New Sensor Uses `Glow-in-the-Dark` Signal to Indicate Presence of Molecules Associated with COVID-19 in Blood

The new sensor uses a “glow-in-the-dark” signal to indicate the presence of tiny amounts proteins and anti-drug antibodies, as well as COVID-19 spike proteins and antibodies in blood.

Home test kits to check for COVID-19 spike proteins and anti-COVID-19 antibodies are fast and simple to use but lack the sensitivity and accuracy of laboratory tests. Another issue with these so-called point-of-use home tests is that they are not accurate enough. With all of this in mind, the research team developed a new test approach with the accuracy and sensitivity of current laboratory-based methods and the speed and low-cost of existing point-of-use tests. The key to detecting and indicating the presence of biomarkers or molecules of interest is bioluminescence, the process that organisms such as fireflies use to produce light. The researchers tested the new sensing approach on a variety of biomarkers, including one to detect bacterial and viral infections (C-reactive protein), using 40 patient samples.

The RAPPID testing platform is definitely rapid in nature, and with a suitable sample holder can be used in conjunction with a smartphone, meaning that it has the potential to be used by anyone, anywhere. However, some work still needs to be done before his new testing platform will become available to the wider public.

“Our new sensor is based on bioluminescence, which we have used extensively in our previous research. If a certain protein or antibody is present in the sample, special proteins called luciferase enzymes will emit light,” said Maarten Merkx from the institute for Complex Molecular Systems (ICMS) at TU/e and research lead for the new study. “In other words, we look for a ‘glow-in-the-dark’ response.”

“We envisage that this testing platform could be used for a broad range of applications such as in rapid screening and testing, for therapeutic antibody-drug monitoring associated with conditions like rheumatoid arthritis and inflammatory bowel disease, and for the rapid detection of infectious diseases that could be associated with future epidemics or pandemics,” added Merkx.

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Eindhoven University of Technology
Utrecht University