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An Impedimetric Glucose Biosensor Based on Overoxidized Polypyrrole Thin Film
Author(s) -
Zane D.,
Appetecchi G. B.,
Bianchini C.,
Passerini S.,
Curulli A.
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201000576
Subject(s) - polypyrrole , biosensor , ionic liquid , glucose oxidase , hydrogen peroxide , dielectric spectroscopy , solvent , chemistry , materials science , electrochemistry , electrode , inorganic chemistry , nanotechnology , organic chemistry , catalysis
Polypyrrole (pPy) thin films were synthesized electrochemically by a pulse method on platinum electrodes in N ‐butyl‐ N ‐methyl‐pyrrolidinium bis(trifluoromethanesulfonyl)imide ionic liquid (PYR 14 TFSI). An important aspect of this procedure is the use of an ionic liquid, as synthetic medium. Further, it can be used for several procedures and it can then be renewed and recycled by a simple extraction just with warm water. It is therefore possible to remove it from all the residual oxidized pyrrolic compounds and purify the solvent in a very simplicistic way. After the synthesis pPy was overoxidized (opPy ) and the process was followed by EIS (Electrochemical Impedance Spectroscopy). opPy is attractive for the realization of sensors and biosensors because of its good selectivity towards hydrogen peroxide (H 2 O 2 ) with respect to the most common interferents. In particular it can find an application in food process control. The EIS response to hydrogen peroxide and biological interferents indicated opPy as a highly sensitive electrochemical platform for impedimetric sensing. The glucose oxidase enzyme (GOD) was immobilized onto the polymer and the modified electrode was assembled and tested as an impedimetric biosensor. This technique seems very promising for application in food process control.