Formation of mercury-coated carbon fiber microelectrodes in aprotic media:application to the voltammetric study of vitamin K-1

The voltammetric behaviour of vitamin K-1 has been studied in aprotic media at cylindrical carbon fiber microelectrodes and Hg-coated microelectrodes. Cylindrical carbon fiber microelectrodes have proved to be effective suppo rts in order to generate Hg-coated microelectrodes in non-aqueous media and these electrodes have turned out to be fit to perform voltammetric measure ments in situ. The electroreduction of vitamin K-1 was found to be a two-st ep reaction at both types of microelectrode. The first electroreduction pro cess involves a rapid (quasi-reversible) heterogeneous single-electron tran sfer and appears to be suitable for electroanalytical purposes. (C) 1998 El sevier Science Ltd. All rights reserved.