Acta Chimica Sinica ›› 1983, Vol. 41 ›› Issue (1): 41-47. Previous Articles     Next Articles

Original Articles

生化模型化合物的热化学研究 I.L(+)-天氡氨酸和L(+)-谷氨酸在水中的低浓度溶解焓

倪锡荣;胡日恒   

  1. 中国科学院化学研究所
  • 出版日期:1983-01-15 发布日期:1983-01-15

Thermochemical study of biochemical model compounds i. The enthalpies of solution of l(+)-aspartic acid and l (+)- glutamic acid in water at low concentration.

NI XIRONG;HU RIHENG   

  • Online:1983-01-15 Published:1983-01-15

It has been found that an ordinary reaction calorimeter can be used for the determination of small heat effects (10^-^3 to 10^-^4 C temperature change) by correctly evaluating the Newton's cooling constant K through a reference temperature technique. This technique was applied to the determination of the integral enthalpies of solution of L(+)-aspartic acid and L(+)-glutamic acid in water in the concentration range of 10^-^3 to 10^-^4 mol/kg which were found equal to 25.8+/-0.6 and 25.7+/-0.4kJ/mol respectively (twice standard deviation). No CH2 increment effect has been revealed in the solution enthalpies of these two amino-acids.

Key words: DETERMINATION, SOLUBILITY, GLUTAMIC ACID, ASPARTIC ACID, ENTHALPY, THERMOCHEMICAL PROPERTY

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