Katalytische Oxidation von NADH an Graphitelektroden durch adsorbierte Phenoxazinderivate

Toluidine blue covalently immobilized onto gold electrode surfaces: An electrocatalytic system for nadh oxidation

“…Finally, process I1 can arise from TOB covalently immobilized by the formation of the amide bond with the surface-immobilized carboxylic groups [ 15,161. The substitution of the primary aromatic amino group in position 3 of TOB by an a i d e group may decrease the electron-donating properties of the nitrogen and induce a shift of the redox potential toward more positive values[31]. A similar behavior has been observed for TOB modified with P-naphthoyl and terephthaloyl chloride absorbed on graphite electrodes [ 161.…”

Raman spectroelectrochemical study of Toluidine Blue, adsorbed and electropolymerized at a gold electrode

“…The simplest and reliable technique for immobilization of azine type mediators is their adsorption at a suitable electrode like graphite. Redox dyes Nile Blue [5,6], Toluidine Blue [5,7,8], Meldola Blue [5,9,10], Coelestin Blue [11][12][13], Brilliant Cresyl Blue [5], and some others [14] have been immobilized by adsorption at graphite electrode, and used for electrocatalytic oxidation of NADH. It has been shown that a few tens of monolayers of the dye is usually adsorbed at a graphite surface [15].…”

New amperometric dehydrogenase electrodes based on electrocatalytic NADH‐oxidation at poly (methylene blue)‐modified electrodes

“…Quinones [;-lo] and quinoidic structures like phenoxazine derivatives. [11][12][13], phenazines [14][15][16], or phenothiazines [ 171 have been successfully used as efficient two-electron transfer catalysts. The catalyst layer has been usually adsorbed on the electrode surface, thus limiting the long-term stability of the related enzyme electrodes due to the leaking of the catalyst from the electrode surface.…”