班门弄斧的科普贴 - 抗氧化剂

坛子里不少教授专家在，俺们就抛砖引玉吧

反正我是经常吃点抗氧化剂的，就算没法长生不老，也得争取活得健康点不是吗？
 

An antioxidant is a molecule that inhibits the oxidation of other molecules. Oxidation is a chemical reaction that transfers electrons or hydrogen from a substance to an oxidizing agent. Oxidation reactions can produce free radicals. In turn, these radicals can start chain reactions. When the chain reaction occurs in a cell, it can cause damage or death to the cell. Antioxidants terminate these chain reactions by removing free radical intermediates, and inhibit other oxidation reactions. They do this by being oxidized themselves, so antioxidants are often reducing agents such as thiols, ascorbic acid, or polyphenols.^[1]

 

Although oxidation reactions are crucial for life, they can also be damaging; plants and animals maintain complex systems of multiple types of antioxidants, such as glutathione, vitamin C, vitamin A, and vitamin E as well as enzymes such as catalase, superoxide dismutase and various peroxidases. Insufficient levels of antioxidants, or inhibition of the antioxidant enzymes, cause oxidative stress and may damage or kill cells. Oxidative stress is damage to cell structure and cell function by overly reactive oxygen-containing molecules and chronic excessive inflammation. Oxidative stress seems to play a significant role in many human diseases, including cancers. The use of antioxidants in pharmacology is intensively studied, particularly as treatments for stroke and neurodegenerative diseases. For these reasons, oxidative stress can be considered to be both the cause and the consequence of some diseases.

Antioxidants are widely used in dietary supplements and have been investigated for the prevention of diseases such as cancer, coronary heart disease and even altitude sickness. Although initial studies suggested that antioxidant supplements might promote health, later large clinical trials with a limited number of antioxidants detected no benefit and even suggested that excess supplementation with certain putative antioxidants may be harmful.^[2][3][4] Antioxidants also have many industrial uses, such as preservatives in food and cosmetics and to prevent the degradation of rubber and gasoline.^[5]

 

 

所有跟帖： 

• 不得不夸一下阿司匹林（ascorbic acid）， 小兵立大功。效果好， 最便宜。 -大百百- ♂ (0 bytes) () 09/26/2014 postreply 23:23:44

• ascorbic acid 是抗坏血酸，维生素C。阿司匹林是asprin。二者不相干 -山高路远- ♂ (0 bytes) () 09/27/2014 postreply 02:23:47

• 不好意思，张冠李戴。 阿司匹林的化学名是 acetylsalicylic acid。 TF 昏了头啊。 -大百百- ♂ (0 bytes) () 09/27/2014 postreply 09:21:23

• 觉得“清心寡欲”，生活规律是不错的“防腐剂”。看昂山素姬刚恢复自由的时候多年轻的样子 -818nr- ♀ (131 bytes) () 09/27/2014 postreply 00:10:05

• 还是食补好。挑颜色鲜艳的水果蔬菜类。 -Morning3evening4- ♂ (218 bytes) () 09/27/2014 postreply 07:26:11

• 我也在吃抗氧化剂，这种玄乎的东东，可能就是安慰一下心情而已。 -怀着我的梦想- ♀ (0 bytes) () 09/27/2014 postreply 10:22:49