Chowdhry B Z, Lipka G, Dalziel A W, Sturtevant J M
Biophys J. 1984 Mar;45(3):633-5. doi: 10.1016/S0006-3495(84)84202-2.
Interaction of lanthanum ions (La3+) with 1,2 dipalmitoyl-sn-glycero-3-phosphorylcholine (DPPC) causes an increase in Tc, the temperature of maximal excess heat capacity, and the width of the gel-to-liquid crystalline transition. At a mole ratio of La3+ to DPPC sufficient to remove the hydrocarbon chain tilt angle of DPPC, the changes in the thermodynamic parameters of the pretransition are minor, Tc and the width were unaltered and the enthalpy was reduced by only 10%. This suggests that the change in tilt angle is not a necessary concomitant of the pretransition.
镧离子(La3+)与1,2 - 二棕榈酰 - sn - 甘油 - 3 - 磷酸胆碱(DPPC)的相互作用会导致Tc(最大过剩热容量出现时的温度)升高,以及凝胶态到液晶态转变的宽度增加。当La3+与DPPC的摩尔比足以消除DPPC的烃链倾斜角时,预转变的热力学参数变化较小,Tc和宽度未改变,焓仅降低了10%。这表明倾斜角的变化并非预转变必然伴随的现象。