Rezaeva M N, Khomutov G B, Tverdislov V A, Tikhonov A N
Biofizika. 1985 Nov-Dec;30(6):1008-10.
Action of monovalent cations on phospholipid liposome surface properties was studied using hydrophobic spin labels. Addition of monovalent cations to liposome incubation media led to an increase of the partition coefficient of negatively charged I1,14 spin label in the membrane, but produced an opposite effect in the partition coefficient of positively charged CAT12 spin label. The effect increased with cation concentration in series of NH4+ greater than Li+ greater than Na+ greater than K+ greater than or equal to Rb+ greater than or equal to Cs+. The result is explained by the thermodynamics of cation hydration and quantum effects of cation interaction with specifically ordered ligands.
使用疏水自旋标记研究了单价阳离子对磷脂脂质体表面性质的作用。向脂质体孵育介质中添加单价阳离子导致带负电荷的I1,14自旋标记在膜中的分配系数增加，但对带正电荷的CAT12自旋标记的分配系数产生相反的影响。在NH4+＞Li+＞Na+＞K+≥Rb+≥Cs+系列中，该效应随阳离子浓度的增加而增强。该结果由阳离子水合热力学以及阳离子与特定有序配体相互作用的量子效应来解释。
