物理化学学报 >> 1999, Vol. 15 >> Issue (07): 662-667.doi: 10.3866/PKU.WHXB19990716

研究简报 上一篇    下一篇

α-氨基酸在丁酸钠水溶液中的体积性质(308.15K)

颜振宁, 成庆堂, 王键吉, 刘大壮   

  1. 天津大学化工系,天津 300072;河南师范大学化学系,新乡 453002|郑州工业大学化工系,郑州 450002
  • 收稿日期:1998-10-15 修回日期:1999-02-09 发布日期:1999-07-15
  • 通讯作者: 王键吉

The Volumetric Properties of Some α-Amino Acids in Aqueous Sodium Butyrate Solutions at 308.15K

Yan Zhen-Ning, Cheng Qing-Tang, Wang Jian-Ji, Liu Da-Zhuang   

  1. Department of Chemical Engineering,Tianjin University,Tianjian 300072|Department of Chemistry,Henan Normal University,Xinxiang 453002;Department of Chemical Engineering,Zhengzhou University of Technology,Zhengzhou 450002
  • Received:1998-10-15 Revised:1999-02-09 Published:1999-07-15
  • Contact: Wang Jian-Ji

关键词: 密度, 标准偏摩尔体积, α-氨基酸, 丁酸钠水溶液

Abstract:

Density data have been reported for glycine, DL-α-alanine, DL- α-amino-n-butyric acid, DL-valine and DL-leucin in aqueous solutions of 0. 5, 1. 0, 1. 5 and 2. 0 mol. kg - 1 sodium butyrate at 308. 15 K. The apparent molar volums V2,? and standard partial molar volumes V2,?Θ for the amino acids in aqueous sodium butyrate solutions have been calculated. The linear correlation between V2 and the number of carbon atoms in the alkyl chain of the amino acids has been observed and utilized to estimate the contributions of the charged end groups (NH3+, COO- ), CH2 group and other alkyl chains of the nmino acids to V2,?Θ. The results show that values for ( COO- ) increase, while those for CH2 decrease, with sodium butyrate concentration-.The hydration number of the amino acids decreases With increasing electrolyte concentrations. These phenomena are discussed by means of the dehydration effect of electrolyte on the amino acids.

Key words: Density, Standard partial molar volume, α-amino acid, Aqueous sodium butyrate solutions