Featured Research

from universities, journals, and other organizations

Carbon Nanotubes Yield A New Class Of Biological Sensors

Date:
December 15, 2004
Source:
National Science Foundation
Summary:
Nanotechnology researchers at the University of Illinois in Urbana-Champaign have demonstrated a tiny, implantable detector that could one day allow diabetics to monitor their glucose levels continuously—without ever having to draw a blood sample.

This glass capillary tube, shown here on a fingertip, has been loaded with glucose-sensitive nanotubes. The capillary tube keeps the nanotubes confined, but has porous walls so that glucose molecules can get to them.
Credit: Michael S. Strano

Arlington, Va. -- Nanotechnology researchers at the University of Illinois in Urbana-Champaign have demonstrated a tiny, implantable detector that could one day allow diabetics to monitor their glucose levels continuously—without ever having to draw a blood sample.

The work, which is the first application of a whole new class of biological sensors, was funded by the National Science Foundation (NSF) and announced December 12 in the online edition of the journal Nature Materials.

Principal investigator Michael Strano, a professor of chemical and biomolecular engineering at Illinois, explains that the new sensors are based on single-walled carbon nanotubes: cylindrical molecules whose sides are formed from a lattice of carbon atoms. The idea is to exploit the nanotubes’ ability to fluoresce, or glow, when illuminated by certain wavelengths of infrared light—“a region of the spectrum where human tissue and biological fluids are particularly transparent,” says Strano.

To make a sensor, Strano and his collaborators first coat the nanotubes with a “molecular sheath”: a one-molecule-thick layer of compounds that react strongly with a particular chemical—in this case, glucose. The mix of compounds is chosen so that the reaction also changes the nanotubes’ fluorescent response. Then the researchers load the coated nanotubes into a needle-thin capillary tube that can safely be implanted into the body. The capillary keeps the nanotubes from directly touching living cells but still allows glucose to enter.

The Illinois researchers tested their glucose sensor by inserting it into a human tissue sample. Then they illuminated the sample with an infrared laser and verified that the strength of the fluorescence from the buried sensor was directly related to the glucose concentrations in the tissue.


Story Source:

The above story is based on materials provided by National Science Foundation. Note: Materials may be edited for content and length.


Cite This Page:

National Science Foundation. "Carbon Nanotubes Yield A New Class Of Biological Sensors." ScienceDaily. ScienceDaily, 15 December 2004. <www.sciencedaily.com/releases/2004/12/041214081957.htm>.
National Science Foundation. (2004, December 15). Carbon Nanotubes Yield A New Class Of Biological Sensors. ScienceDaily. Retrieved August 20, 2014 from www.sciencedaily.com/releases/2004/12/041214081957.htm
National Science Foundation. "Carbon Nanotubes Yield A New Class Of Biological Sensors." ScienceDaily. www.sciencedaily.com/releases/2004/12/041214081957.htm (accessed August 20, 2014).

Share This




More Matter & Energy News

Wednesday, August 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Newsy (Aug. 19, 2014) Scientists have developed a new device that mimics the way octopuses blend in with their surroundings to hide from dangerous predators. Video provided by Newsy
Powered by NewsLook.com
Researcher Testing on-Field Concussion Scanners

Researcher Testing on-Field Concussion Scanners

AP (Aug. 19, 2014) Four Texas high school football programs are trying out an experimental system designed to diagnose concussions on the field. The technology is in response to growing concern over head trauma in America's most watched sport. (Aug. 19) Video provided by AP
Powered by NewsLook.com
Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

AFP (Aug. 19, 2014) A solar cell that resembles a flower is offering a new take on green energy in Japan, where one scientist is searching for renewables that look good. Duration: 01:29 Video provided by AFP
Powered by NewsLook.com
Tiny Satellites, Like The One Tossed From ISS, On The Rise

Tiny Satellites, Like The One Tossed From ISS, On The Rise

Newsy (Aug. 18, 2014) The Chasqui I, hand-delivered into orbit by a Russian cosmonaut, is one of hundreds of small satellites set to go up in the next few years. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins