Amperometric tyrosinase based biosensor using an electrogenerated polythiophene film as an entrapment support |
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Authors: | Védrine Christophe Fabiano Silvia Tran-Minh Canh |
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Institution: | ENSM-SE, 158 Cours Fauriel, 42023 Saint Etienne Cedex 2, France |
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Abstract: | An amperometric enzyme sensor using tyrosinase, also called polyphenol oxidase (PPO), was constructed for determination of phenolic compounds and herbicides. The enzyme was entrapped in a conducting polymer, poly 3,4-ethylenedioxythiophene (PEDT), electrochemically generated on a glassy carbon electrode. Several experimental parameters in the electropolymerisation process and working conditions were determined to optimise biosensor performances. Mono-phenol and di-phenol were tested in oxygenated solutions, by amperometric measurements at −200 mV (vs. SCE) in a batch system. The limit of detection of these molecules ranges from 5 to 500 nM. Detection of herbicides was obtained from the inhibition of tyrosinase electrode responses. The limit of detection for atrazine and diuron was 1 and 0.5 mg l−1 respectively. These data suggest that PEDT film is a promising PPO immobilisation method. |
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Keywords: | Conducting polymer Tyrosinase Phenolic compounds Herbicides |
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