|
Methyl Gallate
Methyl gallate is a phenolic compound. It is the methyl ester of gallic acid. Natural occurrences It is found in ''Terminalia myriocarpa'', ''Bergenia ciliata'' (hairy Bergenia) and ''Geranium niveum''. It is found in the fruit extract of '' Paeonia anomala''. It is also found in wine.Simultaneous Determination of Nonanthocyanin Phenolic Compounds in Red Wines by HPLC-DAD/ESI-MS. María Monagas, Rafael Suárez, Carmen Gómez-Cordovés and Begoña Bartolomé, Am J Enol Vitic. June 2005, 56, pages 139-147 See also * Phenolic content in wine The phenolic content in wine refers to the phenolic compounds—natural phenol and polyphenols—in wine, which include a large group of several hundred chemical compounds that affect the taste, color and mouthfeel of wine. These compounds include ... References Phenolic acids Methyl esters {{aromatic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Methyl
In organic chemistry, a methyl group is an alkyl derived from methane, containing one carbon atom bonded to three hydrogen atoms, having chemical formula . In formulas, the group is often abbreviated as Me. This hydrocarbon group occurs in many organic compounds. It is a very stable group in most molecules. While the methyl group is usually part of a larger molecule, bounded to the rest of the molecule by a single covalent bond (), it can be found on its own in any of three forms: methanide anion (), methylium cation () or methyl radical (). The anion has eight valence electrons, the radical seven and the cation six. All three forms are highly reactive and rarely observed. Methyl cation, anion, and radical Methyl cation The methylium cation () exists in the gas phase, but is otherwise not encountered. Some compounds are considered to be sources of the cation, and this simplification is used pervasively in organic chemistry. For example, protonation of methanol gives an elect ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ester
In chemistry, an ester is a compound derived from an oxoacid (organic or inorganic) in which at least one hydroxyl group () is replaced by an alkoxy group (), as in the substitution reaction of a carboxylic acid and an alcohol. Glycerides are fatty acid esters of glycerol; they are important in biology, being one of the main classes of lipids and comprising the bulk of animal fats and vegetable oils. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. They perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Phosphoesters form the backbone of DNA molecules. Nitrate esters, such as nitroglycerin, are known for their explosive properties. '' Nomenclature Etymology Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gallic Acid
Gallic acid (also known as 3,4,5-trihydroxybenzoic acid) is a trihydroxybenzoic acid with the formula C6 H2( OH)3CO2H. It is classified as a phenolic acid. It is found in gallnuts, sumac, witch hazel, tea leaves, oak bark, and other plants. It is a white solid, although samples are typically brown owing to partial oxidation. Salts and esters of gallic acid are termed "gallates". Isolation and derivatives Gallic acid is easily freed from gallotannins by acidic or alkaline hydrolysis. When heated with concentrated sulfuric acid, gallic acid converts to rufigallol. Hydrolyzable tannins break down on hydrolysis to give gallic acid and glucose or ellagic acid and glucose, known as gallotannins and ellagitannins, respectively. Biosynthesis Gallic acid is formed from 3-dehydroshikimate by the action of the enzyme shikimate dehydrogenase to produce 3,5-didehydroshikimate. This latter compound aromatizes. Reactions Oxidation and oxidative coupling Alkaline solutions of gallic a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terminalia Myriocarpa
''Terminalia myriocarpa'', the East Indian almond, is a tree species in the genus ''Terminalia'' found in Southeast Asia. Ecology The larvae of the moth '' Acrocercops terminaliae'' feed on ''T. myriocarpa''. Chemistry The phenolic compounds methyl (S)-flavogallonate, gallic acid, methyl gallate, ethyl gallate, 2,3-di-O- S)-4,5,6,4′,5′,6′-hexahydroxybiphenyl-2,2′-diyldicarbonyl(α/β)-D-glucopyranose, vitexin, isovitexin, orientin, iso-orientin, kaempferol 3-O-β-D-rutinoside, rutin, neosaponarin, ellagic acid, flavogallonic acid and (α/β)-punicalagin Punicalagin is an ellagitannin, a type of phenolic compound. It is found as alpha and beta isomers in pomegranates (''Punica granatum''), ''Terminalia catappa'', ''Terminalia myriocarpa'', and in ''Combretum molle'', the velvet bushwillow, a plant ... can be isolated from the leaves of ''T. myriocarpa''.Pharmacologically Active Ellagitannins from Terminalia myriocarpa. Mohamed S.A. Marzouk, Sayed A.A. El-Toumy, Fatma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bergenia Ciliata
''Bergenia ciliata'' (fringed elephant's ears, winter begonia, hairy bergenia, Hindi & Sanskrit : ''Pashanbheda'', पाषाणभेद) is a plant species in the genus ''Bergenia'', deciduous in Usda zone, USDA Zones 5 to 7, but usually remain semi-evergreen south of Zone 7. It is found in North India, Northern India in Uttarakhand (Chamoli district, Chamoli and other districts of Uttarakhand) and Himachal Pradesh (in district Shimla district, Shimla). This flower is related to the famous Phool Dei Festival (https://www.tourmyindia.com/states/uttarakhand/phool-dei-festival.html) celebrated in Uttarakhand. It is commonly known in India as Pathar phor buti. Also found in mountain areas of West Bengal, like Kalimpong, and Darjeeling. Afghanistan, south Tibet, Northern Nepal, Bhutan (Haa District, Haa and Mongar District, Mongar districts). Bergenin, catechin, gallic acid, gallicin, catechin-7-O-glucoside and β-sitosterol can be found in ''B. ciliata''. It is known for its us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geranium Niveum
''Geranium niveum'' is a plant species in the genus '' Geranium''. It is a medicinal herb widely used by the Tarahumara Indians of Mexico. Geranin A (epi-afzelechin-(4β→8, 2β→O→7)-afzelechin), geranin B (epi-catechin-(4β→8, 2β→O→7)-afzelechin), mahuannin B, reynoutrin, hyperin, methyl gallate and 3-beta-caffeoyl-12-oleanen-28-oic acid can be found in ''G. niveum''. References External links ''Geraniumm niveum'' at CollectionSearchCenter niveum Flora of Mexico Plants described in 1886 {{Geraniaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paeonia Anomala
''Paeonia anomala'' is a species of herbaceous perennial peony. This plant is ½-1 m high, with a thick irregular taproot and thin side roots. The deeply incised leaves have leaflets which are themselves divided in fine segments. It flowers in early summer, almost always with only one fully developed flower per stem, magenta-red or rarely pink or white. The species occurs in a zone between northern European Russia and northern Mongolia and south to the Tien Shan Mountains. In garden cultivation, it requires full sun or half-shade and well-drained soil. Double-flowered forms are found in cultivation. Description ''Paeonia anomala'' is a non-woody species of peony ½–1 m high, with an irregular ''carrot-shaped'' taproot over ½ m long and 2 cm thick, gradually getting thinner downwards with slender side roots. Like all diploid peonies, it has 10 chromosomes (2n=10). Leaves and stems The leaves have no sheath or stipules and are alternately arranged along t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phenolic Content In Wine
The phenolic content in wine refers to the phenolic compounds—natural phenol and polyphenols—in wine, which include a large group of several hundred chemical compounds that affect the taste, color and mouthfeel of wine. These compounds include phenolic acids, stilbenoids, flavonols, dihydroflavonols, anthocyanins, flavanol monomers (catechins) and flavanol polymers (proanthocyanidins). This large group of natural phenols can be broadly separated into two categories, flavonoids and non-flavonoids. Flavonoids include the anthocyanins and tannins which contribute to the color and mouthfeel of the wine. The non-flavonoids include the stilbenoids such as resveratrol and phenolic acids such as benzoic, caffeic and cinnamic acids. Origin of the phenolic compounds The natural phenols are not evenly distributed within the fruit. Phenolic acids are largely present in the pulp, anthocyanins and stilbenoids in the skin, and other phenols (catechins, proanthocyanidins and flavonols) in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phenolic Acids
Phenolic acids or phenolcarboxylic acids are types of aromatic acid compounds. Included in that class are substances containing a phenolic ring and an organic carboxylic acid function (C6-C1 skeleton). Two important naturally occurring types of phenolic acids are hydroxybenzoic acids and hydroxycinnamic acids, which are derived from non-phenolic molecules of benzoic and cinnamic acid, respectively. Occurrences Phenolic acids can be found in many plant species. Their content in dried fruits can be high. Natural phenols in horse grams (''Macrotyloma uniflorum'') are mostly phenolic acids, namely 3,4-dihydroxy benzoic, ''p''-hydroxy benzoic, vanillic, caffeic, ''p''-coumaric, ferulic, syringic, and sinapinic acids. Phenolic acids can be found in several mushroom-forming species of basidiomycetes. It is also a part of the humic substances, which are the major organic constituents of soil humus. Many phenolic acids can be found in human urine. Chemistry Immobilized ''Ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
