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Co-pigmentation
Copigmentation is a phenomenon where pigmentation due to anthocyanidins is reinforced by the presence of other colorless flavonoids known as cofactors or “copigments”. This occurs by the formation of a non-covalently-linked complex. Examples ;Flowers An example is the bluish purple flowers of the Japanese garden iris (''Iris ensata''). The characteristic floral jade coloration of ''Strongylodon macrobotrys'' has been shown to be an example of copigmentation, a result of the presence of malvin (the anthocyanin) and saponarin (a flavone glucoside) in the ratio 1:9.Greenish blue flower colour of Strongylodon macrobotrys. Kosaku Takeda, Aki Fujii, Yohko Senda and Tsukasa Iwashina, Biochemical Systematics and Ecology, Volume 38, Issue 4, August 2010, Pages 630–633, ;Berries It is a phenomenon observed in the berry color of the porcelain berry (''Ampelopsis glandulosa ''Ampelopsis glandulosa'' is a species of plant native to China, Japan, India, Nepal, Myanmar, Vietnam, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wine Color
The color of wine is one of the most easily recognizable characteristics of wines. Color is also an element in wine tasting since heavy wines generally have a deeper color. The accessory traditionally used to judge the wine color was the tastevin, a shallow cup allowing one to see the color of the liquid in the dim light of a cellar. The color is an element in the classification of wines. Color origins The color of the wine mainly depends on the color of the drupe of the grape variety. Since pigments are localized in the center of the grape drupe, not in the juice, the color of the wine depends on the method of vinification and the time the must is in contact with those skins, a process called maceration. The Teinturier grape is an exception in that it also has a pigmented pulp. The blending of two or more varieties of grapes can explain the color of certain wines, like the addition of Rubired to intensify redness. Red drupe grapes can produce white wine if they are quickly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anthocyanidin
Anthocyanidins are common plant pigments, the sugar-free counterparts of anthocyanins. They are based on the flavylium cation, an oxonium ion, with various groups substituted for its hydrogen atoms. They generally change color from red through purple, blue, and bluish green as a function of pH. Anthocyanidins are an important subclass of the polymethine dyes and flavonoids. The flavylium cation is a chromenylium cation with a phenyl group substituted in position 2; and chromenylium (also called benzopyrylium) is a bicyclic version of pyrylium. The positive charge can move around the molecule. At least 31 monomeric anthocyanidins have been properly identified in living organisms, mostly as the core components of anthocyanins. The latter are responsible for the red, purple, blue, or black color of many fruits (like grapes and blueberries), flowers (like roses), leaves (like purple cabbage), and even tubers (like radishes and purple yams). They are also found in some animals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flavonoid
Flavonoids (or bioflavonoids; from the Latin word ''flavus'', meaning yellow, their color in nature) are a class of polyphenolic secondary metabolites found in plants, and thus commonly consumed in the diets of humans. Chemically, flavonoids have the general structure of a 15-carbon skeleton, which consists of two phenyl rings (A and B) and a heterocyclic ring (C, the ring containing the embedded oxygen). This carbon structure can be abbreviated C6-C3-C6. According to the IUPAC nomenclature, they can be classified into: *flavonoids or bioflavonoids *isoflavonoids, derived from 3-phenyl chromen-4-one (3-phenyl-1,4-benzopyrone) structure *neoflavonoids, derived from 4-phenylcoumarine (4-phenyl-1,2-benzopyrone) structure The three flavonoid classes above are all ketone-containing compounds and as such, anthoxanthins ( flavones and flavonols). This class was the first to be termed bioflavonoids. The terms flavonoid and bioflavonoid have also been more loosely used to describe non ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Complex (chemistry)
A coordination complex consists of a central atom or ion, which is usually metallic and is called the ''coordination centre'', and a surrounding array of bound molecules or ions, that are in turn known as ''ligands'' or complexing agents. Many metal-containing compounds, especially those that include transition metals (elements like titanium that belong to the Periodic Table's d-block), are coordination complexes. Nomenclature and terminology Coordination complexes are so pervasive that their structures and reactions are described in many ways, sometimes confusingly. The atom within a ligand that is bonded to the central metal atom or ion is called the donor atom. In a typical complex, a metal ion is bonded to several donor atoms, which can be the same or different. A polydentate (multiple bonded) ligand is a molecule or ion that bonds to the central atom through several of the ligand's atoms; ligands with 2, 3, 4 or even 6 bonds to the central atom are common. These compl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iris Ensata
''Iris ensata'', the Japanese iris or Japanese water iris (Japanese: ''hanashōbu''), formerly ''I. kaempferi'', is a species of flowering plant in the family Iridaceae, native to Japan, China, Korea and Russia, and widely cultivated as an ornamental plant. "Japanese iris" may also refer to '' I. sanguinea'' and '' I. laevigata'', both native to Japan. Description ''Iris ensata'' is an erect rhizomatous herbaceous perennial growing to tall, with strap-shaped leaves. The flower, appearing in midsummer, is purple with a flash of yellow on the falls. The bluish purple color of the flowers is an example of the copigmentation phenomenon. Habitat Widely distributed throughout the Japanese archipelago and elsewhere, ''I. ensata'' is very hardy down to . It prefers a boggy or marshy environment and soil with a low (acidic) pH. In favourable conditions it will eventually form sizable clumps. Cultivation ''Iris ensata'' is extensively grown as an ornamental plant in gardens and parks t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jade (color)
