Journal
ELECTROCATALYSIS
Volume 14, Issue 1, Pages 18-28Publisher
SPRINGER
DOI: 10.1007/s12678-022-00770-2
Keywords
Alumina; X-ray diffraction; Infrared spectroscopy; Sensors; Wine
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A novel and simple electrochemical sensor for the determination of gallic acid was developed using alumina-modified carbon paste electrode. The performance of the sensor was evaluated by cyclic voltammetry and square-wave voltammetry techniques, demonstrating an irreversible diffusion-controlled oxidation of gallic acid. The sensor exhibited a linear relationship between peak current and concentration in the range of 1.4 to 115 μM, with a detection limit of 0.8 μM. The ability of the sensor to detect gallic acid in wine samples was successfully validated.
A novel and simple electrochemical sensor for the determination of gallic acid is presented. The alumina sample was characterized by X-ray diffraction, FTIR, and particle size distribution analysis. The carbon paste electrode was modified with alumina and used as a sensor. The performances of the sensor were assessed by cyclic voltammetry and square-wave voltammetry techniques. The oxidation of gallic acid on alumina-modified carbon paste electrode was an irreversible diffusion-controlled process. The linear relationship of peak current and concentration was obtained for the concentration range of 1.4 to 115 mu M with the limit of detection of 0.8 mu M. The sensor's ability to test gallic aid in real systems was successfully tested in wine samples.
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