Construction of a New Sensor with Ruthenium Complex Anchored in Functionalized Silica and Their Application in Determination of Ascorbic Acid in Industrial Fruit Juice

Mauricio Guilherme Vieira

doi:10.11648/j.ijssn.20170502.12

Abstract

The chemically modified silica gel with 3-aminopropyltrimethoxysilane groups and EDTA was used to immobilize ruthenium complex initially. These materials were incorporated into a carbon paste electrode and its electrochemical properties were investigated. However, for ascorbic acid solution, an enhancement of the anodic peak current was detected due to electrocatalytic oxidation. The electrodes presented good repeatability, stability and reproducible. The sensors were applied in ascorbic acid determination in industrial fruit juice with success.

Highlights

The development of chemically modified electrodes (CME) and their application in electroanalytical techniques have been extensively revised [1, 2]
SF-3APTS/EDTA/Ru(EDTA) Sílica Cyclic voltammetric experiments using a carbon paste electrode modified with the material were carried out
A cyclic voltammetric curve for a carbon paste electrode prepared with SF-3APTS/EDTA having complexed H[Ru(III)Cl2(H2EDTA)] was obtained

Summary

Introduction

The development of chemically modified electrodes (CME) and their application in electroanalytical techniques have been extensively revised [1, 2]. There is a great interest in the modification of silicas by organic compounds that can act as ligands for the coordination of metallic ions in theirsurface and used in the construction of chemically modified electrodes of carbon paste electrodes (CPE), in the study of the electrochemical behavior of these anchored complexes, in electroanalysis and electrocatalysis [1,2,3,4,5,6,7]. The advantages of the use of organofunctionalized silica, containing on its surface the sequestering agent for transition metals are related to their high thermal stability, the accessibility of reactive centers and its insolubility in organic means [8, 9]. The present investigation, new ruthenium complexes were supported on the surface of chemically modified silicas and the carbon paste electrode (EPC) was constructed by incorporating one of these silicas into the graphite. The anchorage of the ruthenium complex was through the reaction of RuCl3 x H2O, in ethanolic means with the SF3APTS/EDTA silica and by the reaction of this silica with the H[Ru(III)Cl2(H2EDTA)] complex, previously synthesized [10]

Methods

Results

Conclusion