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Tannins: Tannin

Tannins: Tannin


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About the Book

Chapters: Tannin. Source: Wikipedia. Pages: 72. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Tannins are astringent, bitter plant polyphenols that either bind and precipitate or shrink proteins and various other organic compounds including amino acids and alkaloids. The astringency from the tannins is what causes the dry and puckery feeling in the mouth following the consumption of unripened fruit or red wine. Likewise, the destruction or modification of tannins with time plays an important role in the ripening of fruit and the aging of wine. The term tannin (from tanna, an Old High German word for oak or for tree) refers to the use of wood tannins from oak in tanning animal hides into leather; however, the term is widely applied to any large polyphenolic compound containing sufficient hydroxyls and other suitable groups (such as carboxyls) to form strong complexes with proteins and other macromolecules. The compounds are widely distributed in many species of plants, where they play a role in protection from predation and perhaps also in growth regulation. Tannins have molecular weights ranging from 500 to over 3,000. Tannins are incompatible with alkalis, gelatin, heavy metals, iron, lime water, metallic salts, strong oxidizing agents and zinc sulfate, since they form complexes and precipitate in aqueous solution. Tannins are usually divided into hydrolyzable tannins and condensed tannins (proanthocyanidins): Tannins are distributed in species throughout the plant kingdom. They are commonly found in both gymnosperms as well as angiosperms. Botanically, tannins are mainly physically located in the vacuoles or surface wax of plants. These storage sites keep tannins active against plant predators, but also keep some tannins from affecting plant metabolism while the plant tissue is alive; i...More: http: //booksllc.net/?id=6198


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Product Details
  • ISBN-13: 9781156734131
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Tannin
  • Width: 229 mm
  • ISBN-10: 1156734134
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Spine Width: 5 mm
  • Weight: 122 gr


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