Fresh produce is a major vehicle for noroviruses, a group of viruses that are the most common cause of gastroenteritis in developed countries.
However, the viruses are quite resistant to cold pasteurization treatments such as irradiation, which are used to destroy bacteria, moulds, parasites, and insects. The irradiation process uses gamma rays or X-rays to destroy these viruses but at the dose needed to eliminate them, it can affect the physicochemical properties of fresh produce.
Professor Monique Lacroix, a researcher at Institut National de la Recherche Scientifique (INRS), has developed an edible coating based on cranberry juice and citrus extract that makes noroviruses more sensitive to gamma irradiation, making it possible to eliminate them while preserving the quality of food, all without risk to consumers.
A Fruit Extract Spray
The idea is to spray fresh produce such as lettuce or strawberries and then treat it with cold pasteurization such as irradiation. The organic acids and polyphenol in cranberry juice and citrus extract would alter the viral protein and help inhibit its activity.
Read more at Institut National de la Recherche Scientifique - INRS
Image: This is a norovirus cell culture. (Credit: Monique Lacroix, INRS)