Voltammetry of L-cysteine and 2-mercaptopyridine on a self-assembled phospholipid monolayer

R. Herrero; J. L. Barriada; M. R. MoncelliJ. M. Lopez-FonsecaM. E Sastre de Vicente

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Voltammetry of L-cysteine and 2-mercaptopyridine on a self-assembled phospholipid monolayer

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The redox behaviour of 2-mercaptopyridine and the aminoacid L-cysteine was studied through a self-assembled monolayer of dioleoylphosphatidylcholine adsorbed on mercury by using cyclic voltammetry. 2-Mercaptopyridine penetrates into monolayer in the zone of stability of the phospholipid layer and shows an quasi-reversible behaviour while reversibility is observed in the absence of a monolayer. This fact is reflected in the occurrence of voltammetric peaks in the above mentioned region of potentials. Conversely, cysteine was found not to penetrate in the lipid layer as long as the latter behaves like a half-membrane. Voltammetric signal of cysteine was only obtained when the potential was scanned to values positive to -0.2 V. Beyond this potential the cyclic voltammograms show a series of anodic peaks, due to a rearrangement of the lipid film and to the formation of Hg(RS)_2, followed by three cathodic peaks when the scan is reversal. The behaviour of these peaks was analized.

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《Journal de Chimie Physique et de Physico-Chimie Biologique》 |1999年第8期|1367-1386|共20页
作者
R. Herrero; J. L. Barriada; M. R. MoncelliJ. M. Lopez-FonsecaM. E Sastre de Vicente;
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作者单位

Departamento de Quimica Fundamental e Industrial, University of La Coruna, 15071 A Coruna, Spain;

Dipartimento di Chimica, University of Florence, 50121 Florence, ltaly;

Departamento de Quimica Fisica y Analitica, University of Oviedo, 33006 Oviedo, Spain;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
关键词
2-mercaptopyridine; L-cysteine; phospholipid monolayer on mercury; permeability model;

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Voltammetry of L-cysteine and 2-mercaptopyridine on a self-assembled phospholipid monolayer

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