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Stanford researchers invent nanotech microchip to diagnose type-1 diabetes
Date:7/13/2014

the childhood obesity epidemic, about a quarter of newly diagnosed children have type-2 diabetes. And, for unclear reasons, a growing number of newly diagnosed adults have type-1.

Type-1 diabetes is an autoimmune disease caused by an inappropriate immune-system attack on healthy tissue. As a result, patients' bodies stop making insulin, a hormone that plays a key role in processing sugar. The disease begins when a person's own antibodies attack the insulin-producing cells in the pancreas. The auto-antibodies are present in people with type-1 but not those with type-2, which is how tests distinguish between them.

A growing body of evidence suggests that rapid detection of, and aggressive new therapies for, type-1 diabetes benefit patients in the long run, possibly halting the autoimmune attack on the pancreas and preserving some of the body's ability to make insulin.

The old, slow test detected the auto-antibodies using radioactive materials, took several days, could only be performed by highly-trained lab staff and cost several hundred dollars per patient. In contrast, the microchip uses no radioactivity, produces results in minutes, and requires minimal training to use. Each chip, expected to cost about $20 to produce, can be used for upward of 15 tests. The microchip also uses a much smaller volume of blood than the older test; instead of requiring a lab-based blood draw, it can be done with blood from a finger prick.

The microchip relies on a fluorescence-based method for detecting the antibodies. The team's innovation is that the glass plates forming the base of each microchip are coated with an array of nanoparticle-sized islands of gold, which intensify the fluorescent signal, enabling reliable antibody detection. The test was validated with blood samples from people newly diagnosed with diabetes and from people without diabetes. Both groups had the old test and the microchip-based test performed on their blood.

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Contact: Erin Digitale
digitale@stanford.edu
650-724-9175
Stanford University Medical Center
Source:Eurekalert

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