Amperometric determination of ascorbic acid with a glassy carbon electrode modified with TiO2-gold nanoparticles integrated into carbon nanotubes

作者：Scremin Jessica; Melo Barbosa Eduardo Cesar; Rossi Salamanca Neto Carlos Alberto; Cury Camargo Pedro Henrique; Sartori Elen Romao^*

来源：Microchimica Acta, 2018, 185(5): UNSP 251.

DOI：10.1007/s00604-018-2785-7

• Electrochemical sensing
• Modified electrode
• Nanostructured material
• Hybrid material
• Pharmaceuticals

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 mu mol L-1, with a limit of detection of 1.2 mu mol 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.

• 出版日期2018-5