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Electrochemical Behavior of Chlorogenic Acid at a Boron‐Doped Diamond Electrode and Estimation of the Antioxidant Capacity in the Coffee Samples Based on Its Oxidation Peak
Author(s) -
Yardım Yavuz
Publication year - 2012
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1750-3841.2011.02609.x
Subject(s) - chlorogenic acid , electrode , chemistry , electrochemistry , diamond , detection limit , electroanalytical method , calibration curve , stripping (fiber) , voltammetry , antioxidant , analytical chemistry (journal) , boron , chromatography , materials science , nuclear chemistry , potentiometric titration , biochemistry , organic chemistry , composite material
Abstract: In this study, an electroanalytical methodology for the determination of chlorogenic acid (CGA) was achieved at a boron‐doped diamond electrode under adsorptive transfer stripping voltammetric conditions. The values obtained for CGA were used to estimate the antioxidant properties of the coffee sample based on CGA oxidation. By using square‐wave stripping mode, the compound yielded a well‐defined voltammetric response at +0.49 V with respect to Ag/AgCl in Britton–Robinson buffer at pH 3.0 (after 120 s accumulations at a fixed potential of 0.40 V). At the optimum experimental conditions, linear calibration curve is obtained within the concentration range of 0.25 to 4.0 μg mL −1 with the limit of detection 0.049 μg mL −1 . The developed protocol was successfully applied for the analysis of antioxidant capacity in the coffee products such as Turkish coffee and instant coffee.