MINIATURE AROMA SENSORS PUT A NOSE IN YOUR POCKET

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When you crack open a week-old box of Chinese takeout, you stick your nose in it. When you flip the tab on a brew that’s been sitting in the sun for a few days, you stick your nose in it. We use our noses to tell whether food is fresh or stale, and whether we think it’s safe to eat or not. But your nose probably can’t pick out a single disease-causing microbe or staleness-signaling chemical that appears in aged food.

Laser-printer sized machines with long names like “gas chromatographs” and “mass spectrometers” can identify food-spoiling agents, but cost thousands of dollars. For those of us who don’t work in a laboratory, researchers and entrepreneurs are experimenting with accessories that integrate freshness sensors with refrigerators, coffee grinders, and smart phones. They’re so-called electronic noses for your food.

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