New biosensor produces sweat even when patient is relaxed
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US researchers have developed a biosensor that uses a chemical stimulant to produce sweat even when the patient is relaxed and cool. The study, which has been published in the journal Lab on a Chip, has found that testing sweat, an important factor in understanding the hormones or chemicals, has several possible benefits over blood. Blood analysis is considered the gold standard for biometric analysis. But biometric testing with blood is invasive and often requires the use of a lab. Sweat provides a noninvasive alternative, with chemical markers that are more useful in monitoring health than saliva or tears.

For the study, the researchers applied sensors and a gel containing carbachol, a chemical used in eyedrops, to their subject's forearm for 2.5 minutes. They then recorded data obtained from the subject's sweat for 30 minutes using sensors that measured concentrations of sweat electrolytes. Carbachol was effective at inducing sweating under the sensor for as long as five hours.



http://pubs.rsc.org/en/content/articlelanding/2016/lc/c6lc01013j#!divAbstract
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