New Device Offers Faster Way to Detect Antibiotic-Resistant Bacteria

Antibiotic-Resistant Bacteria Testing Device

Seokheun “Sean” Choi, an associate professor of electrical and computer engineering, has developed a new device for faster testing of antibiotic-resistant bacteria. Credit: Seokheun “Sean” Choi

Method measures naturally occurring electron transfers.

Bacterial infections have become one of the biggest health problems worldwide, and a recent study shows that COVID-19 patients have a much greater chance of acquiring secondary bacterial infections, which significantly increases the mortality rate.

Combatting the infections is no easy task, though. When antibiotics are carelessly and excessively prescribed, that leads to the rapid emergence and spread of antibiotic-resistant genes in bacteria — creating an even larger problem. According to the Centers for Disease Control and Prevention, 2.8 million antibiotic-resistant infections happen in the U.S. each year, and more than 35,000 people die from of them.

One factor slowing down the fight against antibiotic-resistant bacteria is the amount of time needed to test for it. The conventional method uses extracted bacteria from a patient and compares lab cultures grown with and without antibiotics, but results can take one to two days, increasing the mortality rate, the length of hospital stay and overall cost of care.

Associate Professor Seokheun “Sean” Choi — a faculty member in the Department of Electrical and Computer Engineering at Binghamton University’s Thomas J. Watson College of Engineering and Applied Science — is researching a faster way to test bacteria for antibiotic resistance.

“To effectively treat the infections, we need to select the right antibiotics with the exact dose for the appropriate duration,” he said. “There’s a need to develop an antibiotic-susceptibility testing method and offer effective guidelines to treat these infections.”

In the past few years, Choi has developed several projects that cross “papertronics” with biology, such as one that developed biobatteries using human sweat.

This new research — titled “A simple, inexpensive, and rapid method to assess antibiotic effectiveness against exoelectrogenic bacteria” and published in November’s issue of the journal Biosensors and Bioelectronics — relies on the same principles as the batteries: Bacterial electron transfer, a chemical process that certain microorganisms use for growth, overall cell maintenance and information exchange with surrounding microorganisms.

“We leverage this biochemical event for a new technique to assess the antibiotic effectiveness against bacteria without monitoring the whole bacterial growth,” Choi said. “As far as I know, we are the first to demonstrate this technique in a rapid and high-throughput manner by using paper as a substrate.”

Working with PhD students Yang Gao (who earned his degree in May and is now working as a postdoctoral researcher at the University of Texas at Austin), Jihyun Ryu and Lin Liu, Choi developed a testing device that continuously monitors bacteria’s extracellular electron transfer.

A medical team would extract a sample from a patient, inoculate the bacteria with various antibiotics over a few hours and then measure the electron transfer rate. A lower rate would mean that the antibiotics are working.

“The hypothesis is that the antiviral exposure could cause sufficient inhibition to the bacterial electron transfer, so the readout by the device would be sensitive enough to show small variations in the electrical output caused by changes in antibiotic effectiveness,” Choi said.

The device could provide results about antibiotic resistance in just five hours, which would serve as an important point-of-care diagnostic tool, especially in areas with limited resources.

The prototype — built in part with funding from the National Science Foundation and the U.S. Office of Naval Research — has eight sensors printed on its paper surface, but that could be extended to 64 or 96 sensors if medical professionals wanted to build other tests into the device.

Building on this research, Choi already knows where he and his students would like to go next: “Although many bacteria are energy-producing, some pathogens do not perform extracellular electron transfer and may not be used directly in our platform. However, various chemical compounds can assist the electron transfer from non-electricity-producing bacteria.

“For instance, E. coli cannot transfer electrons from the inside of the cell to the outside, but with the addition of some chemical compounds, they can generate electricity. Now we are working on how to make this technique general to all bacteria cells.”

Reference: “A simple, inexpensive, and rapid method to assess antibiotic effectiveness against exoelectrogenic bacteria” by lYang Gao, Jihyun Ryu, Lin Liu and Seokheun Choi, 20 August 2020, Biosensors and Bioelectronics.
DOI: 10.1016/j.bios.2020.112518

1 Comment on "New Device Offers Faster Way to Detect Antibiotic-Resistant Bacteria"

  1. Sekar Vedaraman | December 2, 2020 at 8:41 pm | Reply

    Very Interesting.

    However, the war against Bateria , Viruses and Other Pathogens cannot be fought as Localized battles. It need to become strategic and focus on Prevention rathee than Cure and Testing For Resistence deeloped by the Bacteria, Pathogen as they can probably mutate at a faster and faster rate in the future as they too learn with every tratment and appear to have memory and develop resistance the the various Chemical and Chemistry based Treatment we keep coming up with and develop alternate pathways to attack with greater ferocity next time around!.

    Medical Treatment needs to become much more Lead Indicator Oriented and Predicyive in Nature and employ non – chemical treatments to address the root causes of the potential illness and do so same systemically — Prior to Infection.

    The Strategic nature of the War is forgotten in the heat of the battle. Winning the battle is never bad, BUT winning the War is Far More Important. Read the Art of War By a Great Chinese General!.

    HOWEVER — THIS IS a very Promising Start. First Time I see theuse of a Device touching on the edges of Quantum — being used in Medical Testing and Monitoring along witth Cheap Enough paper detectors!! Well done Team.

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