Experimental assessment of physicochemical properties of L-phenylalanine and L-arginine in (water + 1-butyl-3-methylimidazolium bromide / tributylmethylammonium chloride) solutions at various temperatures

Abstract

The experimental data from acoustic, volumetric, and viscometric studies has been used to investigate significant changes in two amino acids, L-phenylalanine and L-arginine, in aqueous solutions of two ionic liquids, 1-butyl-3-methylimidazolium bromide, [BMIM][Br], and tributylmethylammonium chloride, [TBMA][Cl], at T = (293.15 - 313.15) K and experimental pressure P = 101.3 kPa. The limiting apparent molar parameters (volume, V0ϕ, and isentropic compressibility, K0ϕ,s) are evaluated from apparent molar volume, Vϕ, and apparent molar isentropic compressibility, Kϕ,s, respectively. Simultaneously, the corresponding empirical parameters, Sv and Sk, are also calculated. The experimental data is used to calculate the transfer characteristics, ∆trV0ϕ and ∆tr K0ϕ,s, of amino acids from water to aqueous solutions of ionic liquid. Using Jones-Dole equation, the viscosity data is used to evaluate viscosity B-coefficients. All these physicochemical properties are collectively used to gather information regarding all proximities and intermolecular interactions in ternary (L-phenylalanine/L-arginine + water + ionic liquid) solutions.