A smartphone application could offer a cheap way for African farming communities to manage cancer-causing toxins produced by a fungus that grows on crops while building a 'big data' set to assist research on outbreaks.
The Lab-on-Mobile-Device (LMD) platform can detect aflatoxins as accurately as a laboratory test, but can be carried out anywhere at a fraction of the cost using a smartphone camera, according to
Field trials of LMD began in five locations in
The fungus that produces aflatoxin grows on various crops - such as maize and peanuts - in warm climates. The problem affects a quarter of food crops worldwide, according to the
Roughly five billion people in the developing world are likely to be exposed to aflatoxins, according to the
Efforts to control aflatoxin have been hampered by a technology/news/conference-calls-for-education-to-combat-aflatoxins-1.html" target="_blank">lack of adequate diagnostics, says Benoit Gnonlonfin, a food safety researcher working for a research initiative Biosciences eastern and central
Laboratory tests that can identify the toxin are expensive, costing at least
As a result, local regulatory agencies widely use cheaper immunoassay tests, which operate in a similar way to over-the-counter pregnancy tests, for on-location screening. But these can only indicate a positive or negative result via a colour change on test strips or in liquid substrates and so are unable to indicate the level of health threat.
"The immunoassay tests are semi-qualitative techniques and they are not very appropriate for making decisions about whether a batch of food is fit for consumption," he says. "We need more-advanced technologies that are also affordable."
Immunoassay tests are also prone to human error as some require precise timing and because low concentrations of aflatoxin might not trigger an obvious coloured response, according to Cooper. He says that LMD reduces these risks by analysing the shades of the coloured bands on test strips via a digital phone image.
After users photograph the test strip with the smartphone, the app then calculates the pixel density of the coloured band. The result shows how much aflatoxin is present, within a certain threshold, rather than merely giving a simple positive or negative result.
LMD is more sensitive than the human eye, boosting the accuracy of traditional immunoassay tests by a factor of 100, according to Cooper.
Data from the tests will also be automatically uploaded online to create real-time, open-access maps of aflatoxin outbreaks for research.
"Our goal is to be able to use the big data component of this," says Cooper. He hopes that, once a critical mass of people are using the app in various regions, he will be able to correlate those findings with other information - such as climate data - to build models that predict aflatoxin prevalence.
Gnonlonfin says it would also be helpful to have a risk map.
Each LMD test will cost about
Mobile Assay is also developing a prototype low-energy, lightweight ozone decontamination unit to treat infected crops. Cooper says the technology, often used in organic farming in
"You need to be able to couple diagnostics with treatments," says Cooper. "It's one thing to have an easy-to-use and low-cost diagnostic, but then there is the larger question of what to do when you find out that you have a problem. What we're trying to do is answer both questions."
Next week (5 November),
Several briefs examine effective detection and diagnostic technologies, including one on Blue Boxes, portable grain-testing tools that allow for on-the-spot testing of crops at any stage of the supply chain.
"The series provides a good way of bringing together up-to-date information on aflatoxins by experts," said
See a promotional video of the app.
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