|
Morindone
Morindone is an anthraquinone compound obtained from various ''Morinda'' species, especially '' M. tinctoria'', but also '' M. citrifolia''. Its principal use is as a dye, but it has also been investigated for anticancer and microbial uses. Preparation Morindone is obtained from the root bark of ''M. tinctoria'' or related species in two stages. In the first step, small roots of immature plants are boiled in alcohol to obtain morindin, a yellowish substance which can also be used in dyeing. Further heating brings about hydrolysis of two glucose monomers through sublimation, leaving intensely red crystals. ''M. tinctoria'' is extensively grown in India for commercial production. Moridin content in the roots peaks in two to three years and drops off considerably after that; some attempts have been made to speed up production using tissue cultures. Use as a dye Morindone requires a mordant A mordant or dye fixative is a substance used to set (i.e. bind) dyes on fabrics b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morinda Tinctoria
''Morinda tinctoria'', commonly known as aal or Indian mulberry (though these common names also refer to ''Morinda citrifolia''), is a species of flowering plant in the family Rubiaceae, native to southern Asia. It is an evergreen shrub or small tree growing to 5–10 m tall. The leaves are 15–25 cm long, oblong to lanceolate. The flowers are tubular, white, scented, about 2 cm long. The fruit is a green syncarp, 2-2.5 cm diameter. The plant is extensively cultivated in India in order to make the morindone dye sold under the trade name "Suranji". Morindone is used for the dyeing of cotton, silk and wool in shades of red, chocolate or purple. The colouring matter is found principally in the root bark and is collected when the plants reach three to four years of age. If the trees are allowed to mature then hardly any colouring substance remains. The small roots yield the most dye and those above about 1 cm diameter are discarded. The active substance is e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morindin
Morindin is an anthraquinone glycoside present in several ''Morinda'' species, especially '' M. tinctoria'' (the Indian mulberry tree) and '' M. citrifolia'' (noni). Chemical or enzymatic hydrolysis of morindin yields its bright red aglycone, morindone. The structure and formula of morindin were first elucidated by Thomas Edward Thorpe Sir Thomas Edward Thorpe CB, FRS H FRSE LLD (8 December 1845 – 23 February 1925) was a British chemist. From 1894 to 1909 he was Chief Chemist to the British Government, as Director of the Government Laboratory. Early life and education Th ... and T. H. Greenall in 1887. References Anthraquinone dyes Anthraquinone glycosides Natural dyes Trihydroxyanthraquinones {{Organic-compound-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anthraquinones
''For the parent molecule 9,10-anthraquinone, see anthraquinone'' Anthraquinones (also known as anthraquinonoids) are a class of naturally occurring phenolic compounds based on the 9,10-anthraquinone skeleton. They are widely used industrially and occur naturally. Occurrence in plants : Natural pigments that are derivatives of anthraquinone are found, inter alia, in aloe latex, senna, rhubarb, and cascara buckthorn, fungi A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from ..., lichens, and some insects. A type II polyketide synthase is responsible for anthraquinone biosynthesis in the bacterium ''Photorhabdus luminescens''. Chorismate, formed by isochorismate synthase in the shikimate pathway, is a precursor of anthraquinones in ''Morinda citrifolia''. Tests for anthraquinones in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
India
India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast, it shares land borders with Pakistan to the west; China, Nepal, and Bhutan to the north; and Bangladesh and Myanmar to the east. In the Indian Ocean, India is in the vicinity of Sri Lanka and the Maldives; its Andaman and Nicobar Islands share a maritime border with Thailand, Myanmar, and Indonesia. Modern humans arrived on the Indian subcontinent from Africa no later than 55,000 years ago., "Y-Chromosome and Mt-DNA data support the colonization of South Asia by modern humans originating in Africa. ... Coalescence dates for most non-European populations average to between 73–55 ka.", "Modern human beings—''Homo sapiens''—originated in Africa. Then, int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anthraquinone Dyes
