Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Oregon chemists moving forward with tool to detect hydrogen sulfide

25.06.2013
Newly developed approach could benefit basic medical research and find H2S in the environment

University of Oregon chemists have developed a selective probe that detects hydrogen sulfide (H2S) levels as low as 190 nanomolar (10 parts per billion) in biological samples. They say the technique could serve as a new tool for basic biological research and as an enhanced detection system for H2S in suspected bacterially contaminated water sources.

Hydrogen sulfide, a colorless gas, has long been known for its dangerous toxicity -- and its telltale smell of rotten eggs -- in the environment, but in the last decade the gas has been found to be produced in mammals, including humans, with seemingly important roles in molecular signaling and cardiac health. Detection methods for biological systems are emerging from many laboratories as scientists seek to understand the roles of H2S in general health and different diseases.

Reporting in the Journal of Organic Chemistry -- online in advance of regular print publication -- researchers in the UO lab of Michael D. Pluth, professor of chemistry, describe the development of a colorimetric probe that relies on nucleophilic aromatic substitution to react selectively with H2S to produce a characteristic purple product, allowing for precise H2S measurement.

"This paper describes a new way to selectively detect H2S," said Pluth, who has been pursuing detection methods for the gas under a National Institutes of Health "Pathway to Independence" grant. That early career award began while he was a postdoctoral researcher at the Massachusetts Institute of Technology. "This technique allows you to use instruments to quantify how much H2S has been produced in a sample, and the distinctive color change allows for naked-eye detection."

In biological samples, he said, the approach allows for a precise measurement. In the environment, he added, the technique could be used to determine if potentially harmful H2S-producing bacteria are a contaminant in water sources through the creation of testing kits to detect the gas when levels are above a defined threshold.

The key to the technique, said the paper's lead author, doctoral student Leticia A. Montoya, is the reaction process in which the probe reacts with H2S to produce a distinctly identifiable purple compound. "This method allows you look selectively at hydrogen sulfide versus any other nucleophiles or biological thiols in a system," Montoya said. "It allows you to more easily visualize where H2S is present."

The chemical reaction produced in the experiments, Pluth said, also holds the potential to be applied in a variety of materials, on surfaces and films, with appropriate modifications. The UO has applied for a provisional patent to cover the technology.

The study is the second in which Pluth's lab has reported potential detection probes for H2S. Last year, in the journal Chemical Communications, Montoya and Pluth described their development of two bright fluorescent probes that sort out H2S from among cysteine, glutathione and other reactive sulfur, nitrogen and oxygen species in living cells.

"We're really interested in making sharper tools," Pluth said. "We have the basic science worked out, and now we want to move forward to fine-tune our tools so that we can better use them to answer important scientific questions."

"University of Oregon researchers are helping to foster a more sustainable future by developing powerful new tools and entrepreneurial technologies," said Kimberly Andrews Espy, vice president for research and innovation and dean of the UO graduate school. "This important research from Dr. Pluth's lab may someday alert us to environmental contaminants and could also impact basic science and human health."

Co-authors with Montoya and Pluth on the newly published paper were UO undergraduate students Taylor F. Pearce and Ryan J. Hansen, and Lev N. Zakharov of the UO-based Center for Advanced Materials Characterization in Oregon (CAMCOR). The NIH grant to Pluth (R00 GM092970) came from the National Institute for General Medical Sciences. The research also utilized UO-based nuclear magnetic resonance facilities that are supported by the National Science Foundation (ARRA CHE-0923589).

About the University of Oregon

The University of Oregon is among the 108 institutions chosen from 4,633 U.S. universities for top-tier designation of "Very High Research Activity" in the 2010 Carnegie Classification of Institutions of Higher Education. The UO also is one of two Pacific Northwest members of the Association of American Universities.

Sources:

Michael D. Pluth
assistant professor of chemistry
541-346-7477
pluth@uoregon.edu
Leticia A. Montoya
doctoral student, chemistry
lmontoya@uoregon.edu
Links:
Pluth faculty page: http://chemistry.uoregon.edu/fac.html?pluth
Pluth lab: http://pages.uoregon.edu/pluth/
Department of Chemistry: http://chemistry.uoregon.edu
Follow UO Science on Facebook: http://www.facebook.com/UniversityOfOregonScience
UO Science on Twitter: http://twitter.com/UO_Research
More UO Science/Research News: http://uoresearch.uoregon.edu
Note: The University of Oregon is equipped with an on-campus television studio with a point-of-origin Vyvx connection, which provides broadcast-quality video to networks worldwide via fiber optic network. In addition, there is video access to satellite uplink, and audio access to an ISDN codec for broadcast-quality radio interviews.

Jim Barlow | EurekAlert!
Further information:
http://www.uoregon.edu

More articles from Life Sciences:

nachricht Researchers identify potentially druggable mutant p53 proteins that promote cancer growth
09.12.2016 | Cold Spring Harbor Laboratory

nachricht Plant-based substance boosts eyelash growth
09.12.2016 | Fraunhofer-Institut für Angewandte Polymerforschung IAP

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>