许多人都有这样的习惯:把没吃完的蔬菜、水果放在塑料袋内保存。这是冬季常用的一种科学保鲜方法,其原理是降低氧的浓度,增加二氧化碳的浓度,使果蔬处于休眠状态,延长储存期。然而,采用这种办法储存的时间不宜过长。这是因为蔬菜、水果为有机食物,不仅水分含量较高,而且含有水溶性物质和酶类。在整个储存期间,果蔬仍进行着很强的呼吸活动,在有氧的情况下,果蔬中的糖类或者其他有机物质氧化分解,产生二氧化碳和水分,并放出大量热量。在缺 Many people have the habit of eating vegetables, fruits, and other fruits in plastic bags. This is a commonly used method of scientific preservation in winter. The principle is to reduce the concentration of oxygen and increase the concentration of carbon dioxide, so that the fruits and vegetables are in a dormant state and prolong the storage period. However, this method should not be stored for too long. This is because vegetables, fruits and organic foods, not only high moisture content, but also contains water-soluble substances and enzymes. Throughout the storage period, fruits and vegetables are still breathing strongly. Under aerobic conditions, sugars and other organic substances in fruits and vegetables oxidize and decompose, generating carbon dioxide and moisture and releasing a large amount of heat. In the absence