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Tannins are usually divided into hydrolyzable tannins and condensed tannins (proanthocyanidins).

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Got Tannins?

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Got Tannins? Blog :: Got Tannins?

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Tannins - MSN Encarta

Tannins, also tannic acid, common name applied to a group of vegetable products, both amorphous and ... Blog It. How to cite this article: "Tannins, ...encarta.msn.com/encyclopedia_761576643/Tannins.html

Tannins — Blogs, Pictures, and more on WordPress

Education Series - What are Tannins? — 2 comments ... Tags: Wine Education, tannin, education series. Have your say. Start a blog. ...wordpress.com/tag/tannins/

Tannins are oh-so-tacky | Just Grapes Wine Blog

My friend, a diehard white wine drinker, discovered for the first time that ... Tannins in wine come from the grapes' leaves, stems and skin and sometimes the ...blog.justgrapes.net/wine-education/tannins-are-oh-so-tacky

Wikipedia About Tannins

Bottle%20of%20tannic%20acid.jpg

Tannins are usually divided into hydrolyzable tannins and condensed tannins (proanthocyanidins).

Occurrence

Tannins are distributed all over the plant kingdom. They are commonly found in both gymnosperms as well as angiosperms. In terms of location of the tannins in a plant, they are mainly located in the vacuoles or surface wax of the plants. These sites are where tannins do not interfere with plant metabolism, and it is only after cell breakdown and death that the tannins are active in metabolic effects. Tannins are found in leaf tissues, bud tissues, seed tissues, root tissues and stem tissues. An example of the location of the tannins in the stem tissue is that they are often found in the growth areas of trees, such as the secondary phloem and xylem and the layer between the cortex and epidermis. Tannins may help regulate the growth of these tissues. They are also found in the heartwood of conifers and may play a role in inhibiting microbial activity, thus resulting in the natural durability of the wood. However, there may be a loss in the bioavailability of tannins in plants due to birds, pests, and other pathogens.

The leaching of tannins from the decaying leaves of vegetation adjoining a stream may produce what is known as a blackwater river.

Hydrolysable tannins

At the center of a hydrolysable tannin molecule, there is a carbohydrate (usually D-glucose). The hydroxyl groups of the carbohydrate are partially or totally esterified with phenolic groups such as gallic acid (in gallotannins) or ellagic acid (in ellagitannins). Hydrolyzable tannins are hydrolyzed by weak acids or weak bases to produce carbohydrate and phenolic acids.

Examples of gallotannins are the gallic acid esters of glucose in tannic acid (C76H52O46), found in the leaves and bark of many plant species.

Condensed tannins

Condensed tannins, also known as proanthocyanidins, are polymers of 2 to 50 (or more) flavonoid units that are joined by carbon-carbon bonds, which are not susceptible to being cleaved by hydrolysis. While hydrolyzable tannins and most condensed tannins are water soluble, some very large condensed tannins are insoluble.

Tea

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Wine

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Modern winemakers take great care to minimize undesirable tannins from seeds by crushing grapes gently when extracting their juice, to avoid crushing the seeds. Pressing the grapes further results in press wine which is more tannic and might be kept separately. De-stemming is also widely practiced. Wines can also take on tannins if matured in oak or wood casks with a high tannin content. Tannins play an important role in preventing oxidation in aging wine and appear to polymerize and make up a major portion of the sediment in wine.

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tannin: Definition from Answers.com

tannin n. Tannic acid. Any of various chemically different substances ... 4.2.1 Effects of tannins on the drinkability and aging potential of wine. 4.3 Fruits ...www.answers.com/topic/tannin

TAMING THE TANNINS / New techniques in the vineyard and the winery are ...

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Tannins.

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Tannins in wine

Tannins in wine: a lengthy discussion ... Tannins ... Why is the subject of tannins an important one for the wine trade at large, and ...www.wineanorak.com/tannins.htm

Tannins, Wine, and Migraine Headaches

Tannins, Wine, and Migraine Headaches - learn more about how tannins can cause headaches. ... Tannins - plant polyphenols - are an integral part of creating a ...www.wineintro.com/glossary/t/tannins.html

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NZ scientists sound warning on ocean acidification

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Wine and Spirits / French connection

Haaretz DailyAs artisanal wineries continue to open on a regular basis, new boutique wine importers also continue to appear on the local scene.http://www.haaretz.com/hasen/spages/1085204.html

Vail Valley wine and beer reviews

Vail DailyDel Norte Brewing Co.'s Orale Lager is refreshing and perfect for summer; Vale do Bomfin is a dry red remiscent of port; Francis Coppola Sofia Sparkling Blanc would make for an elegant wedding sipperhttp://www.vaildaily.com/article/20090512/AE/905129977/1066/...

