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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.&lt;br /&gt;
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[[Image:Foods highest in antioxidants.jpg|thumb|300px|right|Foods highest in antioxidants]]&lt;br /&gt;
=== Antioxidants as preservatives===&lt;br /&gt;
Food preservatives&lt;br /&gt;
Antioxidants are used as food additives to help guard against food deterioration. Exposure to oxygen and sunlight are the two main factors in the oxidation of food, so food is preserved by keeping in the dark and sealing it in containers or even coating it in wax, as with [[cucumbers]]. However, as oxygen is also important for plant respiration, storing plant materials in anaerobic conditions produces unpleasant flavours and unappealing colours. Consequently, packaging of fresh fruits and vegetables contains an ~8% oxygen atmosphere. Antioxidants are an especially important class of preservatives as, unlike bacterial or fungal spoilage, oxidation reactions still occur relatively rapidly in frozen or refrigerated food.&lt;br /&gt;
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==See also==&lt;br /&gt;
This is a complex subject and detailed information is outside the scope of this wiki.  See below for more information on this subject.&lt;br /&gt;
* http://en.wikipedia.org/wiki/List_of_antioxidants_in_food&lt;br /&gt;
* http://en.wikipedia.org/wiki/Antioxidant&lt;br /&gt;
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		<author><name>Chef</name></author>
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