Inexpensive sensor measures ripeness of fruit

As fruit matures, it releases a gas known as ethylene, that causes the ripening process to begin. Once that process is under way, more ethylene is released, kicking the ripening into high gear. Currently, produce warehouses use expensive technologies such as gas chromatography or mass spectroscopy to measure ethylene levels, in order to gauge the ripeness of fruits that are in storage. A scientist from MIT, however, is developing small, inexpensive ethylene sensors that could be used in places such as supermarkets. There, they could let shopkeepers know which batches of fruit need to sold the soonest, in order to minimize spoilage.

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