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Otis Kenyon wines are big and beautiful

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Weather Eye: autumn starts to reach across Britain

Times OnlineThe yellows and oranges come from carotenoid pigments which are present in carrots and buttercups; tannins give the brown tones, and are best known for giving tea its colour. The most dramatic, blushing red leaf displays need a particular sort of ... http://www.timesonline.co.uk/tol/news/weather/article4924157...

Why Argentine Malbec shines above the rest

Financial TimesMalbec also, usefully, matures in the bottle much faster than Cabernet Sauvignon – being much lower in tough tannins, even though it is much higher in colouring matter. In the old days Argentine Malbec was typically made in the image of Bordeaux ... http://www.ft.com/cms/s/0/48aaa044-9662-11dd-9dce-000077b076...

Wine of the Week

Scranton TimesRed Rock Winery 2006 California Reserve Merlot has nice color and a light body. Fresh red raspberry flavors with puckering tannins in back. Probably could benefit from some decanting. The finish fades fairly fast. A special order wine in Pennsylvania ... http://www.scrantontimes.com/articles/2008/10/12/lifestyles/...

Wine: Young barberas delightful

Daily News JournalMade from one of the two most widely planted grapes in Italy — and fifth in California — barbera wines can have vibrant flavors, fresh acidity and soft tannins making it very easy to drink, with or without food. When young, they can have intense ... http://www.dnj.com/apps/pbcs.dll/article?AID=/20081008/LIFES...

Wine, etc.: Grenache does well on its own

HometownAnnapolis.comFine tannins, sweet cassis notes and rich mouthfeel and fine but plentiful tannins. Using grapes from Santa Ynez, this blockbuster will age for a decade. Quivira Dry Creek Valley Grenache 2006 ($26). We have admired the wines of Quivira for years, but ... http://www.hometownannapolis.com/cgi-bin/read/2008/10_08-47/...

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What are tannins?

What are tannins? ... What are Tannins? I drink Rooibos tea, which is an herbal tea made in South Africa — it is caffeine-free.http://www.ochef.com/197.htm

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Tannins definition of Tannins in the Free Online Encyclopedia.

tannin, tannic acid, or gallotannic acid, astringent vegetable product found in a wide variety of plants. Sources include the bark of oak, hemlock, chestnut, and mangrove; the ... http://encyclopedia2.thefreedictionary.com/Tannins

Tannins - definition of Tannins by the Free Online Dictionary ...

tan·nin   (t n n) n. 1. Tannic acid. 2. Any of various chemically different substances capable of promoting tanning. [French, from tan, crushed oak bark, from Old French, from ... http://www.thefreedictionary.com/Tannins

tannins - definition of tannins in the Medical dictionary - by the ...

tannins, n.pl polyphenolic phytochemicals whose name derives from their use in tanning animal skins. Used as astringents, antioxidants, and styptics; treats burns, relieves ... http://medical-dictionary.thefreedictionary.com/tannins
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Female red colobus chewing earth on...

Female red colobus chewing earth on termite mound, possibly to detoxify leaf tanninsFemale red colobus chewing earth on termite mound, possibly to detoxify leaf tanninsQuickTime - Video

5 Tannins

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Wine Making at Crushpad: Adding Enz...

Wine Making at Crushpad: Adding Enzymes or TanninsYou can make an addition of enzymes to a fermentation to more gently extract color or add a small amount of tannin to give your wine that small bit of added structure that brings...Flash - Video

What is the difference between hard...

What is the difference between hard tannins and soft tannins? (What is the difference between hard t...Wine ConceptsFlash - Video

Wine Making at Crushpad: Adding Enz...

Wine Making at Crushpad: Adding Enzymes or TanninsYou can make an addition of enzymes to a fermentation to more gently extract color or add a small amount of tannin to give your wine that small bit of added structure that brings...Flash - Video

Answers for Tannins

Tmann2994how long does it take to get tannins out of driftwood?Tmann2994That depends on several things... Certain types of wood have more tannins than other-- Malaysian and American woods tend to take MUCH longer than African hardwoods to leach their tannins out. Also, ...NechinwaWhat is the connection between TANNINS and HYDROCHLORIC acid?NechinwaMany naturally occurring plant extracts such as guava leaf extract have colourants that are pH sensitive. They have different colours depending on whether thay are in acidic or basic solutions. Your g...acehow could saponins and tannins and alkaloids be harmful to organisms?aceSaponins and tannins both lower the surface tension and would cause organisms to lyse or break up. Most alkaloids have some degree of toxicity which damages organisms. The saponins and tannins would...conebone69How effective is driftwood in lowering pH, if there are no tannins present?conebone69Driftwood lowers the pH in two ways: tannins, and gradual decomposition. The tannins soften the water, while the wood slowly decomposes, producing carbonic acid. The tannins stain the water and soft...quirkyWhich red wines have the fewest tannins. I think I may be sensitive to tannins.?quirkyRed wines contain a large number of compounds which originate from the skins and seeds of the grapes, including tannins, but also including antioxidants and complex aromatic molecules. These contribu...
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