Corporate Banner
Satellite Banner
Molecular & Clinical Diagnostics
Scientific Community
 
Become a Member | Sign in
Home>News>This Article
  News
Return

Sensor Detects Glucose in Saliva and Tears for Diabetes Testing

Published: Thursday, September 13, 2012
Last Updated: Thursday, September 13, 2012
Bookmark and Share
Researchers have created a new type of biosensor that can detect minute concentrations of glucose in saliva, tears and urine and might be manufactured at low cost because it does not require many processing steps to produce.

"It's an inherently non-invasive way to estimate glucose content in the body," said Jonathan Claussen, a former Purdue University doctoral student and now a research scientist at the U.S. Naval Research Laboratory. "Because it can detect glucose in the saliva and tears, it's a platform that might eventually help to eliminate or reduce the frequency of using pinpricks for diabetes testing. We are proving its functionality."

Claussen and Purdue doctoral student Anurag Kumar led the project, working with Timothy Fisher, a Purdue professor of mechanical engineering; D. Marshall Porterfield, a professor of agricultural and biological engineering; and other researchers at the university's Birck Nanotechnology Center.

Findings are detailed in a research paper being published this week in the journal Advanced Functional Materials.

"Most sensors typically measure glucose in blood," Claussen said. "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."

The paper, featured on the journal's cover, was written by Claussen, Kumar, Fisher, Porterfield and Purdue researchers David B. Jaroch, M. Haseeb Khawaja and Allison B. Hibbard.

The sensor has three main parts: layers of nanosheets resembling tiny rose petals made of a material called graphene, which is a single-atom-thick film of carbon; platinum nanoparticles; and the enzyme glucose oxidase.

Each petal contains a few layers of stacked graphene. The edges of the petals have dangling, incomplete chemical bonds, defects where platinum nanoparticles can attach. Electrodes are formed by combining the nanosheet petals and platinum nanoparticles. Then the glucose oxidase attaches to the platinum nanoparticles. The enzyme converts glucose to peroxide, which generates a signal on the electrode.

"Typically, when you want to make a nanostructured biosensor you have to use a lot of processing steps before you reach the final biosensor product," Kumar said. "That involves lithography, chemical processing, etching and other steps. The good thing about these petals is that they can be grown on just about any surface, and we don't need to use any of these steps, so it could be ideal for commercialization."

In addition to diabetes testing, the technology might be used for sensing a variety of chemical compounds to test for other medical conditions.

"Because we used the enzyme glucose oxidase in this work, it's geared for diabetes," Claussen said. "But we could just swap out that enzyme with, for example, glutemate oxidase, to measure the neurotransmitter glutamate to test for Parkinson's and Alzheimer's, or ethanol oxidase to monitor alcohol levels for a breathalyzer. It's very versatile, fast and portable."

The technology is able to detect glucose in concentrations as low as 0.3 micromolar, far more sensitive than other electrochemical biosensors based on graphene or graphite, carbon nanotubes and metallic nanoparticles, Claussen said.

"These are the first findings to report such a low sensing limit and, at the same time, such a wide sensing range," he said.

The sensor is able to distinguish between glucose and signals from other compounds that often cause interference in sensors: uric acid, ascorbic acid and acetaminophen, which are commonly found in the blood. Unlike glucose, those compounds are said to be electroactive, which means they generate an electrical signal without the presence of an enzyme.

Glucose by itself doesn't generate a signal but must first react with the enzyme glucose oxidase. Glucose oxidase is used in commercial diabetes test strips for conventional diabetes meters that measure glucose with a finger pinprick.


Further Information
Access to this exclusive content is for Technology Networks Premium members only.

Join Technology Networks Premium for free access to:

  • Exclusive articles
  • Presentations from international conferences
  • Over 2,400+ scientific posters on ePosters
  • More than 3,700+ scientific videos on LabTube
  • 35 community eNewsletters


Sign In



Forgotten your details? Click Here
If you are not a member you can join here

*Please note: By logging into TechnologyNetworks.com you agree to accept the use of cookies. To find out more about the cookies we use and how to delete them, see our privacy policy.

