Egg-based edible preservative keeps perishables fresh

The antimicrobial coating extends the shelf life of fruits and vegetables and diverts eggs from landfill

Spotted: A team from Rice University researchers have discovered a way to use the 200 million eggs that go to waste each year in the United States. Using both yolks and egg whites, the scientists created an edible, water-soluble protein coating that keeps food fresh for longer. Proteins are relatively good for the human body, which means the new preservative is not only better for the environment, but is also healthier to consume.

The preservative currently used most frequently is wax, which is fat-based and found on most supermarket produce. In tests, the egg-based coating’s preservation was comparable to that of wax. For consumers who cannot eat egg, the coating washes off in water. Consisting of 70 per cent egg, the other 30 per cent of the coating is a mix of ingredients that include cellulose and curcumin. The cellulose is made from wood and creates a barrier to water, which helps the food stay hydrated. Curcumin is the main active ingredient in turmeric and provides the antifungal qualities that help slow the ripening process.

Continued work on the preservative includes looking for additional agricultural waste products that could be used similarly. The team is also investigating plant-based proteins.

Reducing food insecurity is a cornerstone of broad global social improvements, and part of that involves reducing food waste. Springwise has spotted an edible nanofilm that can coat up to a tonne of food for only €1 to €2, and a nanosensor that tracks the plant growth hormone that indicates ripeness.

Explore more: Food & Drink Innovations | Sustainability Innovations