Abstract
A multi-walled nanotube (MWNT) ionic liquid was prepared by the immobilization of 1-butylimidazole bromide onto an epoxy group on a poly(glycidyl methacrylate)-grafted MWNT, which was synthesized by radiation-induced graft polymerization of glycidyl methacrylate onto MWNT in an aqueous solution. Subsequently, a MWNT ionic liquid electrode was fabricated by hand-casting MWNT ionic liquid, tyrosinase, and chitosan solution as a binder on indium tin oxide (ITO) glass. The sensing ranges of the MWNT ionic liquid electrode with immobilized tyrosinase was in the range of 0.01-0.08 mM in a phosphate buffer solution. The optimal conditions such as pH, temperature, and effects of different phenolic compounds were determined. The total phenolic compounds of three commercial red wines were also determined on the tyrosinase-immobilized biosensor.
Highlights
IntroductionA great number of papers on carbon nanotube (CNT)-based sensors have been published over the past several years mainly because CNTs have the following advantages for electrochemical sensor applications: (1) small size with a large surface area, (2) high sensitivity, (3) fast response time, (4)
We fabricated an immobilized tyrosinase biosensor based on a multi-walled nanotube (MWNT) ionic liquid prepared by radiation-induced graft polymerization
The tyrosinaseimmobilized biosensor based in the MWNT ionic liquid was optimimized for pH, temperature, and other phenolic compounds
Summary
A great number of papers on carbon nanotube (CNT)-based sensors have been published over the past several years mainly because CNTs have the following advantages for electrochemical sensor applications: (1) small size with a large surface area, (2) high sensitivity, (3) fast response time, (4). Little has been reported about the introduction of ionic liquids onto an epoxy group of a grafted poly(GMA). Little has been reported regarding the easy determination of the total amount of phenolics in red wine by an electrochemical method. We synthesized poly(GMA)-grafted MWNT by RIGP of GMA in an aqueous solution in order to immobilize imidazole bromide as an ionic liquid. The sensing efficiency of the prepared MWNT ionic liquid electrode for phenol was evaluated in a phosphate buffer solution. The optimal conditions such as pH, temperature, and effects of different phenolic compounds were evaluated. Total phenolic compounds for three commercial red wines were analysed using the prepared enzyme electrode
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