Investigation on molecular interaction of amino acids in aqueous disodium hydrogen phosphate solutions with reference to volumetric and compressibility measurements

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• 作者：Harsh Kumar ; Meenu Singla ; Rajeev Jindal
• 关键词：Apparent molar volume ; Apparent molar isentropic compression ; Amino acid ; Disodium hydrogen phosphate
• 刊名：Journal of Chemical Thermodynamics
• 出版年：March, 2014
• 年：2014
• 卷：70
• 期：Complete
• 页码：190-202
• 全文大小：822 K

文摘

The interactions of amino acids glycine (Gly), l-alanine (Ala), and l-valine (Val) with disodium hydrogen phosphate (DSHP) as a function of temperature have been investigated by combination of volumetric and acoustic measurements. Densities (蟻) and speeds of sound (u) of amino acids in aqueous solutions of disodium hydrogen phosphate have been measured at T = (288.15, 293.15, 298.15, 303.15 and 308.15) K and atmospheric pressure. The apparent molar volume (V_蠒), the partial molar volume (V_蠒⁰) and standard partial molar volumes of transfer (螖V_蠒⁰) for amino acids from water to aqueous disodium hydrogen phosphate solutions have been calculated from density data. Partial molar adiabatic compressibility (魏_蠒,s) and partial molar adiabatic compressibility of transfer () have been calculated from speed of sound data. The pair (V_AB, 魏_AB) and triplet (V_ABB, 魏_ABB) interaction coefficient have been calculated from both the properties. The results have been explained based on competing patterns of interactions of co-solvents and the solute.