Electrodes modified with a film of phosphatidylcholine: electrochemistry inside a lipid layer
Electrodes modified with a film of phosphatidylcholine: electrochemistry inside a lipid layer
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用磷脂酰胆碱膜修饰的电极：脂质层内的电化学
DOI：
10.1021/ac00184a012
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
A. Kaifer
中科院分区：
文献类型：
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作者：
Orlando García;P. Quintela;A. Kaifer
本文介绍了用磷脂酰胆碱（PC）铸膜修饰玻碳电极的初步研究结果。氧化还原活性的两亲物从接触的水溶液中提取到浇铸脂质层中，在那里它们与下面的电极表面发生电化学反应。一旦脂质层负载有电活性两亲性材料，电极就可以转移到纯的支持电解质溶液中，同时保留电活性。相比之下，亲水性的电活性基底被PC层保持远离电极表面，这在很大程度上阻止了与电极的电子转移反应的观察。在这篇文章中，我们报道了被一层磷脂酰胆碱（PC）覆盖的电极表面的特殊电化学行为。氧化还原活性的两亲物容易从接触的水溶液分配到该脂质层中，并在电极表面经历电化学反应。相比之下，这些电活性化合物的更亲水的形式被脂质层排斥，从而防止它们与电极的电子转移反应。有几个小组正在积极研究用疏水材料衍生的电极表面的性质。一
Preliminary results on the behavior of glassy carbon elec-trodes modified by cast layers of phosphatidylcholine (PC) are presented. Redox-active amphiphiles are extracted from a contacting aqueous solution Into the cast lipid layer where they undergo electrochemical reactions with the underlying electrode surface. Once the lipid layer Is loaded with electroactive amphiphilic material, the electrode can be transferred to pure supporting electrolyte solutions with retention of theelectroactivity. In contrast, hydrophilic electroactive substrates are kept away from the electrode surface by the PC layer largely preventing the observation of electron transfer reactions with the electrode.In this communication we report the peculiarelectrochemical behavior of electrode surfaces covered by a layer of phosphatidylcholine (PC). Redox-active amphiphiles readily partition into this lipid layer from a contacting aqueous so-lution and undergo electrochemical reactions at the electrode surface. In contrast, more hydrophilic versions of these electroactive compounds are rejected by the lipid layer pre-venting their electron transfer reactions with the electrode. Several groups are actively investigating the properties of electrode surfaces derivatized with hydrophobic materials. A
Koichi TOKUDA：“电极表面单层吸附物质的两步一步电子转移氧化还原电极反应理论”
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