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From 2012.igem.org

The Food Warden
The Food Warden is a system which detects meat spoilage. It uses Bacillus subtilis cells. Their natural genetic response to the gases of rotten meat has been identified and linked to a pigment production system. In this way, a consumer can easily see when the meat is spoiled: it's rotten and you know it!
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Stop the food waste!
Every year, 1,300,000,000 tons of food are thrown away worldwide. This is one third of the global food production. One of the reasons for this is the fact that best before dates are imprecise. A reliable way of monitoring whether food is spoiled or not could save up to 600 euro per household per year.
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Our main results
This busy and exciting summer we managed to successfully couple fnr and sboA promoters with the reporter genes in a B. subtilis plasmid backbone designed by our team. Our bacteria - even when closed in a sticker - respond to rotten meat volatiles and produce a pigment output visible by naked eye. We have constructed the Food Warden! But there is more...
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