Journal
ELECTROCHEMISTRY
Volume 85, Issue 1, Pages 17-22Publisher
ELECTROCHEMICAL SOC JAPAN
DOI: 10.5796/electrochemistry.85.17
Keywords
Tyrosinase; Thionine; Electrodeposition; Catechol
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Funding
- Education of Liaoning province [L2014117]
- youth fund of University of Science and Technology, Liaoning
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A stepwise strategy of mediator-free amperometric biosensor for the detection of catechol was developed based on the covalent bonding of tyrosinase (TYR) onto thionine (TN)-electrodeposited glassy carbon (GC) surface via glutaraldehyde (GA). Prior to the TYR-immobilization, poly(thionine) was prepared on a GC electrode surface by an electrooxidative polymerization of thionine. The TYR/GA/pTN modified electrode was evaluated by SEM and EIS measurements. The terminal amino groups (-NH2) which electrodeposited on the GC surface were cross-linked with protein lysine group (or cysteine group) by GA. The resulting TYR/GA/pTN-immobilized GCE was utilized as a working electrode unit of a catechol-detect biosensor. Catechol was used as model analyte for the evaluation of catecholase activity, and the signal based on the electro-reduction of the enzymatically produced o-quinone species were monitored at -0.05V vs. Ag/AgCl. The resulting TYR/GA/pTN/GCE biosensor exhibited rapid and sensitive response to catechol (100% response time: approximate to 5s, sensitivity: 5.04 mu A/mM, detection limit: 6.0 mu M. The TYR/GA/pTN/GCE retained 71% of original activity for catechol oxidation after 1 month storage. (C) The Electrochemical Society of Japan, All rights reserved.
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