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Condensed Tannins Depolymerization
Condensed tannins (proanthocyanidins, polyflavonoid tannins, catechol-type tannins, pyrocatecollic type tannins, non-hydrolyzable tannins or flavolans) are polymers formed by the condensation of flavans. They do not contain sugar residues. They are called proanthocyanidins as they yield anthocyanidins when depolymerized under oxidative conditions. Different types of condensed tannins exist, such as the procyanidins, propelargonidins, prodelphinidins, profisetinidins, proteracacinidins, proguibourtinidins or prorobinetidins. All of the above are formed from flavan-3-ols, but flavan-3,4-diols, called (leucoanthocyanidin) also form condensed tannin oligomers, e.g. leuco-fisetinidin form profisetinidin, and flavan-4-ols form condensed tannins, e.g. 3',4',5,7-flavan-4-ol form proluteolinidin (luteoforolor). One particular type of condensed tannin, found in grape, are procyanidins, which are polymers of 2 to 50 (or more) catechin units joined by carbon-carbon bonds. These are not ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schematic Condensed Tannins
A schematic, or schematic diagram, is a designed representation of the elements of a system using abstract, graphic symbols rather than realistic pictures. A schematic usually omits all details that are not relevant to the key information the schematic is intended to convey, and may include oversimplified elements in order to make this essential meaning easier to grasp, as well as additional organization of the information. For example, a subway map intended for passengers may represent a subway station with a dot. The dot is not intended to resemble the actual station at all but aims to give the viewer information without unnecessary visual clutter. A schematic diagram of a chemical process uses symbols in place of detailed representations of the vessels, piping, valves, pumps, and other equipment that compose the system, thus emphasizing the functions of the individual elements and the interconnections among them and suppresses their physical details. In an electronic circuit d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catechin
Catechin is a flavan-3-ol, a type of secondary metabolite providing antioxidant roles in plants. It belongs to the subgroup of polyphenols called flavonoids. The name of the catechin chemical family derives from ''catechu'', which is the tannic juice or boiled extract of ''Mimosa catechu'' (''Acacia catechu'' L.f). Chemistry Catechin possesses two benzene ring Benzene is an organic chemical compound with the molecular formula C6H6. The benzene molecule is composed of six carbon atoms joined in a planar ring with one hydrogen atom attached to each. Because it contains only carbon and hydrogen atom ...s (called the A- and B-rings) and a dihydropyran heterocycle (the C-ring) with a hydroxyl group on carbon 3. The A-ring is similar to a resorcinol moiety while the B-ring is similar to a catechol moiety. There are two chirality (chemistry), chiral centers on the molecule on carbons 2 and 3. Therefore, it has four diastereoisomers. Two of the isomers are in trans configura ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vitis Vinifera
''Vitis vinifera'', the common grape vine, is a species of flowering plant, native to the Mediterranean region, Central Europe, and southwestern Asia, from Morocco and Portugal north to southern Germany and east to northern Iran. There are currently between 5,000 and 10,000 varieties of ''Vitis vinifera'' grapes though only a few are of commercial significance for wine and table grape production. The wild grape is often classified as ''Vitis vinifera'' ''sylvestris'' (in some classifications considered ''Vitis sylvestris''), with ''Vitis vinifera'' ''vinifera'' restricted to cultivated forms. Domesticated vines have hermaphrodite flowers, but ''sylvestris'' is dioecious (male and female flowers on separate plants) and pollination is required for fruit to develop. Grapes can be eaten fresh or dried to produce raisins, sultanas, and currants. Grape leaves are used in the cuisine of many cultures. The fresh grapes can also be processed into juice that is fermented to make wine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grape Seed Extract
