物理化学学报 >> 1993, Vol. 9 >> Issue (05): 713-718.doi: 10.3866/PKU.WHXB19930528

研究简报 上一篇    

水-卵磷脂有序体中的两个热力学常数

姚松年; 曹连欣; 潘东俊   

  1. 武汉大学分析测试中心，武汉 430072；深圳天马微电子公司，深圳 518041
  • 收稿日期:1992-03-10 修回日期:1992-12-07 发布日期:1993-10-15
  • 通讯作者: 姚松年

Two Thermodynamic Constants in the Lecithin-H2O Order System

Yao Song-Nian; Cao Lian-Xin; Pan Dong-Jun   

  1. The Center of Anaiysis and Test in Wuhan University, Wuhan 430072; Tian-Ma Micro-electoronics Co. in Shenzhen, Shenzhen 518041
  • Received:1992-03-10 Revised:1992-12-07 Published:1993-10-15
  • Contact: Yao Song-Nian

PDF

3076

赞

关键词: 有序体, 卵磷脂, Ca-ATP生成常数, 碳酸钙的溶度积

Abstract: Association constants of the complexes CaATP~(2-) and Ca_2ATP, K_1, K_2 and the product of solubility of CaCO_3, K_(sp), in the lecithin-water order system (PC-H_2O) have been measured by potentionmeter using a calcium ion selection membrance electrode. We have observed that formation constant of the complex CaATP~(2-), K_1, in the PC-H_2O order system is larger about an order of magnilude than K_1 in the H_2O, and K_1 (PC-H_2O) increases with the concentration of phospholipid in the PC-H_2O system. But the rate of increase of the K_1(PC-H_2O) is reduced with the increase of the concentration of the lecithin beyend(cmc). However, the formation constant of Ca_2ATP, K_2, does not change obviously in the process of increasing [PC]. When [PC]>[cmc], the K_(sp)(PC-H_2O) of CaCO_3 in the PC-H_2O system is larger than K_(sp)(H_2O) of CaCO_3 in the water. It illustrates that the solubility of CaCO_3 is increased in the liguid crystal order system.
It is expected that the liquid crystal state in biological body is favorable for the absorbtion of calcium.

Key words: Order molecular system, Egg yolk phospholipid, Formation constant of Ca-ATP, The product of solubility of CaCO3