Journal
ELECTROANALYSIS
Volume 23, Issue 9, Pages 2212-2216Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201100245
Keywords
Screen-printed electrodes; Carbon nanotubes; Electrochemical detection; Mexican oregano oils
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Funding
- Spanish Ministry of Science and Innovation [CTQ2008-06730-CO2-02/BQU]
- AVAN-SENS program [P2009/PPQ-1642]
- Mexican Council for Science and Technology [50596-Q]
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An electrochemical screening for the determination of total biomarkers (thymol and carvacrol) of Lippia graveolens using single-walled carbon nanotubes screen-printed electrodes (SWCNT-SPEs) is proposed. The suitability of the approach was demonstrated using GC-MS by the analysis of selected Mexican oregano essential oil chemotypes. The analytical performance was excellent in terms of inter-droplet precision (RSD <= 6%), sensitivity and linearity. An electrochemical index of biomarkers is proposed for fast assessment of oregano quality using just 50 mu L of the sample. The route here proposed constitutes a very convenient screening tool in decentralized analysis because of the simplicity, disposability and easy-to-use by non-specialist user.
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