Abstract
We report on an amperometric assay for Al(III) ions that is based on the inhibition of the enzyme α-chymotrypsin. Screen-printed carbon electrodes modified with gold nanoparticles were used as solid supports for the immobilization of the enzyme. The amperometric response of the synthetic enzyme substrate substrate N-benzoyl-L-tyrosine ethyl ester is affected by Al(III) ions, and this leads to a decrease in the amperometric oxidation current. The assay has a detection limit of 3.3 μM of Al(III). The repeatability and reproducibility of the method are 6.9% (n = 3) and 6.4% (n = 5), respectively. Main interferents include Mo(VI), W(VI) and Fe(III) ions. The method was successfully applied to the determination of Al(III) in tap water.
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Authors would like to acknowledge funding via Research Vicerrectory of Costa Rica University (Project 804-B0-051) and Spanish Ministry of Science and Innovation (TEC-2009/12029).
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Barquero-Quirós, M., Domínguez-Renedo, O., Alonso-Lomillo, M.A. et al. Biosensor for aluminium(III) based on its inhibition of α-chymotrypsin immobilized on a screen-printed carbon electrode modified with gold nanoparticles. Microchim Acta 179, 65–70 (2012). https://doi.org/10.1007/s00604-012-0864-8
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DOI: https://doi.org/10.1007/s00604-012-0864-8