高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (1): 31.

• 论文 • 上一篇    下一篇

蔗糖水解反应速率常数的毛细管电泳测定方法研究

叶建农, 金薇, 赵学伟, 方禹之   

  1. 华东师范大学化学系, 上海, 200062
  • 收稿日期:1996-12-11 出版日期:1998-01-24 发布日期:1998-01-24
  • 通讯作者: 叶建农,男,50岁,博士,教授.
  • 作者简介:叶建农,男,50岁,博士,教授.
  • 基金资助:

    中国科学院长春应用化学研究所电分析化学开放实验室资助课题.

Studies of the Rate Constant of Sucrose Hydrolysis by Capillary Electrophoresis with Electrochemical Detection

YE Jlan-Nong, JIN Wei, ZHAO Xue-Wei, FANG Yu-Zhi   

  1. Department of Chemistry, East China Normal University, Shanghai, 200062
  • Received:1996-12-11 Online:1998-01-24 Published:1998-01-24

摘要: 利用具有高分辨率和高灵敏度的毛细管电泳-电化学检测方法直接测定蔗糖及其水解产物的浓度随反应时间变化的规律.在HCl催化下,对不同温度时蔗糖的水解反应速率常数进行了测定,并求得反应活化能Ea为109.8kJ/mol.该方法比经典的旋光度测定方法更直观简便,结果令人满意.

关键词: 毛细管电泳, 电化学检测, 蔗糖, 水解反应速率常数

Abstract: The concentrations of sucrose and its hydrolysis products were directly monitored by capillary electrophoresis-electrochemical detection due to its high resolution and high sensitivity of detection. The rate constants of sucrose hydrolysis at different temperatures in 0.80 mol/L HCl and 0. 90 mol/L HCl were obtained from the concentration change of sucrose during the process of hydrolysis. At 25℃, 30℃ and 35 ℃, the measured rate constants of sucrose hydrolysis were 7. 81×10-3 min-1, 17. 44×10-3 min-1 and 33. 09×10-3 min-1 in 0. 80 mol/L HCl, and 11.18×10-3 min-1, 27. 32×10-3 min-1 and 44. 86×10-3 min-1 in 0. 90 mol/L HCl, respectively, from which the Ea value of 109. 85 kJ/mol was derived. Compared with the traditional polarimetric method, this method is more visualizable and convenient with satisfactory results.

Key words: Capillary electrophoresis, Electrochemical detection, Sucrose, Hydrolysis rate constant

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