2026-05-17T11:21:23Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/43802022-04-29T12:02:47Zcom_10259_4376com_10259_5086com_10259_2604col_10259_4377

Barquero Quirós, Miriam Domínguez Renedo, Olga Alonso Lomillo, Mª Asunción Arcos Martínez, Julia acetylcholinesterase biosensor aluminum acetylthiocholine iodide screen-printed electrodes gold nanoparticles A novel amperometric biosensor for the determination of Al(III) based on the inhibition of the enzyme acetylcholinesterase has been developed. The immobilization of the enzyme was performed on screen-printed carbon electrodes modified with gold nanoparticles. The oxidation signal of acetylthiocholine iodide enzyme substrate was affected by the presence of Al(III) ions leading to a decrease in the amperometric current. The developed system has a detection limit of 2.1 ± 0.1 μM for Al(III). The reproducibility of the method is 8.1% (n = 4). Main interferences include Mo(VI), W(VI) and Hg(II) ions. The developed method was successfully applied to the determination of Al(III) in spiked tap water . The analysis of a certified standard reference material was also carried out. Both results agree with the certified values considering the respective associated uncertainties. 2017-03-20 2017-03-20 2014-05 info:eu-repo/semantics/article http://hdl.handle.net/10259/4380 eng Sensors, 2014, V. 14, n. 5, p. 8203-8216 http://dx.doi.org/10.3390/s140508203 http://creativecommons.org/licenses/by/3.0/ info:eu-repo/semantics/openAccess Attribution 3.0 Unported MDPI