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Topic: Tannin


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  Bark Tanning: Tannins and Tannin Sources
Tannins occur in nearly every plant from all over the world, in all climates.
Tannin is usually concentrated in the inner bark (cambium layer).
Tannin is water soluble and will be leached out of wood or bark that has been left out in the rain.
www.braintan.com /barktan/2tannins.htm   (1084 words)

  
  Tannin - LoveToKnow 1911   (Site not responding. Last check: 2007-10-14)
Common tannin, or tannic acid, C, 4 H, 0 0 9.2H 2 O, occurs to the extent of 50% in gall-nuts, and also in tea, sumach and in other plants.
It may be obtained by extracting powdered gall-nuts with a mixture of ether and alcohol, whereupon the tannin is taken up in the lower layer, which on separation and evaporation yields the acid.
The tannin of oak, C/9H16010, which is found, mixed with gallic acid, ellagic acid and quercite, in oak bark, is a red powder; its aqueous solution is coloured dark blue by ferric chloride, and boiling with dilute sulphuric acid gives oak red or phlobaphene.
www.1911encyclopedia.org /Tannin   (690 words)

  
 Highbeam Encyclopedia - Search Results for tannin
Tannin is used in tanning to cure hides and make leather, in inks and dyes, and as an astringent in medicine.
tannins Compounds present in dark-coloured sorghum, carob bean, unripe fruits, tea, etc.; they have an astringent effect in the mouth, precipitate proteins, and are used to clarify beer and wines.
Condensed tannin concentration of rhizomatous and nonrhizomatous birdsfoot trefoil in grazed mixtures and monocultures.
www.encyclopedia.com /SearchResults.aspx?Q=tannin   (672 words)

  
 Tannin Chemistry
Click on the title to obtain a pdf file containing information on the plant secondary metabolites known as tannins.
The Hagerman laboratory methods originally in the "Tannin Handbook" are all incorporated in this pdf file, linked to information about tannin structural chemistry, methods of purification, biological activities and biosynthesis.
This material may be copied for use within a single laboratory but cannot be copied for distribution or publication without permission of the author.
www.users.muohio.edu /hagermae   (94 words)

  
 Etherington & Roberts. Dictionary--vegetable tannins
Tannins are complex organic materials, and frequently have very large molecules and high molecular weights, on the order of 2,000 or greater, although it is still not certain whether they might better be considered macro-molecular substances.
Tannins were at one time classed with the glucosides because of the sugar groups that most of them contain but they are now more often regarded as constituting a class by themselves, as some, e.g., the hemlock tannins, do not have the sugar group in the molecule.
Although tannins occur throughout the greater part of the vegetable kingdom, they are more prevalent among the Angiosperms, or higher plants, especially in certain Dicotyledon families, than they are among the lower types, such as fungi, algae, etc. The Gymnosperms also have classes in which tanning is well developed, e.g., the pines, spruces and hemlocks.
palimpsest.stanford.edu /don/dt/dt3686.html   (959 words)

  
 ARS | Publication request: Tannin-Containing Alfalfa: a Way to Improve Nitrogen-Use and Profitability of Dairy Farms?   (Site not responding. Last check: 2007-10-14)
Tannins were also presumed to reduce the nitrogen mineralization rate of alfalfa residues in soil by 30%.
Tannins increased the value of alfalfa silage by $24 to $32 and alfalfa hay by $12 per ton of dry matter.
We are conducting cropping and feeding studies with birdsfoot trefoil (containing 1 to 4% tannin) and alfalfa to identify optimal forage tannin concentrations and management practices for improving protein and nitrogen use on dairy farms.
www.ars.usda.gov /research/publications/publications.htm?seq_no_115=134825   (506 words)

  
 TWPT Talks with Tannin Schwartzstein and Raven Kaldera
Tannin has studied diverse practices and paths such as Gi Gong, Shamanistic energy techniques, Gnostisism, Afro-Caribbean religions, and even a pinch of Ceremonial Magick.
Unlike Tannin, who will always be a city person and who loves it, I finally fled the city, and now I live rurally on a farm.
Tannin, you also operate a brick and mortar store, what made you decide to open the store in the first place and does it limit the amount of time that you can spend out on the road?
www.twpt.com /schwartzsteinkaldera.htm   (5292 words)

  
 Tannin (demon)   (Site not responding. Last check: 2007-10-14)
In Jewish folklore Tannin is the name of a demon associated either with a dragon or a serpent.
It is unclear in Jewish literature the differentiation between Tannin, Rahab and Leviathan, but Tannin and Rahab are more easily confused one with the other.
Tannin, as well as Rahab, was a name applied to Egypt after the exodus of the Israelites from that country.
www.xasa.com /wiki/en/wikipedia/t/ta/tannin__demon_.html   (117 words)

