Tin cans are opaque
In addition to the deterioration of food, light can also cause changes in proteins and amino acids. Vitamin C is more likely to be exposed to light and cause it to interact with other food ingredients, leading to a large loss. According to research analysis, the loss of vitamin C in transparent glass bottle is 14 times higher than that of dark bottled milk. The light will also cause milk to produce oxidative odor, and the nucleus, methionine, etc. will lose nutritional value The opacity of tinplate makes vitamin C the highest preservation rate.
Tin cans have good sealability
The barrier properties of packaging containers to air and other volatile gases are very important for the preservation of nutritional content and sensory quality. Comparison of various juice packaging containers proves that the oxygen transmission rate of the container directly affects the browning of the juice and the preservation of vitamin C; the preservation of vitamin C in metal cans, glass bottles, aluminum foil laminates, and cartons with low oxygen transmission rates Better, of which tin cans are the best.
Reduction of tin in tin cans
The tin on the inner wall of tinplate interacts with the oxygen remaining in the container during filling, reducing the chance of food ingredients being oxidized. The reduction of tin has a good preservation effect on the flavor and color of light-colored fruits and juices. Therefore, the use of unpainted iron cans has better nutrition preservation than other packaging cans, and the brown changes are slight. The acceptability of flavor quality is good, and the shelf life is extended accordingly.