Varieties of the color green may differ in hue, chroma (also called saturation or intensity) or lightness (or value, tone, or brightness), or in two or three of these qualities. Variations in value are also called tints and shades, a tint being a green or other hue mixed with white, a shade being mixed with black. A large selection of these various colors is shown below. Computer web color greens Green The color defined as ''green'' in the RGB color model is the brightest green that can be reproduced on a computer screen, and is the color named ''green'' in X11. It is one of the three primary colors used in the RGB color space along with red and blue. The three additive primaries in the RGB color system are the three colors of light chosen such as to provide the maximum range of colors that are capable of being represented on a computer or television set. This color is also called ''regular green''. It is at precisely 120 degrees on the HSV color wheel, also known as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strongylodon Macrobotrys
''Strongylodon macrobotrys'', commonly known as jade vine, emerald vine''The Royal Horticultural Society A–Z Encyclopedia of Garden Plants'', ed. Christopher Brickell, Dorling Kindersley, London, 1996, , p987 or turquoise jade vine, is a species of leguminous perennial liana (woody vine) endemic to the tropical forests of the Philippines. Its local name is ''tayabak''. A member of the Fabaceae (the pea and bean family), it is closely related to beans such as kidney bean and runner bean. ''Strongylodon macrobotrys'' is pollinated by bats. Origins ''Strongylodon macrobotrys'' was discovered in 1841 on the jungled slopes of Mount Makiling, on the Philippines’ Luzon Island, by members of the United States Exploring Expedition led by U.S. Navy Lt. Charles Wilkes. One can only imagine how startling that apparition must have been, but we are left only with the description of the Harvard-based botanist Asa Gray, who had locked horns with Wilkes previously and elected not to join th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malvin
Malvin is a naturally occurring chemical of the anthocyanin family. Malvin reacts in the presence of H2O2 to form malvone. The ortho-benzoyloxyphenylacetic acid esters reaction product is dependant of the pH: it is obtained under acidic conditions whereas under neutral conditions, the reaction product is the 3-O-acyl-glucosyl-5-O-glucosyl-7-hydroxy coumarin. Natural occurrences It is a diglucoside of malvidin mainly found as a pigment in herbs like Malva (''Malva sylvestris''), ''Primula'' and ''Rhododendron''. ''M. sylvestris'' also contains malonylmalvin (malvidin 3-(6″-malonylglucoside)-5-glucoside).Malonated anthocyanins in malvaceae: Malonylmalvin from Malva sylvestris. Kosaku Takeda, Shigeki Enoki, Jeffrey B. Harborne and John Eagles, Phytochemistry, 1989, Volume 28, Issue 2, Pages 499–500, The characteristic floral jade coloration of ''Strongylodon macrobotrys'' has been shown to be an example of copigmentation, a result of the presence of malvin and saponarin ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saponarin
Saponarin is a flavone glucoside. It is found in ''Saponaria officinalis'' and in ''Strongylodon macrobotrys'' where it imparts the characteristic jade color to the flower. This coloration has been shown to be an example of copigmentation, a result of the presence of malvin (an anthocyanin) and saponarin in the ratio 1:9. Under the alkaline conditions ( pH 7.9) found in the sap of the epidermal cells, this combination produced a blue-green pigmentation; the pH of the colorless inner floral tissue was found to be lower, at pH 5.6. Experiments showed that saponarin produced a strong yellow colouring in slightly alkaline conditions, resulting in the greenish tone of the flower.Greenish blue flower colour of Strongylodon macrobotrys. Kosaku Takeda, Aki Fujii, Yohko Senda and Tsukasa Iwashina, Biochemical Systematics and Ecology, Volume 38, Issue 4, August 2010, Pages 630–633, It is also found in passion flowers (''Passiflora ''Passiflora'', known also as the passion fl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flavone
Flavone is an organic compound with the formula . A white solid, flavone is a derivative of chromone with a phenyl (Ph) substituent adjacent to the ether group. The compound is of little direct practical importance, but susbstituted derivatives, the flavones and flavonoids are a large class of nutritionally important natural products. Flavone can be prepared in the laboratory by cyclization of 2-hydroxacetophenone. Isomeric with flavone is isoflavone, where the phenyl group is adjacent to the ketone In organic chemistry, a ketone is a functional group with the structure R–C(=O)–R', where R and R' can be a variety of carbon-containing substituents. Ketones contain a carbonyl group –C(=O)– (which contains a carbon-oxygen double bo .... References {{Flavones ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glucoside
A glucoside is a glycoside that is derived from glucose. Glucosides are common in plants, but rare in animals. Glucose is produced when a glucoside is hydrolysed by purely chemical means, or decomposed by fermentation or enzymes. The name was originally given to plant products of this nature, in which the other part of the molecule was, in the greater number of cases, an aromatic aldehydic or phenolic compound (exceptions are Jinigrin and Jalapin or Scammonin). It has now been extended to include synthetic ethers, such as those obtained by acting on alcoholic glucose solutions with hydrochloric acid, and also the polysaccharoses, e.g. cane sugar, which appear to be ethers also. Although glucose is the most common sugar present in glucosides, many are known which yield rhamnose or iso-dulcite; these may be termed pentosides. Much attention has been given to the non-sugar parts (aglyca) of the molecules; the constitutions of many have been determined, and the compounds synthesi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ampelopsis Glandulosa
''Ampelopsis glandulosa'' is a species of plant native to China, Japan, India, Nepal, Myanmar, Vietnam, and the Philippines. Varieties Several varieties are distinguished: * var. ''hancei'' * var. ''kulingensis'' * var. ''glandulosa'' * var. * var. ''brevipedunculata'' Cultivation ''Ampelopsis glandulosa'' is used as an ornamental plant in garden A garden is a planned space, usually outdoors, set aside for the cultivation, display, and enjoyment of plants and other forms of nature. The single feature identifying even the wildest wild garden is ''control''. The garden can incorporate bot ...s. References glandulosa {{Vitaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
