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Sensors 2016, 16(10), 1588; doi:10.3390/s16101588

Effect of Nanoparticles on Modified Screen Printed Inhibition Superoxide Dismutase Electrodes for Aluminum

1
Department of Chemistry, University of Costa Rica, CELEQ, San Pedro de Montes de Oca, San José 11501-2060, Costa Rica
2
Department of Chemistry, Faculty of Sciences, University of Burgos, Plaza Misael Bañuelos s/n, Burgos 09001, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Roberto Pilloton
Received: 26 July 2016 / Revised: 10 September 2016 / Accepted: 20 September 2016 / Published: 26 September 2016
(This article belongs to the Special Issue Amperometric Biosensors)
View Full-Text   |   Download PDF [5291 KB, uploaded 26 September 2016]   |  

Abstract

A novel amperometric biosensor for the determination of Al(III) based on the inhibition of the enzyme superoxide dismutase has been developed. The oxidation signal of epinephrine substrate was affected by the presence of Al(III) ions leading to a decrease in its amperometric current. The immobilization of the enzyme was performed with glutaraldehyde on screen-printed carbon electrodes modifiedwith tetrathiofulvalene (TTF) and different types ofnanoparticles. Nanoparticles of gold, platinum, rhodium and palladium were deposited on screen printed carbon electrodes by means of two electrochemical procedures. Nanoparticles were characterized trough scanning electronic microscopy, X-rays fluorescence, and atomic force microscopy. Palladium nanoparticles showed lower atomic force microscopy parameters and higher slope of aluminum calibration curves and were selected to perform sensor validation. The developed biosensor has a detection limit of 2.0 ± 0.2 μM for Al(III), with a reproducibility of 7.9% (n = 5). Recovery of standard reference material spiked to buffer solution was 103.8% with a relative standard deviation of 4.8% (n = 5). Recovery of tap water spiked with the standard reference material was 100.5 with a relative standard deviation of 3.4% (n = 3). The study of interfering ions has also been carried out. View Full-Text
Keywords: superoxide dismutase biosensor; aluminum; tetrathiofulvalene; screen-printed electrodes; nanoparticles superoxide dismutase biosensor; aluminum; tetrathiofulvalene; screen-printed electrodes; nanoparticles
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Barquero-Quirós, M.; Arcos-Martínez, M.J. Effect of Nanoparticles on Modified Screen Printed Inhibition Superoxide Dismutase Electrodes for Aluminum. Sensors 2016, 16, 1588.

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