Korreman S S, Posselt D
Department of Mathematics and Physics (IMFUFA), Roskilde University, Denmark.
Eur Biophys J. 2001;30(2):121-8. doi: 10.1007/s002490000125.
By use of small-angle X-ray scattering it is shown that addition of alkali halide salts in small amounts (0-200 mM) shifts the repeat spacing in multilamellar DC13PC vesicles and alters the anomalous swelling behaviour close to the main transition. Both effects follow the Hofmeister series of the ions. We suggest that the shift of repeat spacing can be explained by ion effects on the van der Waals attractive forces between the membranes and on the decay length of the repulsive hydration force. The anomalous swelling is explained in terms of a critical unbinding of the membranes. The proximity of the critical temperature of the unbinding to the main transition temperature can be tuned by varying the concentration and type of salt in the sample.
通过小角X射线散射表明，少量（0 - 200 mM）碱金属卤化物盐的添加会改变多层DC13PC囊泡中的重复间距，并改变接近主要转变时的异常膨胀行为。这两种效应都遵循离子的霍夫迈斯特序列。我们认为，重复间距的变化可以通过离子对膜间范德华吸引力以及排斥水化力衰减长度的影响来解释。异常膨胀是根据膜的临界解离来解释的。通过改变样品中盐的浓度和类型，可以调节临界解离温度与主要转变温度的接近程度。
