Talk:Tannin
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This is the talk page for the chemical tannin. For the user Tannin, see User Talk:Tannin
Tea?
A local tea manufacturer (Douwe Egberts) claims on their web sites that tea does NOT contain tannin (looizuur), but related chemicals, flavonoids (lit. from Dutch), which are polyfenols (again, lit. from Dutch). See http://www.pickwick.nl/faq/faq_rechts.asp?VraagID=16 (Dutch).
- Tannin is a polyphenol, if that helps.
Can anyone confirm or deny this? branko
- "Tannin" is very broad term, as I understand it. It's used to refer to a whole stack of related organic chemicals, and rather poorly defined. Many of them appear in bark rather than in leaves. I looked this stuff up a while ago, and have forgotten the details, alas. I guess I have a pretty good reason to refresh my memory and update the entry accordingly. :) Tannin
Sediment
Is the sediment bit right? I thought the sediment was mostly salts of tartaric acid, as investigated by Louis Pasteur
- Pretty sure about it. Having trouble finding a good cite of an overview of wine chemistry, but basically the anthocyanins (pigment molecules) and tannins polymerize very slowly and gradually get so big they fall out of solution, leaving a less red and less tannic wine. [1] (http://www.fst.vt.edu/Zoecklein/Mayjune00.html) talks about the process during fermentation, but doesn't really discuss aging. Tartaric acid is what makes sediment gritty, and is also a major contributor. Wnissen 19:30 6 Jun 2003 (UTC)
Article name
If no one objects, I would like to move this page to Tannin, since most of the incoming pages link to there. — Pekinensis 14:58, 12 May 2005 (UTC)
Done. — Pekinensis 14:40, 15 May 2005 (UTC)