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白菜素有菜中之王之称,含有丰富的营养和维生素。可是,好多健康知识都提醒大家,隔夜的剩白菜不能吃。这种说法是正确的。那么它的科学道理是什么?新鲜白菜含有大量无毒的硝酸盐类,做熟后如放置较久,由于细菌的作用,会使硝酸盐还原成毒性很强的亚硝酸盐,而且放置时间越长亚硝酸盐含量越高。这种亚硝酸盐进入血液,使正常的血红蛋白氧化成高铁
Cabbage known as the king of the food, is rich in nutrients and vitamins. However, a lot of health knowledge to remind everyone that the remaining leftover cabbage can not eat. This is correct. So what is its scientific truth? Fresh cabbage contains a large number of non-toxic nitrate, as cooked, such as placed for a long time, due to the role of bacteria, the nitrate will be reduced to highly toxic nitrite, and place the time The longer the nitrite content. This nitrite enters the bloodstream, oxidizing normal hemoglobin to high iron