Journal
ELECTROANALYSIS
Volume 31, Issue 2, Pages 222-230Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201800455
Keywords
Voltammetry; Capsaicinoids; Electropolymerization; Modified electrodes; Plant analysis
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Funding
- Russian Foundation for Basic Research [16-03-00507-a]
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Novel voltammetric approach for the selective determination of total capsaicinoids has been developed using glassy carbon electrode modified with multi-walled carbon nanotubes and poly(gallic acid) (PGA/MWNT/GCE). The modified electrode provides significant improvements in the capsaicinoids voltammetric characteristics in comparison to GCE and MWNT/GCE. The electrooxidation of capsaicinoids is irreversible adsorption-controlled process with the anodic transfer coefficient of 0.49-0.53 and heterogeneous electron transfer rate constant of 1300-2400s(-1). The analytical ranges of 0.010-1.0 and 1.0-50M for capsaicin, 0.025-0.75 and 0.75-75M for dihydrocapsaicin and 0.025-5.0 and 5.0-75M for nonivamide with the detection limits of 2.9, 5.9 and 6.1nM, respectively, have been obtained using differential pulse voltammetry (DPV). The selectivity of the capsaicinoids quantification in the presence of ascorbic acid, -tocopherol and carotenoids is shown. The method has been tested on the samples of red hot pepper spices and Capsicum annuum L. tinctures. The results correspond to the chromatographic data.
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