Dependence on pH of permeability towards electrolyte ions of poly(L-lysine-alt-terephthalic acid) microcapsule membranes.
Dependence on pH of permeability towards electrolyte ions of poly(L-lysine-alt-terephthalic acid) microcapsule membranes.
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聚(L-赖氨酸-替代对苯二甲酸)微胶囊膜的电解质离子渗透性对pH的依赖性。
DOI：
10.3109/02652049209021247
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发表时间：
1993
影响因子：
3.9
通讯作者：
T. Kondo
中科院分区：
文献类型：
--
作者：
E. Miyauchi;Y. Togawa;K. Makino;H. Ohshima;T. Kondo
研究了不同离子强度下电解质离子在聚(L-赖氨酸-对苯二甲酸)微胶囊膜中的渗透行为。PH值在4以下时，5-磺基水杨酸阴离子和苯基三甲基铵阳离子的渗透速率较慢，在4~6范围内突然大幅度增加，此后基本不变。渗透率的这种显着变化被发现是由于在相同的pH范围内观察到的微胶囊尺寸的突然增加所造成的。PH值高于6时，介质的离子强度增加，阴离子渗透速率增加，但由于盐离子对微胶囊膜中负电荷的屏蔽作用增强，阳离子渗透速率降低。
Permeation of electrolyte ions through poly(L-lysine-alt-terephthalic acid) microcapsule membranes was studied as a function of the pH of the medium at different ionic strengths. When the pH of the medium was varied, the permeation rate for 5-sulphosalicylate anions, as well as phenyltrimethylammonium cations, was slow at pH values lower than 4, showed a sudden and large increase in the pH range between 4 and 6, and thereafter remained unchanged. This remarkable change in the permeation rate was found to be produced by an abrupt increase in the microcapsule size observed in the same pH range. Increase in the ionic strength of the medium at pH values higher than 6 increased the rate of anion permeation but decreased the rate of cation permeation due to increase in the screening effect of salt ions on the negative charges in the microcapsule membranes.