RE: CE Mark4 May 2021 15:10
"They are not using ActiPix for the Covid test. As per the September RNS"
I think you misunderstand what the September RNS is talking about. I refer you to the RNS of 6 June 2020:
"Concept
The test involves the deployment of a DNA aptamer - a short, single-stranded DNA molecule that adopts a shape that is complementary to that of the virus surface protein. By coating a test surface with millions of copies of the aptamer molecule, Paraytec's CAPTURE module can trap Covid-19 virus particles from a swab sample, as they flow over the test surface. Trapped viruses are then instantaneously coated with the SIGNAL GENERATION module, a synthetic chimeric protein, that both recognises the viral surface as well as being highly fluorescent. The resultant fluorescent signal is measured by the DETECTION module using a version of Paraytec's patented Actipix area imaging technology configured for fluorescence detection.
Technical Summary
In order to avoid using live Coronavirus in the lab during proof of concept, an artificial version of the virus is used, the surface of which mimics the Covid-19 virus, by displaying the precise protein (SPIKE) on it that the virus uses to gain access to human cells. The CAPTURE module comprises a fluidics system in which a specialised surface is coated with the COVID-19 DNA aptamer. Virus particles are trapped on the surface by the DNA aptamer. In order to detect trapped virus, Paraytec's SIGNAL GENERATION module uses a synthetic bi-functional protein, that both recognises the virus as well as emitting light. This enables trapped viruses to be visualised by a version of Paraytec's ActiPix system that detects UV and visible light as well as fluorescence. The CAPTURE/SIGNAL GENERATION modules, in the presence of the virus SPIKE coat protein, generates a specific light signature, which may be detected by ActiPix.
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WP3 Construction of SIGNAL GENERATION module
In order to detect trapped virus, a synthetic bi-functional protein is used, that both recognises the virus as well as emitting light. This enables trapped viruses to be visualised by a version of Paraytec's ActiPix system that detects UV and visible light as well as fluorescence.
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WP5 Configuration of ActiPix for fluorescence signal DETECTION
Adapt the currently available ActiPix system with appropriate fluorescence excitation and emission filters. Build system with flow-through cuvette and test designs for a disposable cartridge.
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