  
 Applications - Specialty: Tannin Removal   (Site not responding. Last check: 2007-10-14)
Tannins are organic matter sometimes found in water that give the water a light yellow to a dark tea color.
Since the Tannin removing anion resin is lighter in specific gravity, adjustment must be made to the backwash flow rate for the mixed bed.
Tannin removing resins can also be used in a separate vessel when water quantity requirements demand.
www.puroliteusa.com /tanninremoval.htm   (345 words)

  
 Wine Business - Winemaking
These roles for tannin in the sensory quality of wine justify the avid interest of winemakers in developing a method to measure grape tannin content during growth and wine manufacture, as well as provide a tool to investigate cause and effect relationships throughout the winemaking process.
Tannin bioassay by a protein precipitation technique serves best to both quantify tannin, and assess its biological activity when both the precipitate (the insoluble tannin bound protein) and the supernatant (the soluble tannin bound protein) are used for tannin assessment.
The amount of BSA precipitated by tannins in the sample is determined as the difference between the amount of BSA (1.39mg) added to the reaction mixture minus the BSA left in the sample (unbound BSA detected in the supernatant).
www.winebusiness.com /Winemaking/webarticle.cfm?dataId=42354   (3602 words)

  
 MBAA TQ - The stabilization of beer through tannin addition.   (Site not responding. Last check: 2007-10-14)
Oxidized tannins cause precipitation of beer haze and after tannin treatment access of air to the beer must be avoided.
The correct tannin dosage for beer was estimated by adding 0 to 10 g/hl and either measuring residual complex N with picric acid or by Lundin analysis or by testing for excess tannin in the treated beer with iron at pH 10.
Tannin should be added when beer is transferred to storage tanks and the further addition of proteolytic enzyme made after filtration.
www.mbaa.com /TechQuarterly/Abstracts/1970/tq70ab22.htm   (150 words)

  
 AllRefer.com - tannin (Organic Chemistry) - Encyclopedia
Tannin is also present in tea, coffee, and walnuts.
Tannin is used in tanning animal skins to make leather; it transforms certain proteins of animal tissue into compounds that resist decomposition.
It is also used in manufacturing inks, as a mordant in dyeing, and in medicine as an astringent and for treatment of burns.
reference.allrefer.com /encyclopedia/T/tannin-t.html   (254 words)

  
 Tannins
Tannins act as a defense mechanism in plants against pathogens, herbivores and hostile environmental conditions.
Indeed, drying reduces the solubility of tannins and, hence, reduces their ability to complex proteins (tannins become more polimerized, resulting in a lower number of free hydroxyls available for binding the proteins).
If protein digestibility is not affected by tannins, proteins behave as a uniform fraction, with a regression coefficient (true digestibility) equal to or larger than 0.88, with a negative intercept(estimate of metabolic endogenous nitrogen, usually about 0.5% of dry matter intake or smaller) and with a low standard error.
www.ansci.cornell.edu /plants/toxicagents/tannin/toxic_effects.html   (1481 words)

  
 Tree foliage in ruminant nutrition
Tannin content, therefore, potentially alter the use and value of tree foliages and may at times be responsible for the poor utilization of such forages by ruminant livestock.
Subsequent studies implicated tannin in the death of the animals and this led to a study of tannin in the tree foliage.
Condensed tannin under acid or alkaline conditions of the intestines may be split to sugars and organic acids, mostly gallic acids, releasing protein and amino acids that are digestible in the lower gut.
www.fao.org /docrep/003/w7448e/W7448E04.htm   (7393 words)

  
 212. Tannin (food grade) (FAO Nutrition Meetings Report Series 48a)
TANNIN (FOOD GRADE) Tannic acid was considered at the Tenth Meeting of the Joint FAO/WHO Expert Committee on Food Additives but no ADI could be established because of insufficient data (FAO/WHO, 1967).
Chewing gum containing the tannin at a level of 0.5% was the material actually incorporated into the diet, No ill effects were noted at any level of tannin fed as judged by behaviour, food consumption, haematology, organ function tests, organ weights and gross and microscopic pathology (Rosner-Hixon Lab., 1965).
Their relevance to the assessment of food grade tannin is small because the presence of commercial tannins is excluded by the specification for food grade material.
www.inchem.org /documents/jecfa/jecmono/v48aje14.htm   (824 words)

  
 Foods Containing Tannin May Trigger Migraine
WESTPORT (Reuters) -- Tannin appears to be one of the substances that can trigger migraine, a Canadian physician reports in the September issue of the journal Headache.
Both patients were adult women, one with frequent migraine, the other with "almost continuous migraines for most of her life." The first patient reported the onset of a migraine shortly after she consumed two glasses of cloudy apple juice.
After she began the diet, the woman did not have a migraine attack for 10 days, and the overall frequency of migraine was reduced to once a month.
www.personalmd.com /news/a1997111005.shtml   (244 words)

