Keychain detector could catch food allergens before it's too late

(American Chemical Society) For kids and adults with food allergies, a restaurant outing can be a fraught experience. Even when care is taken, freshly prepared or packaged meals can accidentally become cross-contaminated with an offending food and trigger a reaction. Now researchers report in the journal ACS Nano the development of a new portable allergen-detection system -- including a keychain analyzer -- that could help prevent trips to the emergency room.