Effects of nonionic surfactants on electrochemical behavior of ubiquinone and menaquinone incorporated in a carbon paste electrode.
A carbon paste electrode, in which the carbon particles were coated with a thin layer of a nonionic surfactant (NIS), was constructed with a pasting liquid containing ubiquinone (UQ) or menaquinone (MQ). It has revealed that the layer acts not only as a diffusion barrier but also as a matrix for the redox reaction of quinones at electrode surface, and its effects on the electrochemical behavior of quinones depend on both the physico-chemical structure of a surfactant and the kind of quinones. Further, such a modification was applied to the preparation of an enzyme electrode in which the quinone molecule act as a redox mediator and the influences on the sensitivity of the glucose biosensor was demonstrated.
Kawakami
M
M
Department of Functional Materials Engineering, Faculty of Engineering, Fukuoka Institute of Technology, Japan. kawakami@emat.fit.ac.jp
Tanaka
K
K
Uriuda
N
N
Gondo
S
S
D002244:Carbon; D004563:Electrochemistry; D004566:Electrodes; D013501:Surface-Active Agents / Q000494:pharmacology*; D014451:Ubiquinone / Q000737:chemistry*; D014812:Vitamin K / Q000737:chemistry*
D013501:Surface-Active Agents; D014812:Vitamin K; D014451:Ubiquinone; D002244:Carbon