Antioxidant | Wikipedia audio article
Channel: wikipedia tts
Date: 27/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Antioxidant


00:01:24 1 Health effects
00:01:33 1.1 Relation to diet
00:02:44 1.2 Drug candidates
00:03:24 1.3 Adverse effects
00:05:43 2 Oxidative challenge in biology
00:09:02 3 Examples of bioactive antioxidant compounds
00:11:08 3.1 Uric acid
00:13:12 3.2 Vitamin C
00:14:35 3.3 Glutathione
00:15:47 3.4 Vitamin E
00:17:37 4 Pro-oxidant activities
00:19:29 5 Enzyme systems
00:20:24 5.1 Superoxide dismutase, catalase, and peroxiredoxins
00:23:35 5.2 Thioredoxin and glutathione systems
00:25:41 6 Oxidative stress in disease
00:27:31 7 Uses in technology
00:27:40 7.1 Food preservatives
00:30:01 7.2 Industrial uses
00:32:06 8 Levels in food
00:33:30 8.1 Measurement and invalidation of ORAC
00:34:46 9 History



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SUMMARY
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Antioxidants are compounds that inhibit oxidation. Oxidation is a chemical reaction that can produce free radicals, thereby leading to chain reactions that may damage the cells of organisms. Antioxidants such as thiols or ascorbic acid (vitamin C) terminate these chain reactions. To balance the oxidative stress, plants and animals maintain complex systems of overlapping antioxidants, such as glutathione and enzymes (e.g., catalase and superoxide dismutase), produced internally, or the dietary antioxidants vitamin C, and vitamin E.
The term "antioxidant" is mostly used for two entirely different groups of substances: industrial chemicals that are added to products to prevent oxidation, and naturally occurring compounds that are present in foods and tissue. The former, industrial antioxidants, have diverse uses: acting as preservatives in food and cosmetics, and being oxidation-inhibitors in fuels.Antioxidant dietary supplements have not been shown to improve health in humans, or to be effective at preventing disease. Supplements of beta-carotene, vitamin A, and vitamin E have no positive effect on mortality rate or cancer risk. Additionally, supplementation with selenium or vitamin E do not reduce the risk of cardiovascular disease.