title: Viscosity behavior of some alpha-amino acids and their groups in water-sodium acetate mixtures.
abstract: Viscosities of glycine, DL-alpha-alanine, DL-alpha-amino-n-butyric acid, DL-valine and DL-leucine have been determined in water-sodium acetate mixtures at 298.15 and 308.15 K. The viscosity B-coefficients have been calculated. The corresponding activation free energies (Deltamu(2)(0 not equal )) for viscous flow have been evaluated with the help of the Feakins equation. The contributions of the charged end group (NH(3)(+),COO(-)) and CH(2) groups of the amino acids to B-coefficient and Deltamu(2)(0 not equal) have been also determined using the linear correlation between B-coefficient or Deltamu(2)(0 not equal) and the number of carbon atoms in alkyl chains of the amino acids. The results have been interpreted in the light of the solute-solvent interactions in aqueous media.
authors.affiliation: Department of Chemistry, Zhengzhou University, Zhengzhou, Henan 450052, PR China.
authors.forename: Zhenning
authors.initials: Z
authors.lastname: Yan
authors.forename: Jianji
authors.initials: J
authors.lastname: Wang
authors.forename: Jinsuo
authors.initials: J
authors.lastname: Lu
mesh_terms: D000465:Algorithms; D000596:Amino Acids / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D019346:Sodium Acetate / Q000737:chemistry*; D013816:Thermodynamics; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D000596:Amino Acids; D014867:Water; D019346:Sodium Acetate