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Cyclic Voltammetry of Two Analogue K-Group Vitamin Compounds in Dimethylsulfoxide

✍ Scribed by Felipe J. González

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 103 KB
Volume: 10
Category: Article
ISSN: 1040-0397
DOI: 10.1002/(sici)1521-4109(199807)10:9<638::aid-elan638>3.0.co;2-r

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✦ Synopsis

The electrochemical reduction of two analogue K-group vitamin compounds, menadione and phthiocol, was studied by cyclic voltammetry in DMSO on glassy carbon electrodes. The reduction process of the more biologically active of these compounds (menadione), is associated with the formation of the semiquinone anion radical and the dianion. Two separated reversible one-electron peaks were observed. In contrast, the less biologically active phthiocol exhibits a single irreversible 2/3-electron peak which is explained by an ECE-DISP1 self-protonation mechanism. In the presence of a donor proton such as benzoic acid, menadione and phthiocol are reduced both through a sequence of consecutive electron transfer and protonation reactions occurring via an irreversible two-electron ECE-DISP1 mechanism.

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