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Citation: Yao Song-Nian, Cao Lian-Xin, Pan Dong-Jun. Two Thermodynamic Constants in the Lecithin-H₂O Order System[J]. Acta Physico-Chimica Sinica, ;1993, 9(05): 713-718. doi: 10.3866/PKU.WHXB19930528 shu

Two Thermodynamic Constants in the Lecithin-H₂O Order System

1.
The Center of Anaiysis and Test in Wuhan University, Wuhan 430072; Tian-Ma Micro-electoronics Co. in Shenzhen, Shenzhen 518041

Received Date: 10 March 1992
Available Online: 15 October 1993

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.
- Order molecular system; Egg yolk phospholipid; Formation constant of Ca-ATP; The product of solubility of CaCO₃
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Two Thermodynamic Constants in the Lecithin-H2O Order System

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Two Thermodynamic Constants in the Lecithin-H₂O Order System