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

Jana Žiarovská, Aleš Rajchl, Eloy Fernández, Jana Prchalová and Luigi Milella
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Jana Žiarovská: Department of Genetics and Plant Breeding, Faculty of Agrobiology and Food Resources, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Aleš Rajchl: Department of Food Preservation, University of Chemistry and Technology in Prague, Prague, Czech Republic
Eloy Fernández: Faculty of Tropical AgriSciences, Czech University of Life Sciences in Prague, Czech Republic
Jana Prchalová: Department of Food Preservation, University of Chemistry and Technology in Prague, Prague, Czech Republic
Luigi Milella: Department of Science, University of Basilicata, Potenza, Italy

Czech Journal of Food Sciences, 2016, vol. 34, issue 6, 495-502

Abstract: 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 (search for similar items in EconPapers)
Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:34:y:2016:i:6:id:107-2016-cjfs

DOI: 10.17221/107/2016-CJFS

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Czech Journal of Food Sciences is currently edited by Ing. Zdeňka Náglová, Ph.D.

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