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

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.