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The biosensor based on the pyruvate oxidase modified conducting polymer for phosphate ions determinations

Authors :
Rahman, Md. Aminur
Park, Deog-Su
Chang, Seung-Cheol
McNeil, Calum J.
Shim, Yoon-Bo
Source :
Biosensors & Bioelectronics. Jan2006, Vol. 21 Issue 7, p1116-1124. 9p.
Publication Year :
2006

Abstract

Abstract: An enzymatic biosensor was fabricated by the covalent immobilization of pyruvate oxidase (PyO) onto the nano-particle comprised poly-5,2′:5′,2″-terthiophene-3′-carboxylic acid, poly-TTCA (nano-CP) layers on a glassy carbon electrode (GCE) for the amperometric detection of the phosphate ions. The direct electron transfer reaction of the immobilized PyO onto the nano-CP layers was investigated and the electron transfer rate constant was determined to be 0.65s−1. The electrochemically prepared nano-CP lowered the oxidation potential (+0.40V versus Ag/AgCl) of an enzymatically generated H2O2 by PyO in a phosphate solution. Experimental parameters affecting the sensitivity of the biosensors, such as amounts of the cofactors, the pH, the applied potential, and the temperature were optimized. A linear response for the detection of the phosphate ion was observed between 1.0μM and 100μM and the detection limit was determined to be about 0.3μM. The response time of the biosensors was about 6s. The biosensor showed good selectivity towards other interfering anions. The long-term storage stability of the phosphate biosensor was studied and the sensor was applied in a human serum sample for the phosphate ions detection. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
09565663
Volume :
21
Issue :
7
Database :
Academic Search Index
Journal :
Biosensors & Bioelectronics
Publication Type :
Academic Journal
Accession number :
19305214
Full Text :
https://doi.org/10.1016/j.bios.2005.04.008