期刊
BIOELECTROCHEMISTRY
卷 101, 期 -, 页码 58-65出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2014.07.005
关键词
PtNps; GCNF; Lactate biosensor; Screen printing electrodes; Beverages
资金
- ENIAC JOINT UNDERTAKING-Nanoelectronics for Mobile Ambient Assisted Living (AAL) Systems Project [12 02 28]
- DGI of MICINN (Torres Quevedo Program) [PTQ-11-04404]
This work describes the fabrication of a new lactate biosensor. The strategy is based on the use of a novel hybrid nanomaterial for amperometric biosensors i.e. platinum nanoparticles (PtNps) supported on graphitized carbon nanofibers (PtNps/GCNF) prepared by chemical reduction of the Pt precursor at GCNF surfaces. The biosensors were constructed by covalent immobilization of lactate oxidase (LOx) onto screen printed carbon electrodes (SPCEs) modified with PtNps (PtNps/GCNF-SPCEs) using polyethyleneimine (PEI) and glutaraldehyde (GA). Experimental variables concerning both the biosensor design and the detection process were investigated for an optimal analytical performance. Lactate biosensors show good reproducibility (RSD 4.9%, n = 10) and sensitivity (41,302 +/- 546) mu A/M cm(2), with a good limit of detection (6.9 mu M). Covalent immobilization of the enzyme allows the reuse of the biosensor for several measurements, converting them in a cheap alternative to the solid electrodes. The long-term stability of the biosensors was also evaluated. 90% of the signal was kept after 3 months of storage at room temperature (RT), while 95% was retained after 18 months at -20 degrees C. These results demonstrate that the method provides sensitive electrochemical lactate biosensors where the stability of the enzymatic activity can be preserved for a long period of time in adequate storage conditions. (C) 2014 Elsevier BY. All rights reserved.
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