Cheaper, faster diagnostic test

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Cheaper, faster diagnostic test



Researchers at Queen’s University Belfast have developed a highly innovative new enzyme biomarker test that has the potential to indicate diseases and bacterial contamination saving time, money and possibly lives.


The test, developed by scientists at the Institute for Global Food Security at Queen’s, can detect enzyme markers of disease known as proteases in humans, animals and food products.

Proteases are crucial for microorganism growth and are responsible for the progression of many diseases.
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Levels of proteases can be highly elevated in the urine of patients with diabetic kidney disease, or at the sites of infected wounds. In food, proteases produced by bacteria contaminated in meat and dairy products can lead to rancidity, as well as decreased shelf life and quality.
Current protease detection methods are costly, time-consuming and are not always effective.
Dr Claire McVey, Queen’s researcher and co-author on the study published in leading journal Nano Research, explain that not only is the test cheap to produce, but it can be used anywhere and is not reliant on laboratory conditions. “Eliminating the need to carry out tests in a laboratory setting is life-changing. As well as being cost-effective, it means faster diagnosis.”
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The gold-nanoparticle based nanosensor devised by Queen’s researchers indicates when proteases are present through a visible colour-change reaction.
Gold nanoparticles are well known for their capability in speeding up the oxidization of a chemical called tetramethylbenzidine (TMB), visible through a vivid blue-colour formation.
Dr Cao, the lead academic on the study notes that when TMB is added to the casein-covered gold nanoparticles, it is possible to tell virtually instantly if proteases are present by whether or not the solution turns blue. Normally such testing takes much longer.
Using this approach, proteases can be detected within 90 minutes without the need for complicated or expensive laboratory equipment.
“Following full validation of this test, we would like to explore how we could expand the application to detect a host of other diseases or contaminated foods. This new approach will enable the identification of enzyme biomarkers at the point of care. It could change the landscape of how enzyme biomarkers are detected and diagnosed, making an impact not only on food safety, but on the diagnosis of enzyme-related illnesses among animals and humans. The potential scope for this test is huge.”
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Said Professor Elliott, founder of the Institute for Global Food security and a co-investigator in the study: “The ability to diagnose disease or contamination quickly can have a huge impact on how serious problems can be dealt with. The ultra-low cost of the system will help reduce costs of testing and could transform the amount of testing performed in the developing world.”Source:
https://www.vanguardngr.com/2019/01/cheaper-faster-diagnostic-test/

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