Scientist developed new biochip to detect blood sugar via saliva

Jun 6, 2014 11:25 IST

Brown UniversityUS scientists at Brown University have developed a new biochip sensor to detect blood sugar via saliva.

The advance is an important step towards a device that would enable people with diabetes to test their glucose levels without drawing blood.

The biochip is made from a one-inch-square piece of quartz coated with a thin layer of silver. Etched in the silver are thousands of nanoscale interferometers tiny slits with a groove on each side.

The new chip makes use of a series of specific chemical reactions combined with plasmonic interferometry, a means of detecting chemical signature of compounds using light.

The device is sensitive enough to detect differences in glucose concentrations that amount to just a few thousand molecules in the sampled volume. The grooves measure 200 nanometers wide, and the slit is 100 nanometers wide about 1000 times thinner than a human hair.

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