Volumetric, ultrasonic and viscometric behavior of l-methionine in aqueous-glucose solutions at different temperatures

✍ Scribed by Anil Kumar Nain; Monika Lather; Rakesh Kumar Sharma

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 586 KB
• Volume: 159
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/j.molliq.2011.01.010

✦ Synopsis

Densities, ρ, ultrasonic speeds, u, and viscosities, η, of aqueous-glucose (2.5, 5, 10, 15 and 20% of glucose, w/w in water) and of solutions of L-methionine in four aqueous-glucose solvents were measured at 293.15, 298.15, 303.15, 308.15, 313.15, and 318.15 K. From these experimental data, apparent molar volume, V ϕ limiting apparent molar volume, V °ϕ and the slope, S v , apparent molar compressibiliity, K s,ϕ , limiting apparent molar compressibility, K °s,ϕ and the slope, S k , transfer volume, V °ϕ,tr , transfer compressibility, K °s,ϕ,tr , Falkenhagen coefficient, A, Jones-Dole coefficient, B, free energy of activation of viscous flow per mole of solvent, Δ μ 1 °# and per mole of solute, Δμ 2 °# were calculated. The results are interpreted in terms of solute-solvent and solutesolute interactions in these systems. It is observed that there exist strong solute-solvent interactions in these systems, which increase with increase in glucose concentration. It is observed that L-methionine act as structure-breaker in aqueous-glucose solvents. The thermodynamics of viscous flow has also been discussed.