Could blue LEDs preserve food without chemicals?

Blue light-emitting diodes (LEDs) show promise as a chemical-free way to preserve food, according to new research. The LEDs work best in cold temperatures of 4°C and 15°C (about 39-57°F) and mildly acidic conditions of around pH 4.5, say the scientists. Acidic foods such as fresh-cut fruits and ready-to-eat meat can be preserved under blue LEDs in combination with chilling temperatures without requiring further chemical treatments that are commonly needed for food preservation.