期刊
TALANTA
卷 196, 期 -, 页码 362-369出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2018.12.069
关键词
Phenolic monoterpenes; Thymol; Carvacrol; Linear sweep voltammetry; Glassy carbon electrodes; Essential oils
资金
- Agenda Nacional de Promocion Cientifica y Tecnologica FONCYT [PICT 2266/2014, PICT 2112/2015]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas CONICET [PIP 112-201101-00184]
- Ministerio de Ciencia y Tecnologia de la Provincia de Cordoba (MINCyT) [PID 050/2010]
- Secretaria de Ciencia yTecnica (SECyT) from Universidad Nacional de Rio Cuarto [331/16]
- CONICET
A simple, rapid and non-expensive method is proposed to determine phenolic monoterpenes such as thymol and carvacrol in essential oils of thyme and oregano. The linear sweep voltammetry based on glassy carbon electrodes was the electrochemical technique used. Thymol and carvacrol have one main oxidation peak in non aqueous media centered at about 1.3 V vs. Ag/AgCI. The electron transfer process is mainly diffusion controlled. The calibration plots generated using the commercial standards of thymol and carvacrol were used to estimate the total content in real samples. The calibration plots were linear in the concentration range from 8.5 x 10(-5) to 1.3 x 10(-3) mol L-1 and 7.9 x 10(-5) to 1.2 x 10(-3) mol L-1 for thymol and carvacrol, respectively. Results obtained with the electrochemical method are in good agreement with those of the official method (gas chromatography). In addition, the analytical procedure does not require previous preparation of the sample or modification of the electrode surface. The electrochemical technique used is very simple to apply. Under these conditions, the methodology proposed is a good, simple and fast option to perform a quality control of essential oils.
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