Colour-changing sensor promises cheaper HIV detection
An ultra sensitive prototype sensor has been developed that could enable doctors to detect the early stages of diseases and viruses with the naked eye, and at a much cheaper cost than existing methods.
The visual sensor technology, developed by a team from Imperial College London, is said to be ten times more sensitive than the current gold standard methods for measuring biomarkers. These indicate the onset of diseases such as prostate cancer and infection by viruses including HIV.
The researchers say their sensor would benefit countries where sophisticated detection equipment is scarce, enabling cheaper and simpler detection and treatments for patients.
In the study, the team tested the effectiveness of the sensor by detecting a biomarker called p24 in blood samples, which indicates HIV infection.
Professor Molly Stevens, from the departments of materials and bioengineering at Imperial, noted: "It is vital that patients get periodically tested in order to assess the success of retroviral therapies and check for new cases of infection. Unfortunately, the existing gold standard detection methods can be too expensive to be implemented in parts of the world where resources are scarce.
"Our approach affords for improved sensitivity, does not require sophisticated instrumentation and it is ten times cheaper, which could allow more tests to be performed for better screening of many diseases."
The researchers also tested samples for the biomarker called Prostate Specific Antigen (PSA), which is an early indicator for prostate cancer. The team say the sensor can also be reconfigured for other viruses and diseases where the specific biomarker is known.
The sensor works by analysing serum, derived from blood, in a disposable container. If the result is positive for p24 or PSA, there is a reaction that generates irregular clumps of nanoparticles, which give off a distinctive blue hue in a solution inside the container. If the results are negative, the nanoparticles separate into ball-like shapes, creating a reddish hue. Both reactions can be easily seen by the naked eye.
According to Prof Stevens, the sensor proved so sensitive that it could even detect minute levels of p24 in samples where patients had low viral loads, which could not be diagnosed using existing tests such as the Enzyme-linked Immunosorbent Assay (ELISA) test and the gold standard nucleic acid based test.
"We have developed a test that we hope will enable previously undetectable HIV infections and indicators of cancer to be picked up, which would mean people could be treated sooner," commented Dr Roberto de la Rica, also from Imperial's departments of materials and bioengineering. "We also believe that this test could be significantly cheaper to administer, which could pave the way for more widespread use of HIV testing in poorer parts of the world."
The next stage of the research will see the team approaching not-for-profit global health organisations, which could provide strategic direction and funding for manufacturing and distributing the sensor to low income countries.