Related Content

Microsecond Raman Imaging Might Probe Cells, Organs for Disease
An advanced medical diagnostic tool for the early detection of cancer and other diseases.
Thursday, April 02, 2015
Keck Foundation to Fund Purdue Research into Spectroscopic Imaging
Ji-Xin Cheng leads a Purdue team awarded a $1 million W.M. Keck Foundation grant to develop a new type of imaging technology for cell and tissue analysis that could bring advanced medical diagnostics.
Tuesday, February 10, 2015
Cell-Detection System Promising for Medical Research, Diagnostics
Researchers are developing a system that uses tiny magnetic beads to quickly detect rare types of cancer cells circulating in a patient's blood.
Thursday, October 03, 2013
Purdue to Accelerate Drug Discovery, Development
Purdue Center for Drug Discovery adds to Purdue's strengths and the capacity to translate basic research into life-changing treatments.
Monday, September 16, 2013
Indiana Biosciences Research Institute Unveiled
Purdue University part of first industry-led collaborative life sciences research institute in the United States.
Monday, June 10, 2013
New Imaging Technology Could Reveal Cellular Secrets
Researchers have married two biological imaging technologies, creating a new way to learn how good cells go bad.
Friday, April 26, 2013
MolecularHUB Gives Scientific Information on Fast-moving Diseases
A scientific gateway website that will provide molecular and genetic information on infectious and emerging diseases has been released by Purdue University.
Thursday, October 25, 2012
Scientific News
Long Telomeres Associated with Increased Lung Cancer Risk
Genetic predisposition for long telomeres predicts increased lung adenocarcinoma risk.
Paving the way to Better Ovarian Cancer Diagnosis
Aïcha BenTaieb will present her invention for automated identification of ovarian cancer’s many subtypes at an international conference this fall.
The Genetic Roots of Adolescent Scoliosis
Scientists at the RIKEN Center for Integrative Medical Sciences in collaboration with Keio University in Japan have discovered a gene that is linked to susceptibility of Scoliosis.
Diagnostic Test Developed for Enterovirus D68
researchers at Washington University School of Medicine in St. Louis have developed a diagnostic test to quickly detect enterovirus D68 (EV-D68), a respiratory virus that caused unusually severe illness in children last year.
Tracking Breast Cancer Before it Grows
A team of scientists led by University of Saskatchewan researcher Saroj Kumar is using cutting-edge Canadian Light Source techniques to screen and treat breast cancer at its earliest changes.
The Light of Fireflies for Medical Diagnostics
EPFL scientists have exploited the light of fireflies in a new method that detects biological molecules without the need for complex devices and high costs.
Could a simple saliva test detect Alzheimer's?
Researchers have presented findings suggesting that a simple, non-invasive diagnostic for Alzheimer's could be within reach.
Cheap Diagnostics with a Portable "Paper Machine"
Scientists have developed a cheap, portable system for point of care diagnostics for a range of infectious diseases, genetic conditions and cancer.
New Variant of Streptococcal Bacteria
Scientists have discovered a new variant of streptococcal bacteria that has contributed to a rise in disease cases in the UK over the last 17 years.
New Insights into “Antenna” of Human Cells
Scientists from the University of Leeds have uncovered the most comprehensive list yet of genes implicated in a group of common inherited diseases.
Skyscraper Banner

Skyscraper Banner
Go to LabTube
Go to eposters
 
Access to the latest scientific news
Exclusive articles
Upload and share your posters on ePosters
Latest presentations and webinars
View a library of 1,800+ scientific and medical posters
2,400+ scientific and medical posters
A library of 2,500+ scientific videos on LabTube
3,700+ scientific videos
Close
Premium CrownJOIN TECHNOLOGY NETWORKS PREMIUM FREE!