期刊
ELECTROANALYSIS
卷 25, 期 3, 页码 741-749出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201200574
关键词
Biosensors; Functionalized polypyrrole; Conducting polymers
资金
- Brazilian agency FAPESP
- Brazilian agency CNPq
- Brazilian agency CAPES [507/05]
The process for obtaining polypyrrole-2-carboxylic acid (PPY-2-COOH) films in acetonitrile was investigated using cyclic voltammetry, electrochemical quartz crystal microgravimetry (EQCM), and infrared spectroscopy (FTIR). Different potential ranges were applied during cyclic voltammetry experiments with the aim of obtaining films without and with the presence of controlled amounts of water added in acetonitrile. The FTIR spectra of the films have evidenced that cations and anions from the electrolyte solution were incorporated into the PPY-2-COOH structure, with a preferential adsorption of cations. After chemically immobilizing polyphenoloxidase (tyrosinase, PPO), PPY-2-COOH/PPO films were build for amperometric detection of catechol, establishing a linear limit of concentrations ranging from 5.0x104 to 2.5x102molL1.
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