化学学报 ›› 2011, Vol. 69 ›› Issue (08): 875-880. 上一篇    下一篇

研究论文

基于等温滴定量热法表征的红细胞凝集反应热动力学特性研究

任永申1,2,鄢丹*,1,张萍1,冯雪1,谭曼容1,肖小河*,1   

  1. (1解放军302医院 解放军中药研究所 北京 100039)
    (2成都中医药大学药学院 成都 610075)
  • 投稿日期:2010-09-09 修回日期:2010-11-21 发布日期:2010-12-06
  • 通讯作者: 任永申 E-mail:godreny@163.com
  • 基金资助:

    国家自然科学基金项目;国家“重大新药创制”科技重大专项

Investigation on the Thermokinetics Process of Hemoagglutination by Isothermal Titration Calorimetry

Ren Yongshen1,2 Yan Dan*,1 Zhang Ping1 Feng Xue1 Tan Manrong1 Xiao Xiaohe*,1   

  1. (1 China Military Institute of Chinese Materia Medica, 302 Military Hospital of China, Beijing 100039)
    (2 Chengdu University of Traditional Chinese Medicine, Chengdu 610075)
  • Received:2010-09-09 Revised:2010-11-21 Published:2010-12-06
  • Contact: Yong-shen REN E-mail:godreny@163.com

采用等温滴定量热法研究植物凝集素(PHA)作用于20%家兔血红细胞(RBC)的凝集反应过程, 以生物热动力学参数表达凝集反应动力学特征. 结果表明, PHA与家兔血红细胞凝集反应的平衡常数K为3.24×105 L•mol-1, 反应焓变( )为-238.548 kJ•mol-1, 反应自由能( )为-32.722 kJ•mol-1, 反应熵变( )为-0.664 kJ•mol-1•K-1. 反应为放热反应(Q>0), 可自发进行(ΔG<0), 反应为焓驱动、熵减过程(ΔH<0, ΔS<0, |ΔH|>|TΔS|), 由化学键合作用、氢键和范德华力推动, 反应体系最终处于稳定有序状态. 所建立的微量量热法可以客观表征凝集反应的热动力学过程, 也为其他抗原抗体类型反应的过程评价方法提供新的技术参考.

关键词: 等温滴定量热法, 红细胞, 植物凝集素, 凝集反应, 热动力学

Microcalorimetry was adopted to detect the reaction of phytohemagglutinin (PHA) with 20% rabbit red blood cell (RBC), thermokinetics curves and parameters were obtained, so as to evaluate agglutinate activity of PHA objectively from reaction process and thermokinetics character aspect. The results showed that thermokinetics parameters of PHA titrated with 20% rabbit RBC were: K (3.24×105 L•mol-1) (-32.722 kJ•mol-1), (-238.548 kJ•mol-1), (-0.664 kJ•mol-1•K-1). The hemoagglutination is exothermic reaction for Heat>0, and it could progress spontaneously for Gibbs free energy was negative (ΔG<0), and the reaction was entropy decreasing and driven by enthalpy (ΔH<0, ΔS<0, |ΔH|>|TΔS|), the driving force may be chemical bonding force, Van der Waals force and hydrogen bond interaction, the reaction system kept in stable and ordered condition after agglutination. In conclusion, the admix ampoule microcalorimetry established in this study could be adopted as an effective technique for sensitive, precise, quantitative and consecutive detection of hemoagglutination and other antigen-antibody reactions.

Key words: isothermal titration calorimetry, red blood cell, phytohemagglutinin, agglutination, thermokinetics

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