Journal
ELECTROANALYSIS
Volume 27, Issue 7, Pages 1660-1668Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201400712
Keywords
Voltammetry; Electropolymerization; Polyeugenol; Nanotubes; Antioxidants; Food analysis
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Eugenol electropolymerization conditions on multiwalled carbon nanotube based glassy carbon electrode (MWNT/GCE) have been found. The polyeugenol/MWNT/GCE shows reversible redox steps of o-quinone fragment in acidic media. Natural phenolic antioxidants are oxidized on polyeugenol/MWNT/GCE at 0.52V excluding resveratrol (0.62V). Differential pulse voltammetry on polyeugenol/MWNT/GCE was applied for the evaluation of wine antioxidant capacity (AOC). The AOC was expressed in catechin equivalents per 1L of wine. The linear dynamic range is 1.00-250 mu M with LOD and LOQ of 0.21 and 0.71 mu M of catechin, respectively. Positive correlations for AOC with antioxidant activity (r=0.9840) and total phenolics content (r=0.9944) were observed.
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