Vitamin C is an essential nutrient for higher primates and other few organisms. In the body, vitamin C is an antioxidant that protects the body from the threat of free radicals. Vitamin C is also a coenzyme. Its wide range of food sources for various types of fresh fruits and vegetables vitamin C The role of the following points:
First, participate in the hydroxylation reaction. Hydroxylation is an essential step in the synthesis or decomposition of many important substances in the body. In the process of hydroxylation, vitamins must participate in the process.
1, promote collagen synthesis. In the absence of vitamin C, collagen synthesis is impaired, resulting in scurvy.
2. Promote the synthesis of neurotransmitters (5-hydroxytryptamine and norepinephrine).
3, promote steroid hydroxylation. Patients with high cholesterol should supplement sufficient amounts of vitamin C.
4. Promote the hydroxylation and detoxification of organic substances or poisons. Vitamin C can increase the activity of mixed-function oxidases and enhance the detoxification (hydroxylation) process of drugs or poisons.
Second, the reduction effect. Vitamin C ^ can be oxidized or reduced in the body, so it can be used as a hydrogen donor, but also as a hydrogen acceptor, plays an important role in the body's redox process.
1, to promote antibody formation. The high concentration of vitamin C helps to reduce the cystine in food protein to cysteine and synthesize antibodies.
2, promote the absorption of iron. Vitamin C can reduce the hard-to-absorb trivalent iron to easily absorbed divalent iron, which promotes iron absorption. In addition, guanidine groups such as ferrous iron complexases can also be made active in order to function effectively. Therefore, vitamin C is an important auxiliary drug for the treatment of anemia.
3, promote the formation of tetrahydrofolate. Vitamin C can promote the reduction of folic acid to play a role in tetrahydrofolate, it also has a certain effect on megaloblastic anemia.
4. Maintain the activity of the sulfhydryl enzyme.
Third, other functions
1, detoxification. After adding a large amount of vitamin C ^ in the body, it can alleviate the toxic effects of lead, mercury, cadmium, arsenic and other heavy metals on the body.
2, to prevent cancer. Many studies have shown that vitamin B can block the synthesis of carcinogen N-nitroso compounds and prevent cancer.
3, Scavenging Free Radicals Vitamin C can be converted into semi-deoxy ascorbic acid and dehydroascorbic acid by step-by-step supplying electrons to remove free radicals such as super-negative oxygen ions, hydroxyl radicals, organic radicals, and organic peroxide radicals; Phenol free radicals are re-reduced to tocopherols. The ascorbic acid free radicals produced by the reaction can be reduced to ascorbic acid by NADH2 system enzymes under certain conditions.