Grape seed extract is an industrial derivative of whole grape seeds. The extract contains proanthocyanidins. Grape seed extract quality is measured by the content of procyanidins which are formed from proanthocyanidins. Generally, grape seed extract quality contains 95% procyanidins, but potency varies among products. Eating foods or beverages high in procyanidin results in the sensation of the mouth puckering and dehydration, otherwise known as astringency, as felt after certain alcoholic drinks. Extraction method The properties of grape seed extract depend on the extraction process used to obtain it and how the grapes were grown. The classic method incorporates extraction with organic solvents such as acetone, acetonitrile, ethyl acetate, and methanol. Other methods using hot water have been used, but they are not as effective at maximizing extract production in both quantity and efficiency. High performance liquid chromatography seems to be the most effective analysis along w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acacia Mollissima
''Acacia mearnsii'', commonly known as black wattle, late black wattle or green wattle, is a species of flowering plant in the family Fabaceae and is endemic to south-eastern Australia. It is usually an erect tree with smooth bark, bipinnate leaves and spherical heads of fragrant pale yellow or cream-coloured flowers followed by black to reddish brown pods. In some other parts of the world, it is regarded as an invasive species. Description ''Acacis mearnsii'' is a spreading shrub or erect tree that typically grows to a height of and has smooth bark, sometimes corrugated at the base of old specimens. The leaves are bipinnate with 7 to 31 pairs of pinnae, each with 25 to 78 pairs of pinnules. There is a spherical gland up to below the lowest pair of pinnae. The scented flowers are arranged in spherical heads of twenty to forty and are pale yellow or cream-coloured, the heads on hairy peduncles long. Flowering mainly occurs from October to December and black to reddish-bro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schinopsis Lorentzii
''Schinopsis lorentzii'' is a hardwood tree known as red quebracho, native of the Paraguayan subtropical area, which forms forests in Gran Chaco region of Argentina, in Paraguay, and Bolivia. Some of its common names are ''coronillo'', ''quebracho Cornillo'' (Brazil), ''quebracho chaqueño'', ''quebracho colorado santiagueño'', ''quebracho macho'', and ''quebracho bolí''. The qualification ''colorado'' ("red") differentiates it from other species of common quebracho tree, the ''Aspidosperma quebracho-blanco'' (''quebracho blanco'', "white quebracho", family Apocynaceae). The indication ''santiagueño'' (from Santiago del Estero) is made to distinguish it from ''quebracho colorado chaqueño'', a closely related species (''Schinopsis balansae''). It is considered a symbol of the Gran Chaco region. This tree is commercially very important due to its extremely hard and durable wood, and because of its tannin. The tanning Tanning may refer to: *Tanning (leather), treating animal sk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quebracho Tree
Quebracho is a common name in Spanish to describe very hard (density 0.9–1.3) wood tree species. The etymology of the name derived from ''quiebrahacha'', or ''quebrar hacha'', meaning "axe-breaker". Species There are at least three similar commercially important tree species that grow in the Gran Chaco region of South America. * the quebracho ** ''Schinopsis lorentzii'' (Syn.: ''Schinopsis marginata'' Engl., ''Schinopsis haenkeana'' Engl.); of the family Anacardiaceae; North Argentina, Paraguay and Bolivia; (the red quebracho, quebracho), ''quebracho-colorado santiagueño'', ''red quebracho santiagueño'', ''quebracho santiagueño'' (also known as ''quebracho cor(o)nillo'', ''cor(o)nillo'', ''quebracho macho'', ''quebracho negro'' or ''moro'', ''quebracho rojo'', ''quebracho bolí'', ''horco quebracho'', ''quebracho serrano'', ''quebracho montano'', ''quebracho crespo'', ''quebracho del cerro'', ''quebracho colorado de las sierras'' o ''del cerro'' and ''quebracho cordobés ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plant
Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclude the fungi and some algae, as well as the prokaryotes (the archaea and bacteria). By one definition, plants form the clade Viridiplantae (Latin name for "green plants") which is sister of the Glaucophyta, and consists of the green algae and Embryophyta (land plants). The latter includes the flowering plants, conifers and other gymnosperms, ferns and their allies, hornworts, liverworts, and mosses. Most plants are multicellular organisms. Green plants obtain most of their energy from sunlight via photosynthesis by primary chloroplasts that are derived from endosymbiosis with cyanobacteria. Their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic or mycotrophic and have lost the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Commiphora Angolensis
