美国明尼苏达大学的微生物学家近期发现了一种超强天然防腐剂，能够杀灭各类细菌，使食物在常温下也能保存很久。

Fresh food could be made to last for years after scientists discovered a natural preservative¹（防腐剂） capable of destroying a whole class of bacteria, including E.coli and listeria（李斯特菌属） .

There would also be no need to refrigerate（冷冻） produce treated with the preservative, called, bisin, which is produced by harmless bacteria.

They say that foods like milk, sausages and sandwiches containing the agent could be on the shelves within three years.

Ready meals, opened wine and fresh salad dressing² could also be safely consumed long after they were bought, say scientists.

Researchers at Minnesota University in the US discovered the substance from a culture of a harmless bacteria, Bifodobacterium longum, commonly found in the human gut³.

It is the first naturally occurring agent identified that attacks so-called gram-negative bacteria such as E.coli, salmonella and listeria.

Dan Sullivan, an Irish microbiologist who now works at the university, told The Sunday Times: "It seems to be much better than anything which has gone before. It doesn't compromise nutrient⁴ quality — we are not adding a chemical, we are adding a natural ingredient."

He and his team have patented the substance in the US.

Bisin is related to nisin, which attacks gram-positive bacteria, and is used in the manufacture of processed cheeses and meats. As such, it is generally recognised as safe and would not have to be pharmacologically tested.

It would not be able to prevent fruit and vegetables from rotting, however, as they decompose⁵ in a different way.

Further research is now ongoing⁶, looking at exactly how good it is at stopping bacteria from growing.

Meanwhile, a British wholesaler⁷ has begun to make sandwiches with a two-week shelf life, by replacing all the oxygen in the plastic packaging with nitrogen and carbon dioxide.

Ray Boggiana, a food technologist who helped develop the range for Booker, which supplies convenience stores, said: "The science is not new. It's all about using a protective atmosphere in the packaging."