  
 Tannin Produced from Pine Bark in Chile: International Development Research Centre
Tests demonstrated that the pine tannin rust converter works better than commercial converters and is as effective as sandblasting, the most common but expensive method for cleaning steel surfaces before painting.
Rust inhibitor - tannin is addedto mineral oil to protect cold-rolled steel from corrosion during transportation and storage; to date, only preliminary research has been undertaken on this application.
It was hoped that research into tannin produced from Chilean pine bark would reduce the need to import tannin to treat leather.
www.idrc.ca /en/ev-3180-201-1-DO_TOPIC.html   (893 words)

  
 tannin2   (Site not responding. Last check: 2007-10-14)
Tannin is a loose term for a whole collection of non-volatile phenolic substances found in apples, grapes and many other fruits, and which provide 'body' to fermented beverages.
This expresses the tannin in arbitrary percentage units (originally of purified 'tannic acid' which is a polygalloyl glucose obtained from oak galls).
Although tannin is subject to oxidation and loss if the apple pulp is greatly exposed to air between milling and pressing, the practical losses between fruit extracted with no oxidation (sulphite during milling) and with normal oxidation during handling amount to no more than around 20% (reference)
ourworld.compuserve.com /homepages/andrew_lea/tannin.htm   (1255 words)

  
 Tannin and Organic Removal Systems   (Site not responding. Last check: 2007-10-14)
Tannins are dissolved, decayed organic matter in the water, and generally not a health risk.
Tannins can also prevent iron from precipitating, and tannins in water are responsible for many failures of iron removal filter systems.
Many mild cases of tannin contamination (light to no color) can be treated with as little as 1/3 of a foot of tannin resin.
www.swtwater.com /catalog/1200_tannin_organic_systems.htm   (727 words)

  
 Tannins - herbs 2000.com
The traditional application of tannin remedies for controlling diarrhea is an example of this: in rural circumstances most diarrhea (and this symptom is the main proximal cause of death in most of the world) is caused by inflammation or irritation in the small intestine - enteritis.
Clearly the uses of tannins may be limited in such cases: however, as long as there is some local irritation involved, there is the chance that tannins will reduce the intensity of the reflex intestinal hurry.
Tannins are like mucilages in that they work as astringents only at point of contact, on the surface or on the gut wall.
www.herbs2000.com /h_menu/tannins.htm   (1314 words)

  
 Basic Juice: Tannin Taxonomy
Wizard’s standpoint, tannins are a class of molecules that interact with proteins, and by so doing, increase their molecular size (there's an Enzyte joke in there somewhere..).
Tannins are present in grape seeds, stems and skin.
Tannins, treated the right way (although according to Jancis's Oxford Wine Companion, the exact mechanisms are still poorly understood), allow wine to age gracefully (think wine tanning).
basicjuice.blogs.com /basicjuice/2005/12/tannin_taxonomy.html   (454 words)

  
 Tannin - PressedForWine.com   (Site not responding. Last check: 2007-10-14)
Tannins give wine the extra character or 'spunk' that it may otherwise be lacking.
The amount, or extent in which the tannins may cause astringency is a strong function of the polymerization of the tannin molecule.
But, once the tannin molecules reach a high degree of polymerization, they actually begin to lose the capability to combine with the proteins in saliva--so the astringency associated with the tannin will be decreased, while the favorable characteristic of the tannin will be maintained.
www.pressedforwine.com /ingredients/tannin.shtml   (306 words)

  
 The Exploratorium: The Science of Wine: Tannin Eraser
The Australian Cabernet is higher in tannins, compounds whose concentration varies from grape to grape.
Tannins are also present in wine stems and seeds and in the barrels used to age wines.
Tannins are considered desirable in wines that are meant to be aged; over time, the tannins soften and add to the complexity of a well-aged red wine.
www.exploratorium.edu /wine/tannin_activity.html   (277 words)

  
 Wine Whys: Totally Tannin   (Site not responding. Last check: 2007-10-14)
As Sharon mentioned in a previous post, tannin is felt in your gums as a dry and sometimes rough sensation.
These tannins are often a little bit less pleasant, which is why there is less use of pips and stems during fermentation.
» From the Vine: Tannins 101 from LENNDEVOURS
wine.blogs.com /winewhys/2004/09/totally_tannin.html   (659 words)

  
 Painting Problem Solver by Sherwin-Williams | Tannin Staining
Brownish or tan discoloration on the paint surface due to migration of tannins from the substrate (e.g., the surface that was painted) through the paint film.
Tannin staining can occur with any kind of wood.
Check to be sure the water has not affected the adhesion of the coating (e.g., primer, paint or stain).
www.sherwin-williams.com /do_it_yourself/painting_techniques/painting_problem_solver/problems/TanninStaining.jsp   (256 words)

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