Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Simultaneous analysis

Abstract:
Simultaneous carbon dioxide and oxygen sensing

Simultaneous analysis

Posted on June 22, 2006

Breathing. Birds, do it, bees do it, even educated trees do it. But, only plants can make sugars from the carbon dioxide byproduct and at the same time expel oxygen during photosynthesis. This amazing skill has intrigued scientists for decades but separating out the carbon dioxide inputs and outputs while keeping tabs on oxygen levels has always proved difficult.

Now, a new type of chemical sensor, described in the journal Advanced Materials, could change all that. The sensor developed by Otto Wolfbeis and colleagues at the Institute of Analytical Chemistry, Chemo- and Biosensors at the University of Regensburg, Germany, will allow clearer insights into plant respiration and photosynthesis. It could also have application in the food and drink industry as well as in the biotech industry where fermentation and related plant processes are important.

Woflbeis explains that in order to unravel the intricacies of photosynthesis and respiration, two of the most important biochemical processes, scientists have to be able to measure carbon dioxide and oxygen at the same time. He and his team have now found a way to side-step the interference from which all previous sensors suffer. The team first create nanoparticles carrying a fluorescent group that react to light and glow only when they are in contact with carbon dioxide molecules.

These nanoparticles are then embedded in a layer of polymer resin. A second compound that does the same in the presence of oxygen molecules is embedded in a second layer of polymer and the two films sandwich between them a layer of an organometallic compound containing the heavy metal iridium. This layer produces a reference signal for the detection of fluorescence triggered by the two gases. Importantly, however, it is impermeable to oxygen molecules and so its light is not quenched by interference from oxygen.

A blue light-emitting diode (LED) then provides the stimulation for the two sensitive layers to produce light, but only in the presence of their respective gases. A tiny photodetector can then measure the wavelength of light emitted, which is different from each sensor molecule. The strength of the emitted light at each wavelength correlates with the concentration of each of the two gases.

The team tested their sensor over a wide range of different carbon dioxide and oxygen concentrations produced by a growing microbial culture and found it to operate with a remarkable ±5% accuracy at concentration levels expected for real experiments. At much higher but unrealistic concentrations, accuracy deviated only by as much ±10%. Because the device is designed to be reusable rather than a one-shot dip test, the team tested its response after several hundred runs and found it to still be working at these levels of accuracy after 800 runs.

They anticipate that their composite material will become a powerful tool in biological, biotechnological, and medical research. The simultaneous sensor could also have applications in environmental monitoring of sea water and sewage and in medical diagnostics, where blood gas levels are important to understanding the progression of certain diseases.

The research will be commercialized by Presens GmbH (see http://www.presens.de).

“It is likely to become a powerful tool in combinatorial microbiology, in cell-based screening for drugs, and in biomonitoring in general," Wolfbeis explains. "In combination with fiber optic microsensors, in vivo sensing of oxygen and carbon dioxide should be possible.”

####


Author: Otto Wolfbeis, University of Regensburg (Germany), www.wolfbeis.de/

Title: Composite Material for Simultaneous and Contactless Luminescent Sensing and Imaging of Oxygen and Carbon Dioxide

Angewandte Chemie International Edition, 2006, 18, No. 12, 1511–1516, doi: 10.1002/adma.200600120

Contact:
Editorial office:
angewandte@wiley-vch.de

or David Greenberg (US)
dgreenbe@wiley.com

or Julia Lampam (UK)
jlampam@wiley.co.uk

Copyright © Angewandte Chemie

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Possible Futures

GS7 Graphene Sensor maybe Solution in Fight Against Cancer January 25th, 2015

Nanotechnology in Energy Applications Market Research Report 2014-2018: Radiant Insights, Inc January 15th, 2015

'Mind the gap' between atomically thin materials December 23rd, 2014

A novel method for identifying the body’s ‘noisiest’ networks November 19th, 2014

Sensors

Detection of Heavy Metals in Samples with Naked Eye January 26th, 2015

GS7 Graphene Sensor maybe Solution in Fight Against Cancer January 25th, 2015

Nanosensor Used for Simultaneous Determination of Effective Tea Components January 24th, 2015

Iranian Scientists Produce Graphene-Based Oxygen Sensor January 23rd, 2015

Materials/Metamaterials

Evidence mounts for quantum criticality theory: Findings bolster theory that quantum fluctuations drive strange electronic phenomena January 30th, 2015

Crystal light: New light-converting materials point to cheaper, more efficient solar power: University of Toronto engineers study first single crystal perovskites for new solar cell and LED applications January 30th, 2015

The Original Frameless Shower Doors Installs DFI's FuseCube™ to Offer Hydrophobic Protective Coating as a Standard Feature: First DFI FuseCube™ Installed on the East Coast to Enable Key Differentiator for the Original Frameless Shower Doors January 29th, 2015

Creating new materials with quantum effects for electronics January 29th, 2015

Announcements

New method allows for greater variation in band gap tunability: The method can change a material's electronic band gap by up to 200 percent January 31st, 2015

Evidence mounts for quantum criticality theory: Findings bolster theory that quantum fluctuations drive strange electronic phenomena January 30th, 2015

Everything You Need To Know About Nanopesticides January 30th, 2015

DNA nanoswitches reveal how life's molecules connect: An accessible new way to study molecular interactions could lower cost and time associated with discovering new drugs January 30th, 2015

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE