oregano adulteration (2)

FSAI has worked with a commercial laboratory (Identigen) over the past two years to adapt NGS (next generation sequencing), so that it can be used as a DNA screening tool to check that the composition of the food matches what is stated on the product’s labelling or descripion. FSAI screened 45 plant-based foods and food supplements from Irish health food shops and supermarkets. It looked for the presence of all plant species in the selected products and identified 14 food products for further investigation that may contain undeclared plant species. Of these 14 products, one was confirmed to contain undeclared mustard at significant levels, which is an allergen that should be declared. Another product (oregano) was found to contain DNA from two undeclared plant species, one at significant levels. A third product was found to have no DNA from the plant species declared on the label, but instead rice DNA was identified. All three products are under further investigation. FSAI will apply the same technology for the screening of meat, poultry and fish products.

 Read the FSAI Press Release and the full report

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 In this study, more than 400 pesticides were screened in a representative set of 42 genuine and 34 adulterated dried oregano samples collected from various locations across Europe. The results obtained by advanced mass spectrometry-based methods, showed, that some pesticide residues could be detected in virtually all tested samples, nevertheless, on average, higher contamination was found in the adulterated oregano samples. Increased incidence of insecticides such as cyfluthrin, permethrin and cyhalothrin was typical for these samples, moreover, pyriproxyfen was detected exclusively in adulterated samples. As pyriproxyfen was absent in genuine oregano, it could be used as a screen for adulterated oregano. 

    Read the abstract here

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