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

Author(s)

Scremin, Jessica ^[1] ; Melo Barbosa, Eduardo Cesar ^[2] ; Rossi Salamanca-Neto, Carlos Alberto ^[1] ; Cury Camargo, Pedro Henrique ^[2] ; Sartori, Elen Romao ^[1]

Affiliation

^[1] Univ Estadual Londrina, Dept Quim, Ctr Ciencias Exatas, Rodovia Celso Garcia Cid, PR 445 Km 380, CP 10-011, BR-86057970 Londrina - Brazil

^[2] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Microchimica Acta; v. 185, n. 5 MAY 2018.
• Web of Science Citations: 5

Abstract

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. (AU)

• FAPESP's process: 15/21366-9 - HYBRID MATERIALS CONTAINING METAL NANOPARTICLES FOR CATALYTIC APPLICATIONS
• Grantee: Pedro Henrique Cury Camargo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 15/11452-5 - Hybrid materials composed of oxides and metallic nanoparticles for catalytic and photocatalytic applications
• Grantee: Eduardo César Melo Barbosa
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)