Conductometric and Potentiometric Studies of the Association of α-Cyclodextrin with Ionic Surfactants and Their Homologs
Conductometric and Potentiometric Studies of the Association of α-Cyclodextrin with Ionic Surfactants and Their Homologs
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DOI：
10.1246/bcsj.58.2746
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发表时间：
1985-10
影响因子：
4
通讯作者：
I. Satake;T. Ikenoue;T. Takeshita;K. Hayakawa;T. Maeda
中科院分区：
文献类型：
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作者：
I. Satake;T. Ikenoue;T. Takeshita;K. Hayakawa;T. Maeda
用电导法测定了α-环糊精(α-CD)与离子表面活性剂及其同系物的结合常数。对于碳原子(N)为5-12的1-烷基磺酸根离子，缔合常数随n呈规律性增加，并在n=10时突变为常数。1-十二烷基磺酸钠、十二烷基氯化铵、十二烷基三甲基氯化铵和十二烷基氯化吡啶的缔合常数在大小上相似。通过测定反离子活度，研究了络合对十二烷基硫酸钠和十二烷基三甲基氯化铵胶束性质的影响。在这两种情况下，临界胶束浓度随着αCD浓度的增加而规则地增加，而反离子与胶束的缔合程度几乎线性地下降。认为α-CD-表面活性剂离子络合物增溶于表面活性剂胶束的亲水性表面区，从而使表面活性物质的稳定性降低。
The conductometric determination was made of the association constants of α-cyclodextrin (αCD) with ionic surfactants and their homologs. For 1-alkanesulfonate ions with carbon atoms (n) of 5–12, the association constant was found to increase regularly with n and become abruptly constant at n=10. The association constants for sodium 1-dodecanesulfonate, dodecylammonium chloride, dodecyltrimethylammonium chloride, and 1-dodecylpyridinium chloride were all similar in their magnitude. The effect of complexation on the micellar properties of sodium dodecyl sulfate and dodecyltrimethylammonium chloride were also studied potentiometrically by determining the counterion activities. In both cases, the critical micelle concentration increased regularly, while the degree of counterion association to the micelle decreased almost linearly with increasing αCD concentrations. It was suggested that the αCD-surfactant ion complex is solubilized in the hydrophilic surface region of surfactant micelle to give rise to a dec...