Czech J. Food Sci., 2016, 34(6):495-502 | DOI: 10.17221/107/2016-CJFS

Identification of Smallanthus sonchifolius in herbal tea mixtures by PCR and DART/TOF-MS methodsFood Microbiology and Safety

Jana ŽIAROVSKÁ1, Aleš RAJCHL2, Eloy FERNÁNDEZ3, Jana PRCHALOVÁ2, Luigi MILELLA4
1 Department of Genetics and Plant Breeding, Faculty of Agrobiology and Food Resources, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
2 Department of Food Preservation, University of Chemistry and Technology in Prague, Prague, Czech Republic
3 Faculty of Tropical AgriSciences, Czech University of Life Sciences in Prague, Czech Republic
4 Department of Science, University of Basilicata, Potenza, Italy

The identification of yacon, a medicinal plant, in tea mixtures by rapid Polymerase Chain Reaction (PCR) and the Direct Analysis in Real Time coupled with Time-of-Flight Mass Spectrometry (DART/TOF-MS) method were evaluated. Three tea products and a pure yacon tea were analysed using the molecular method PCR, concretely the intraspecific variation of the internal transcribed spacer (ITS) regions of rDNA and the DART method coupled with TOF-MS. The results show the reliability of PCR and restriction cleavage of the ITS as a combined approach to confirm the presence of yacon in herbal tea mixtures. Three fragments of approximately 700, 408, and 235 bp in length are present when yacon is a part of the herbal tea mixture. The Principal Component Analysis (PCA) based on the fingerprints of the complete Total Ion Current (TIC) mass spectra shows sufficient separation of herbal teas with and without yacon leaves. The reported methods are technically rapid and can be used as an effective tool for the purposes of yacon identification or authentication.

Keywords: authentication; DraIII; ITS; yacon

Published: December 31, 2016  Show citation

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ŽIAROVSKÁ J, RAJCHL A, FERNÁNDEZ E, PRCHALOVÁ J, MILELLA L. Identification of Smallanthus sonchifolius in herbal tea mixtures by PCR and DART/TOF-MS methods. Czech J. Food Sci. 2016;34(6):495-502. doi: 10.17221/107/2016-CJFS.
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