Researchers create method that can quickly and accurately detect infections

June 12, 2018 by Joanna Carver, University of Texas at San Antonio
New electrochemical method developed at UTSA to test the presence of a bacterial infection is faster and more accurate than methods currently on the market. Credit: The University of Texas at San Antonio

A new study by Waldemar Gorski, professor and chair of the UTSA Department of Chemistry, and Stanton McHardy, associate professor of research in chemistry and director of the UTSA Center for Innovative Drug Discovery, describes a method that could show quickly and accurately whether a person has been infected with harmful bacteria or other pathogens. Additionally, this new method shows the exact severity of infection in a person.

The most common of testing for infection in medical facilities is currently a strip that turns a certain color when infected fluids come into contact with it.

"The problem with this method is that it's imprecise," Gorski said. "The human eye is forced to judge the level of infection based on the hue and deepness of a color. It's difficult to make an accurate call based on that." Furthermore, roughly a third of samples cannot be tested because the fluids contain blood or are too opaque.

Other methods include microbiology or examining body samples under a microscope and counting , also known as leukocytes, which are an indicator of an infection. However, these can be slow processes and require more highly trained personnel.

Gorski, seeing a need for an easier and more rapid method of testing for infection, resolved to test an electrochemical approach, and sought out McHardy, a medicinal chemist. Together, they created molecules that bind to leukocyte enzymes and produce an electrical current to signal the presence of an infection.

Their new molecules are housed on a testing strip. After being contacted with infected bodily fluids, the strip is connected to a computer monitor that displays a clear range of electrochemical responses demonstrating the severity of an infection.

"The signs and symptoms people demonstrate aren't always reflective of the level of the infection they have," McHardy said. "This device could very easily show just how serious an infection is and make diagnosis a much quicker process, possibly preventing a more serious illness."

Gorski believes the method could be especially useful to people who have just undergone surgery, as it could determine definitively whether they have an from the procedure before it worsens.

To date, Gorski and McHardy have filed a patent for their invention, published two papers and plan to work with an engineer in the future to streamline its design.

Explore further: New method allows scientists to study how HIV persists

More information: Douglas Hanson et al, Synthesis and Characterization of Pyridine Compounds for Amperometric Measurements of Leukocyte Esterase, ChemBioChem (2018). DOI: 10.1002/cbic.201800164

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