Acta Chimica Sinica ›› 2000, Vol. 58 ›› Issue (10): 1240-1246. Previous Articles     Next Articles

Original Articles

水溶液中八种氨基酸与尿素的焓相互作用

邵爽;胡新根;林瑞森   

  1. 浙江大学化学系.杭州(310027)
  • 出版日期:2000-10-15 发布日期:2000-10-15

The enthalpic interactions between eight kinds of amino acid and urea in aqueous solutions at 298.15K

Shao Shuang;Hu Xingen;Lin Ruisen   

  1. Zhejiang Univ, Dept Chem.Hangzhou(310027)
  • Online:2000-10-15 Published:2000-10-15

The enthalpies of mixing of aqueous urea solutions and eight kinds of aqueous amino acid solutions (glycine, L-alanine, l-serine, L- proline, L-hydroxyproline, L-methionine, L-threonine and L-valine) have been determined at 298.15K by LKB-2277 flow microcalorimetric system. The data have been analyzed in terms of the McMillan-Mayer formalism to obtain the enthalpic virial coefficients for heterotactic interactions. The pairwise interactions between amino acids and urea have been studied by a group contribution additivity aproach. the results show that the zwitterionic groups and different side-groups of the amino acids, such as non-polar alkyl groups, hydroxy group and five-membered pyrolidine ring, make their different contributions to enthalpic pair interactions.

Key words: AMINO ACID, UREA, ENTHALPY, INTERACTIONS, GLYCINE, ALANINE, SERINE, PROLINE, GROUP CONTRIBUTION

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