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Electrochemically Activated Pencil Lead Electrode as a Sensitive Voltammetric Sensor to Determine Gallic Acid by Esmaeel Alipour; Fatemeh Mirzae Bolali; Sheida Norouzi; Afsaneh Saadatirad is a Agricultural and Biological Sciences article available to read on EtoBox.

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An electrochemical sensor for the determination of some polyphenolic compounds such as Gallic acid (GA) and Galloyl esters was developed using the activated pencil lead electrode (APLE). At first, a study has been made of the optimum conditions for electrochemical activation of the pencil lead electrode. Potentiodynamic and potentiostatic strategies were investigated for activation of the pencil lead electrode and the results show that the potentiodynamic pretreatment gives better performance toward measurement of the polyphenolic compounds. Electrochemical properties of GA were investigated using chronoamperometry and cyclic voltammetry; and some thermodynamic and kinetic variables such as α, n α , and D were calculated. Sensitive differential pulse voltammetry (DPV) technique was applied for the determination of Gallic acid and Galloyl esters in different samples. Enhanced oxidation peak currents of Gallic acid were observed at APLE when compared with nonactivated PLE. The calibration graph has two linear ranges of 0.49-24.3 μM and 0.07-0.83 mM, and the obtained limit of detection for S/N = 3 was 0.25 μM. Adsorptive stripping differential pulse voltammetry (AdSDPV) was also condu

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Author

Esmaeel Alipour; Fatemeh Mirzae Bolali; Sheida Norouzi; Afsaneh Saadatirad

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)