vitamins are a type of organic substances necessary to maintain the normal life activities of living things. Organisms require very little vitamins, but they play an extremely important role, such as regulating metabolism. Therefore, the refrigerated food in the display cooler must ensure the activity of vitamins. Lack of vitamins can cause various diseases. Vitamins needed by the human body are mainly ingested from animal foods and plant foods. According to solubility, vitamins can be divided into two categories: fat-soluble vitamins and water-soluble vitamins. Fat-soluble vitamins include vitamin A, vitamin D, vitamin E, and vitamin K. They are insoluble in water but soluble in fat and fat solvents (such as benzene, ether, chloroform, etc.); water-soluble vitamins are divided into vitamin B and vitamin C. Subcategories, some subcategories or families also contain several vitamins such as vitamin B1, vitamin B2, vitamin B, vitamin B12 and so on.

Minerals (inorganic salts) All kinds of foods contain a small amount of minerals, which generally account for 0.3-1. Although its number is small, it is indispensable for maintaining the normal physiological functions of animals and plants. Animal foods contain large differences in the composition of inorganic salts according to different parts of the body. For example, the content of minerals in bones is 83, which are mainly in the form of calcium and magnesium phosphates and carbonates; serum minerals are mainly It exists in the form of sodium chloride (600/0-70% of the total ash), red blood cells contain iron; the liver contains alkali metal and alkaline earth metal phosphates and chlorides, and also contains iron; connective tissue contains calcium and magnesium phosphate Salt; the main part of the muscle is potassium phosphate, followed by sodium and magnesium phosphate. The main mineral components of plant foods are potassium, sodium, calcium, magnesium, iron and other phosphates, sulfates, silicates and oxides. The part of the plant storing nutrients (seeds, tubers, roots, etc.) contains more potassium, phosphorus, and magnesium, while the supporting part contains more calcium, while the leaves contain more magnesium. Minerals and protein coexist to maintain the osmotic pressure of various biological tissues, and at the same time form a buffer system with protein to maintain acid-base balance. The presence of minerals in food can make the freezing point of food juice lower than that of pure water.

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