1, foods rich in vitamin B2: milk and its products, animal liver and kidney, egg yolk, eel, spinach, carrots, brewing yeast, mushrooms, laver, eggplant, fish, celery, oranges, tangerines, oranges, etc.
2. The main food sources of vitamin B2 (riboflavin) are lean meat, liver, egg yolk, brown rice and green leafy vegetables. Millet contains a lot of vitamin B2.
vitamin B2
I. Introduction
1 and vitamin B2 (chemical formula: C 17H20N4O6, formula amount: 376.37) are also called riboflavin, which is slightly soluble in water and stable when heated in neutral or acidic solutions. It is a component of flavases in vivo (flavases play a role in hydrogen transfer in biological oxidation and reduction), and when it is lacking, it will affect the biological oxidation of the body and cause metabolic disorders. Its pathological changes are mostly manifested as inflammation of mouth, eyes and external genitalia, such as angular stomatitis, cheilitis, glossitis, conjunctivitis and bursitis, so this product can be used for the prevention and treatment of the above diseases. The storage of vitamin B2 in the body is very limited, so it should be provided by diet every day.
2. Two properties of vitamin B2 are the main reasons for its loss: (1) can be destroyed by light; (2) Heating in alkaline solution can be destroyed.
Second, the physical properties
Water-soluble vitamin, but slightly soluble in water, the solubility is 12mg/ 100mL at 27.5℃. Soluble in sodium chloride solution, soluble in dilute sodium hydroxide solution, soluble in alkaline solution and stable in strong acid solution. Heat and oxidation resistance. Light and ultraviolet radiation cause irreversible decomposition.
3. Physiological function
It is mainly related to the active * * * yoke double bond on 1,5-position n of isoxazine in vitamin B2 molecule, which can be used as both a hydrogen donor and a hydrogen donor. In human body, flavin adenine dinucleotide (FAD) and flavin mononucleotide (FMN) participate in redox reaction, which plays the role of hydrogen transfer and is the auxiliary group of some important redox enzymes in the body, such as succinate dehydrogenase, xanthine oxidase and NADH dehydrogenase.
The main biochemical reactions involved are energy production of respiratory chain, oxidation of amino acids and lipids, conversion of purine base into uric acid, hydroxylation of aromatic compounds, synthesis of protein and some hormones, transport, storage and mobilization of iron, and participation in metabolism of folic acid, pyridoxal and nicotinic acid.
1, participates in biological oxidation and energy metabolism in vivo, which is related to the metabolism of carbohydrate, protein, nucleic acid and fat. It can improve the utilization rate of protein, promote growth and development, and maintain the integrity of skin and cell membrane. It has the function of protecting skin, hair follicle mucosa and sebaceous glands.
2. Participating in the growth and metabolism of cells is an essential nutrient for the metabolism and repair of body tissues, such as strengthening liver function and regulating the secretion of adrenaline.
3. Participating in the metabolism of vitamin B6 and nicotinic acid is a model of the coordination of B vitamins. FAD and FMN, as auxiliary groups, participate in the transformation of tryptophan into nicotinic acid and vitamin B6 into pyridoxal phosphate.
4. It is related to the absorption, storage and mobilization of iron.
5. It also has antioxidant activity, which may be related to flavase-glutathione reductase.
References:
Baidu Encyclopedia-Vitamin b2