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。据悉,这种防腐剂名叫“比辛”,是从一些无害细菌中自然产生的。这种防腐剂能够阻止肉、鱼、蛋和奶制品腐坏,对已开启的红酒和沙拉酱也同样有效。添加了这种天然防腐剂的食品甚至不需要放入冰箱,在常温下就可以保质数年。不过,由于蔬菜和水果的机能不同,该防腐剂不能对其起到保鲜作用。研究人员表示,这种天然防腐剂比之前的任何一种都要好,因为它不会破坏食物的营养成分,也没有任何化学成分被添加到食品当中,它只是一种天然成分。目前,研究人员已经在美国为“比辛”申请了专利。添加了“比辛”的牛奶、香肠及三明治等产品有望在三年内上市。
Fresh food could be made to last for years after scientists discovered a natural preservative capable of destroying a whole class of bacteria, including E.coli and listeria.
There would also be no need to refrigerate 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 dressing 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 gut.
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 nutrient 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 decompose in a different way.
Further research is now ongoing, looking at exactly how good it is at stopping bacteria from growing.
Meanwhile, a British wholesaler 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."
高效备考雅思听力并提升英语本领的策略
雅思听力常考英美国家的地名
雅思听力考试中的停顿时间
雅思听力训练应培养猜字能力
有效提高雅思听力水平的五种方法
全方位突破提高雅思听力
雅思听力名词复数形式的细节不可忽视
雅思听力中的“一分钟恐怖”和“连续作战”
雅思听力section 1中的经典陷阱分析
避免雅思听力出现失误的应对方法
教学经验:“三级跳”有效提高雅思听力水平
详解雅思听力中的三大数字考点
雅思听力大小写的问题不可忽视
雅思听力训练需要做到三原则和四个字
词汇联想法助你突破雅思听力词汇
为什么雅思听力第二遍才能听懂?
雅思听力的三个特点及难点指导
雅思听力三关难不倒:磨耳朵也要讲方法
雅思听力不可忽视听说能力的锻炼
雅思听力高分备考的两个要点
如何合理利用雅思听力的停顿时间
雅思听力通关秘笈:注意关键小词
雅思听力陷阱词之条件词
雅思听力障碍重重?原来是连读在作怪
雅思听力多选题的选项怎么分析?两步走
雅思听力特点:文章场景性强 专业话题多
雅思听力字数限制问题不可忽视
详解雅思听力中的顺序原则与重复原则
雅思听力答案拼写和缩写问题不可忽视
如何应对雅思听力中的填空题
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |