Sensitive electrochemical detection of NADH and ethanol at low potential based on Pyrocatechol Violet (cas 115-41-3) electrodeposited on single walled carbon nanotubes-modified pencil graphite electrode
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Add time:08/28/2019 Source:sciencedirect.com
In this work, the electrodeposition of Pyrocatechol Violet (cas 115-41-3) (PCV) was initially investigated by the electrochemical surface plasmon resonance (ESPR) technique. Subsequently, PCV was used as redox-mediator and was electrodeposited on the surface of pencil graphite electrode (PGE) modified with single-wall carbon nanotubes (SWCNTs). Owing to the remarkable synergistic effect of SWCNTs and PCV, PGE/SWCNTs/PCV exhibited excellent electrocatalytic activity towards dihydronicotinamide adenine dinucleotide (NADH) oxidation at low potential (0.2 V vs. SCE) with fast amperometric response (<10 s), broad linear range (1.3–280 μM), good sensitivity (146.2 μA mM−1 cm−2) and low detection limit (1.3 μM) at signal-to-noise ratio of 3. Thus, this PGE/SWCNTs/PCV could be further used to fabricate a sensitive and economic ethanol biosensor using alcohol dehydrogenase (ADH) via a glutaraldehyde/BSA cross-linking procedure.
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