemistry, Lankireddy Balreddy Engineering College, Mylavaram Krishna 521 230, A.P, India |
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| Abstract: | The apparent molar volumes of l-alanine, dl-serine, dl-threonine, l-histidine, glycine, and glycylglycine in water and in the aqueous solutions of NaCl and DMSO with various concentrations at T = 298.15 K have been measured by the precise vibrating-tube digital densimeter. The calculated partial molar volumes at infinite dilution have been used to obtain corresponding transfer volumes from water to various solutions. The experimental results show that the standard partial molar volumes of the above amino acids and peptide at the dilute DMSO aqueous solutions are very close to those in water. However, the volumes show several types of variations with the increase of the concentrations of DMSO due to different types of side chain of amino acids, which should be discussed specifically. The NaCl changes considerably the infinite dilution standard partial molar volumes of the above amino acids and peptide in the aqueous solutions. The infinite dilution standard partial molar volumes of the each amino acids and peptide increase with the concentrations of NaCl. The experimental results have been rationalized by a cosphere overlap model. |
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