Light will lead to the deterioration of the food reactions, and it can also cause changes in protein and amino acids. Vitamin C by making it easier to light the role with other food ingredients, resulting in a huge loss. According to the research analysis showed transparent glass bottles of milk, vitamin C losses dark bottled milk higher than 14 times, the light also causes oxidation of milk smell, as well as radionuclides, such as cracking and loss of methionine nutritional value, tinplate cans opacity makes the highest rates of vitamin C saved.
Packaging containers is very important barrier to air and other volatile gases preservation of nutrients and sensory quality. Comparison of various fruit juices proof containers, container oxygen transmission rate directly affects the preservation of juice browning and vitamin C; oxygen through the low metal cans, glass bottles and plastic laminated aluminum foil, paper preservation of vitamin C well, among the best cans.
Reduction of tin
Tin tin filled with the inner wall will remain in the role of oxygen in the container, reduce the chance of food ingredients to be oxidized. Reduction of tin on the pale fruit juice flavor and color have a good preservation effect, and therefore do not use canned juice cans painted iron than other packaging materials juice cans filled with better nutrition preservation, brown slight change, acceptance flavor quality is better, and thus extend the storage period.
Provide an effective source of iron
Tin plate canned food, except for a few light-colored fruits and canned fruit juice, but most use the internal paint cans in order to improve the corrosion properties of the container; due to the electrochemical reaction of metal, paint cans, canned food will be stored in small amounts in dissolution of iron to ferrous iron exists in the form of sealed canned food, it is easy to be absorbed by the body, the content of about 1 to 10 ppm. Fruit and vegetables products, raw iron content itself is not much, cans products to 350 ml per pot beverage cans, iron content of 5 ppm calculated per tank provides 1.75mg of iron, about human daily intake of 18mg the tenth. If these fruit and vegetable juice beverage cans are rich in vitamin C, iron is more easily absorbed, and thus iron canned food and beverages after all a good source of iron, cans of food to provide nutrition for more far-reaching.
Because it has these properties, and therefore provide an addition to the hot tin cans outside, completely isolated from environmental factors closed system, avoid food color due to light, oxygen, moisture and deterioration, not because of the aroma fades or by the environment through smell through over pollution taste, food storage stability better than other packaging materials, the highest saving rates of vitamin C, the preservation of nutrients is also the best.