In Development: A rub on tattoo for blood sugar control

The thin, flexible device created by nanoengineers at UCSD is based on the much bulkier GlucoWatch, a now-discontinued wristband that worked through the same glucose-sucking principal. But the electric current GlucoWatch used to attract glucose to the surface of the skin was too high, and wearers were not keen on the discomfort. This temporary tattoo gets around the problem by using a gentler but still effective current. It then detects glucose through an enzyme that breaks glucose down into oxygen and hydrogen peroxide. The amount of hydrogen peroxide is a proxy for blood glocal levels.