Canning food means that the processed food is put into tin-plated thin-plate cans, glass cans or other packaging containers, sealed and sterilized, and the food that can be preserved for a long time at room temperature after sterilization is called canned food, which is also called canned food for short.
According to the definition of Zhang Xueyuan, a famous food expert in China and former Ministry of Light Industry, canned food is a kind of food whose preservation principle is sealed sterilization, which meets the requirements of commercial sterility and does not need or allow any preservatives to be added.
Preservatives are not needed in the production of canned puffed materials.
Lin Yuhui, executive vice president of canned food professional committee of China Food Industry Association, said that except for a few vitamins with low heat resistance (mainly VC, VB6, VB9, etc. ), carbohydrates, protein, fat, vitamins (VB 1, VB2, VA, VD, VE, etc. ) and trace elements in canned food will not be destroyed;
Protein solidification is one of its characteristics, but it will not decompose and "deteriorate"; Its long storage time at room temperature is caused by commercial sterilization, and the related products meet the national food safety standard GB7098-20 15, "The use of food additives should meet the requirements of GB2760".
However, in GB2760 National Standard for Additives, there is no word suitable for "canned" after food preservatives such as benzoic acid and its salts, sorbic acid and its salts, and sodium dehydroacetate. Therefore, it is unnecessary and impossible to add preservatives in canned food production. It is a rumor that canned food "nutrition is destroyed" and "preservatives are used in large quantities".
The sugar added in canned fruit is mainly to adjust the sugar-acid ratio of canned fruit to make it taste better. The statement that online canned food "too much sugar leads to obesity" is completely unfounded.
Generally speaking, the shelf life of canned food depends on the variety, packaging materials and processing technology. Usually it can be preserved for a long time without deterioration, but its best edible period is 1-5 years. "Canned food makes people old" has neither theoretical basis nor actual cases, which is a false proposition in itself.
Baidu encyclopedia-canned food
People's Daily Online-18 Canning enterprises use legal weapons to crack down on food safety network rumors.