The painful finger pricks may become a thing of the past for those managing their diabetes, as tears and saliva may become an effective substitute liquid for testing
San Francisco, CA -- (SBWIRE) -- 10/26/2012 -- Anurag Kuman, a current Purdue University PhD candidate and IIT-Delhi graduate, may have engineered a new type of sensor that can detect small glucose concentrations in other bodily secretions.
The finding could mean more comfortable and cheap ways to test blood sugar levels, as the process requires fewer steps than current tests.
"It's an inherently non-invasive way to estimate glucose content in the body. Because it can detect glucose in the saliva and tears, it is a platform that might eventually help to eliminate or reduce the frequency of using pinpricks for diabetes testing. We are proving its functionality," said the Purdue and US Naval Research Laboratory.
The team looks to publish their findings in Advanced Functional Materials journal.
The new test will be capable of detecting glucose in as small of concentrations as 0.3 micromolar. This is far more sensitive than current tests.
"Most sensors typically measure glucose in blood. Many in the literature aren't able to detect glucose in tears and the saliva. What's unique is that we can sense in all four different human serums: the saliva, blood, tears and urine. And that hasn't been shown before," Said Kumar.
"It is a graphene based sensor that has very low detection limit for glucose and a very wide sensing range. A human tear could contain 0.2 to 0.4 milimose glucose. Our sensor can detect 0.01 to 50 milimose of glucose. Soon, we can tell whether a patient is diabetic or not just by testing his urine, saliva or tear instead of a finger prick for blood."
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