Amperometric determination of ascorbic acid with a glassy carbon electrode modified with TiO2-gold nanoparticles integrated into carbon nanotubes
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A glassy carbon electrode was modified with a TiO2-gold nanoparticle hybrid integrated with multi-walled carbon nanotubes in a dihexadecylphosphate film (TiO2-Au NP-MWCNT-DHP/GCE) and applied to amperometric determination of ascorbic acid (AA). The modified sensor displays fast charge transfer and shows an irreversible anodic behavior for AA by cyclic voltammetry. Under optimal experimental conditions and using amperometry at 0.4 V, the analytical curve presented a statistical linear concentration range for AA from 5.0 to 51 μmol L−1, with a limit of detection of 1.2 μmol L−1. The electrode was successfully applied to the determination of AA in pharmaceutical and fruit juice without the need for major pretreatment of samples.
KeywordsElectrochemical sensing Modified electrode Nanostructured material Hybrid material Pharmaceuticals
The authors gratefully acknowledge financial support and scholarships from the funding agencies Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP; Grant numbers 2015/21366-9 and 2015/11452-5) and Fundação Araucária do Paraná. Special thanks to Juliane Cristina Leme for her kind help in statistical analyses.
Compliance with ethical standards
The authors declare that they have no competing interests.
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