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Corresponding Author

Takeo Ohsaka and

Abstract

A New type of dehydrogenase-based amperometric ethanol biosensor was constructed using alcohol dehydrogenase (ADH) which was immobilized on the edge-plane pyrolytic graphite (EPPG) electrode modified with poly(phenosafranin)-functionalized single-walled carbon nanotube (PPS-SWCNT). The PPS-SWCNT modified EPPG electrode was prepared by electropolymerization of phenosafranin on the EPPG electrode which was previously coated with SWCNT. The performance of the ADH/PPS-SWCNT/EPPG electrode was evaluated using cyclic voltammetry and amperometry in the presence of ethanol. The fabricated ethanol biosensor provided a reasonable sensitivity of 2.0 μA cm–2 mM–1 and a low detection limit (36 μM) for the electrocatalytic oxidation of ethanol with a linear concentration dependence upto ~ 1.0 mM at a detection potential of 0.2 V.

Graphical Abstract

Keywords

Phenosafranin, electropolymerization, NADH, SWCNT, electrocatalysis

Publication Date

2011-08-28

Online Available Date

2011-07-20

Revised Date

2011-07-11

Received Date

2011-06-07

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