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Título : Effect of Nanoparticles on Modified Screen Printed Inhibition Superoxide Dismutase Electrodes for Aluminum
Autor : Barquero Quirós, Miriam
Arcos Martínez, Julia
Publicado en: Sensors, 2016, V. 16, n. 10, art. 1588
Editorial : MDPI
Fecha de publicación : oct-2016
ISSN : 1424-8220
Resumen : 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 Mfor 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.
Palabras clave: superoxide dismutase biosensor
aluminum
tetrathiofulvalene
screen-printed electrodes
nanoparticles
URI : http://hdl.handle.net/10259/4378
Versión del editor: http://dx.doi.org/10.3390/s16101588
Aparece en las colecciones: Artículos ELAN

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