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Nanotubes sniff out rotting fruit, your dorm room might be next
Our favorite ultra-skinny molecules have performed a lot of useful functions over the years, but keeping fruit flies away was never one of them. Now MIT scientists, with US Army funding, have discovered a way to give these nanotubes the canine-like sense of smell needed to stop produce spoilage and waste. Doping sheets of them with copper and polystyrene introduces a speed-trap for electrons, slowing them and allowing the detection of ethylene gas vented during ripening. A sensor produced from such a substance could be combined with an RFID chip, giving grocers a cheaper way to monitor freshness and discount produce before it's too late. If that works, the team may target mold and bacteria detection next, giving you scientific proof that your roommate needs to wash his socks.
Fraunhofer Institute's fruit checker device tracks optimum ripeness so you can stop sniffing those melons
Researchers at the Fraunhofer Institute have developed a small device that can be used to check the freshness of fruit, telling the interested parties whether it's ripe or not. Based on previous technologies which measure -- for example -- car emissions, the device measures the volatile gases emitted by the fruit and analyzes its makeup to determine the state of freshness. The team already has a working prototype, and sees the device, which would cost somewhere in the thousands of dollars range, as having widespread application for businesses that supply food to grocery stores. So far the device has only successfully been used to test the freshness of fruit, but researchers see possible future applications in testing meat as well.
