1, vitamin C?
Vitamin C has many antioxidant properties, and the redox effect inside and outside the cell is inseparable from it. It can eliminate the toxicity of pollutants (such as ozone and nitrogen dioxide gas) in the respiratory tract, and can react with oxygen free radicals, hydrogen peroxide and hydroxyl ions produced in the body as a reducing agent. Among melons and fruits, fresh dates, red fruits, oranges, strawberries, grapefruit and lemons are the most abundant. Vegetables rich in vitamin C include cauliflower, spinach, amaranth, shepherd's purse, lettuce leaves, Chinese cabbage and so on. Every100g contains about 30mg of vitamin C. ?
2. vitamin e?
Peroxide group is the intermediate of chain reaction for scavenging cell membrane and lipoprotein surface, and it is one of the most important free radical scavengers. Foods rich in vitamin E include sesame, peanuts, soybeans and bean products, walnuts, sunflower seeds, sweet potatoes and tomatoes.
3. Trace element selenium?
Selenium is the most important trace element to prolong life, which has the characteristics of strong oxidation resistance and scavenging free radicals. Glutathione containing selenium is also an antioxidant, which is called "longevity factor". Its main function is to transport oxygen for normal cells to breathe, while preventing malignant tumor cells from supplying oxygen. Glutathione is abundant in corn, Chinese cabbage, garlic and tomatoes, which is why eating yellow corn prevents cancer.
Foods rich in selenium include asparagus, onions, mushrooms, garlic, eggs, tuna and animal livers. Chicken liver, Monopterus albus, herring, hairtail and other meats contain more than 30 mg of selenium per100g.
4. Flavonoids and lycopene?
This is a new family of antioxidants, which are very effective in scavenging free radicals, especially oxygen free radicals. It can inhibit the oxidation of low density lipoprotein and has anti-atherosclerosis effect. Flavonoids can also inhibit platelet aggregation, reduce blood viscosity and reduce vascular embolism. Fruits and vegetables containing flavonoids include hawthorn, tomato, persimmon, onion, apple, eggplant, red pepper, kelp, laver, pumpkin, cherry, red grape, purple grape, strawberry, mango, citrus, apricot, pomegranate, peach and monkey peach.
5. β -carotene β -carotene mainly treats unbound oxygen, which can prevent malignant tumor cells from supplying oxygen. Vegetables and fruits rich in β -carotene include carrots, spinach, pumpkins, tomatoes, potatoes, apples and so on. In kale, shepherd's purse, celery (leaves), amaranth, Chinese cabbage, leek and other vegetables, it can contain more than 1 000 mg per 100 grams. In addition, sweet potatoes and yellow fruits such as apricots and persimmons are also rich.
6. Superoxide dismutase (SOD) mainly removes hydrogen peroxide free radicals. There are celery, leeks, cucumbers, tomatoes, red beans, green beans, potatoes, green leafy vegetables and algae rich in superoxide dismutase. ?
7. Other antioxidants containing polyphenols are also "hunters" who capture free radicals and resist low-density lipoprotein, which can maintain the normal elasticity of blood vessels and prevent atherosclerotic plaques from depositing on blood vessel walls. This kind of food includes red grapes and red wine, green tea, apples and so on. According to research, garlic contains 15 kinds of antioxidants and trace element selenium. Eating garlic often is beneficial to the elimination of free radicals in the body.
Extended data:
Free radicals, also known as "free radicals" in chemistry, refer to atoms or groups with unpaired electrons formed by the breaking of valence bonds of compounds under external conditions such as light and heat. (When the valence bond of * * * is unevenly cracked, the * * between two atoms is completely transferred to one of them by electron pairs, forming positively charged and negatively charged ions, which is called bond hetero-cracking. ) when writing, generally add a ""next to the atomic symbol or the atomic group symbol, indicating that there are no paired electrons.
Such as hydrogen group (H, namely hydrogen atom), chlorine group (Cl, namely chlorine atom) and methyl group (CH3). Free radical reaction plays an important role in combustion, gas chemistry, polymerization, plasma chemistry, biochemistry and other chemical disciplines. The first radical discovered and confirmed in history is triphenylmethyl radical discovered by Moses Gomberg at the University of Michigan in 1900. Academician Liu Youcheng, an organic chemist from China, has also made outstanding contributions in the field of free radical chemistry.
References:
Baidu encyclopedia-free radical