Covalently immobilized choline oxidase and cholinesterases on a methacrylate copolymer for disposable membrane biosensors |
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Authors: | Lucio Doretti Paola Gattolin Anna Burla Daniela Ferrara Silvano Lora Giancarlo Palma |
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Affiliation: | (1) Ufficio Sicurezza e Prevenzione del CNR, Corso Stati Uniti 4, 35127 Padova, Italy;(2) Sezione di Legnaro, Istituto di Fotochimica e Radiazioni d’Alto Energia del CNR, via Romea 4, 35020 Legnaro (Padova), Italy;(3) Dipartimento di Chimica Fisica, Università di Podova, Via Loredan 4, 35131 Padova, Italy |
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Abstract: | Bienzymatic sensors for the determination of esters of choline were prepared by covalent co-immobilization of cholinesterases and choline oxidase on polymer membranes, obtained by radiation-induced copolymerization of 2-hydroxyethyl methacrylate and glycidyl methacrylate at low temperature. Optimization of the covalent attachment of choline oxidase and acetyl-or butyrylcholinesterase to copolymer was explored. The enzyme-modified polymers were applied on platinum electrodes to form amperometric sensors, based on the electrochemical detection of enzymatically developed hydrogen peroxide. Acetyl-, acetylthiobutyryl-, and butyrylthiocholine contents in standard solutions were measured, and linear calibration curves were determined. Temperature and pH effects on the electrochemical response are described. |
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Keywords: | Biosensors acetylcholinesterase butyrylcholinesterase choline oxidase covalent immobilization radiation induced polymerization |
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