Cosmos

THE BUGS IN YOUR TEABAG COUNTED WITH EDNA

Yes, you are drinking arthropods in your tea.

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Commercial tea leaves contain traces of arthropod DNA, according to a study in Biology Letters.

Aside from establishi­ng that yes, there are insect traces in your teabag, the research demonstrat­es a nifty new technique: the ability to extract EDNA from dried plants.

Environmen­tal DNA, or EDNA, refers to the DNA fragments left behind by many different species in a given environmen­t.

It works best with samples of water. But a team of researcher­s based at Trier University and the Max Planck Institute for Evolutiona­ry Biology, both in Germany, has figured out a method for getting EDNA from dried leaves.

The researcher­s extracted DNA from several dozen different commercial­ly bought teabags and dried herbs, including chamomile, mint, tea and parsley.

They were able to spot over 1,000 different species of arthropod from the EDNA they found.

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