''Commiphora angolensis'', also known as sand commiphora or sand corkwood, is a shrub species in the genus ''Commiphora'' growing mainly in Angola and Namibia. The adults and larvae of '' Diamphidia nigroornata'' feed on ''C. angolensis''. The bark of ''C. angolensis'' contains condensed tannins and the anthocyanin petunidin-3-rhamnoglucoside.Chemical study of bark from ''Commiphora angolensis'' Engl. Cardoso Do Vale, J., Bol Escola Farm Univ Coimbra Edicao Cient, 1962, volume 3, page 128abstract See also * List of Southern African indigenous trees and woody lianes This is a list of Southern African trees, shrubs, suffrutices, geoxyles and lianes, and is intended to cover Angola, Botswana, Lesotho, Malawi, Mozambique, Namibia, South Africa, Swaziland, Zambia and Zimbabwe. The notion of 'indigenous' is of ... References External links Flora of ZimbabweKew gardenjstorTree Atlas of NamibiaVille de Geneve - CJB - Base de données des plantes d'Afrique (French) an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prunus
''Prunus'' is a genus of trees and shrubs, which includes (among many others) the fruits plums, cherries, peaches, nectarines, apricots, and almonds. Native to the North American temperate regions, the neotropics of South America, and the paleotropics of Asia and Africa, 430 different species are classified under ''Prunus''. Many members of the genus are widely cultivated for their fruit and for decorative purposes. ''Prunus'' fruit are drupes, or stone fruits. The fleshy mesocarp surrounding the endocarp is edible while the endocarp itself forms a hard, inedible shell called the pyrena ("stone" or "pit"). This shell encloses the seed (or "kernel") which is edible in many species (such as almonds) but poisonous in others (such as apricots). Besides being eaten off the hand, most ''Prunus'' fruit are also commonly used in processing, such as jam production, canning, drying, and seeds for roasting. Botany Members of the genus can be deciduous or evergreen. A few species ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lithocarpus Glaber
''Lithocarpus glaber'', the Japanese oak, is a tree species in the genus '' Lithocarpus'' found in Japan, China and Taiwan. Mitami Shrine, a Shinto shrine in Sakai, Osaka Prefecture, Japan, is famous locally for its comparatively large population of Lithocarpus glaber, known as Shiribukagashi (尻深樫 シリブカガシ). In China, it is called ''ke'' (柯). In Cantonese, it is called ''Seklik'' (石櫟). Condensed tannins from ''L. glaber'' leaves have been analysed through acid-catalyzed degradation in the presence of cysteamine and have a potent free radical scavenging activity. See also * ''Quercus crispula'' - Japanese oak - 水楢 References External links * glaber Glaber, a Latin word meaning ''bald'', may refer to : * Arduin Glaber (died c. 977), the Count of Auriate from c. 935 and Margrave of Turin from c. 950 * Gaius Claudius Glaber, a Roman praetor in 73 BC. that failed to hem in Spartacus and his fell ... Plants described in 1784 {{Fagales-st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temperate Wood
A temperate forest is a forest found between the tropical and boreal regions, located in the temperate zone. It is the second largest biome on our planet, covering 25% of the world's forest area, only behind the boreal forest, which covers about 33%. These forests cover both hemispheres at latitudes ranging from 25 to 50 degrees, wrapping the planet in a belt similar to that of the boreal forest. Due to its large size spanning several continents, there are several main types: deciduous, coniferous, mixed forest, and rainforest. Climate The climate of a temperate forest is highly variable depending on the location of the forest. For example, Los Angeles and Vancouver, Canada are both considered to be located in a temperate zone, however, Vancouver is located in a temperate rainforest, while Los Angeles is more subtropical. Temperate forests typically have winters that often reach below freezing, however even this is not always true. The East Coast forests retain their deciduou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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