This £30 keychain that detects food allergens could save your life
The device detected gluten in salad and an egg protein in beer.

Eating out can often be a difficult experience for people with food allergies but researchers now have produced something that could help with that.
Scientists have developed what they call a new “portable allergen-detection system” that looks like a keychain and they say it could help prevent trips to A&E.
Reaction to food allergies can range from a mild rash to life-threatening anaphylaxis.

Researchers Ralph Weissleder, Hakho Lee and their colleagues wanted to develop something that was more consumer-friendly, so they created the $40 (£30) portable device which they called the integrated exogenous antigen testing (iEAT).
The device comes in two parts – an electronic keychain reader for sensing allergens that wirelessly communicates the results to a smartphone and a handheld gadget to extract allergens.

Conventional methods require extensive lab tests which can be slow.

The prototype has been designed to detect five allergens but the researchers say the device could be expanded to test for additional compounds, including other allergens and non-food contaminants such as pesticides.
The research is published in the journal ACS Nano.