Canned food has two characteristic. One is used professional disinfect to prevent harmful microorganisms to sire, so it doesn’t need to add preservatives. Food can be preserved in homoeothermy long time. The other is not only use airtight container to prevent outer microorganism entered, but also prevent food to rot.
Canned food isn’t only metal cans. It can prevent microorganisms entered after you seal the container. Glass bottles or soft bags can manufactured canned food, for example, canned pickles, mushroom and noodles. Canned food is used by professional disinfect.
Canned food can be preserved in two or three years, but do not let canned food sunned. If canned food is put too long, taste would be decline. So consumers need to finish quickly as soon as possible. (This article was published on udn news2016/7/6)