| Dec 27, 2019 |
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(Nanowerk News) A device to quickly capture and identify various strains of virus has been developed, according to researchers at Penn State and New York University (PNAS, “A rapid and label-free platform for virus capture and identification from clinical samples”).
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Currently, virologists estimate that 1.67 million unknown viruses are circulating in animal reservoirs, a number of which can be transmitted to humans. Known viruses, such as H5N1, Zika and Ebola have caused widespread illness and death. The world Health Organization states that early detection can halt virus spread by enabling rapid deployment of countermeasures.
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| A nanotube array decorated with gold nanoparticles captures virus molecules. (Image: Terrones Lab/Penn State)
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We have developed a fast and inexpensive handheld device that can capture viruses based on size, said Mauricio Terrones, Distinguished Professor of Physics, Chemistry and Materials Science and Engineering, Penn State. Our device uses arrays of nanotubes engineered to be comparable in size to a wide range of viruses. We then use Raman spectroscopy to identify the viruses based on their individual vibration.
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This device, called a VIRRION, has a wide range of possible uses. For farmers, for example, early detection of a virus in the field can save an entire crop. Early detection of a virus in livestock can save a herd from illness. Humans also will benefit by the fast detection of virus, in minutes rather than days with current methods. Because of its size and cheapness, such a device would be useful in every doctors office as well as in remote locations in the field when disease outbreaks occur.
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Most current techniques require large and expensive pieces of equipment, Terrones said. The VIRRION is a few centimeters across. We add gold nanoparticles to enhance the Raman signal so that we are able to detect the virus molecule in very low concentrations. We then use machine learning techniques to create a library of virus types.
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According to Professor Elodie Ghedin, a virologist at NYU, “The VIRRION enables the rapid enrichment of virus particles from any type of sample–environmental or clinical–which jumpstarts viral characterization. This has applications in virus emergence, virus discovery, and in diagnosis. Eventually, we hope to use this device for the capture and sequencing of single virions, giving us a much better handle on the evolution of the virus in real-time.”
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Added lead author Ying-Ting Yeh, an assistant research professor in the Terrones group, “We synthesized a gradient of aligned carbon nanotube forest arrays to capture different viruses according to their size and detect them in-situ using Raman spectroscopy. We designed and assembled a portable platform that enriches virus particles from several milliliters of clinical samples in a couple of minutes.
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