A graphene patch that monitors and possibly treats diabetes | Ars Technica: "The device is activated when a sufficient amount of sweat is detected. Although diabetes is associated with blood glucose levels, studies have actually shown that these levels can be estimated from precise measurements of sweat glucose concentrations. The readings from the device exhibited a lag time that is consistent with results from previous investigations of sweat glucose (meaning that there's a consistent delay between changes in blood levels and when those changes show up in the sweat). The device contains the enzyme glucose oxidase, which is able to oxidize glucose and form hydrogen peroxide in the process. The hydrogen peroxide is then involved in another chemical reaction that results in noticeable electrochemical changes, which the glucose and pH sensors measure. The patch can be connected to a portable electrochemical analyzer that has a dual function: power source and wireless data transmitter. The device is rather user-friendly; the data can be easily sent to a smartphone or tablet."
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