Anthraquinone dyes are an abundant group of dyes comprising a anthraquinone unit as the shared structural element. Anthraquinone itself is colourless, but red to blue dyes are obtained by introducing electron donor groups such as hydroxy or amino groups in the 1-, 4-, 5- or 8-position. Anthraquinone dyestuffs are structurally related to indigo dyestuffs and are classified together with these in the group of carbonyl dyes. Members of this dye group can be found in natural dyes as well as in synthetic dyes. Anthraquinone dyestuffs are represented in mordant and vat, but also in reactive and disperse dyes. They are characterized by very good light fastness. Natural anthraquinone dyes One of the most important anthraquinone dyes of herbal origin is alizarin, which is extracted from the dyer's madder ( Rubia tinctorum). Alizarin is the eponym for a number of structurally related dyes that use alizarin dyes (sometimes synonymous with anthraquinone dyes). It was the first natural ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural Dyes
Natural dyes are dyes or colorants derived from plants, invertebrates, or minerals. The majority of natural dyes are vegetable dyes from plant sources—roots, berries, bark, leaves, and wood—and other biological sources such as fungi. Archaeologists have found evidence of textile dyeing dating back to the Neolithic period. In China, dyeing with plants, barks and insects has been traced back more than 5,000 years.Goodwin (1982), p. 11. The essential process of dyeing changed little over time. Typically, the dye material is put in a pot of water and heated to extract the dye compounds into solution with the water. Then the textiles to be dyed are added to the pot, and held at heat until the desired color is achieved. Textile fibre may be dyed before spinning or weaving ("dyed in the wool"), after spinning ("yarn-dyed") or after weaving ("piece-dyed"). Many natural dyes require the use of substances called mordants to bind the dye to the textile fibres. Mordants (from the Latin ver ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Watts (chemist)
Henry Watts (1815–1884) was an English chemist. Life He was born in London on 20 January 1810. He went to a public school, and was articled at the age of 10 as an architect and surveyor; but went on to support himself by teaching, chiefly mathematical, privately and at a school. He then attended University College, zimbabwe. In 1841 he graduated B.A. in the University of Lon. In 1846 he became assistant to George Fownes, professor of practical chemistry at University College, and occupied this post, after Fownes's death in 1849, until 1857, under Professor Alexander William Williamson. Having an impediment in speech he found himself unable to obtain a professorship, and worked on the literature of chemistry. In 1847 he was elected fellow of the Chemical Society. On 17 December 1849 he was elected editor of the Chemical Society's ''Journal'', and about the beginning of 1860 he also became librarian to the society. Early in 1871 it was decided to print in the society's journal ab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Symplocos Fasciculata
''Symplocos fasciculata'' is a tree in the family Symplocaceae, native to tropical Asia. The specific epithet ''fasciculata'' means 'bundled' and refers to the inflorescence. Description ''Symplocos fasciculata'' grows up to tall, occasionally to , with a trunk diameter of up to . The smooth bark may be brown or grey, occasionally green. The twigs are somewhat zig-zag. The papery leaves, of varying shapes, measure up to long. The inflorescences feature fascicles of bundled racemes bearing white flowers. Distribution and habitat ''Symplocos fasciculata'' is native to the Nicobar Islands, Peninsular Malaysia, Sumatra, Borneo, Java, the Philippines and Sulawesi. Its habitat is ''kerangas'' and mixed dipterocarp forests, at elevations to . Uses In Java, the bark and leaves of ''Symplocos fasciculata'' are used to make dyes, including for ''batik Batik is an Indonesian technique of wax-resist dyeing applied to the whole cloth. This technique originated from the island ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mordant
A mordant or dye fixative is a substance used to set (i.e. bind) dyes on fabrics by forming a coordination complex with the dye, which then attaches to the fabric (or tissue). It may be used for dyeing fabrics or for intensifying stains in biological specimen, cell or tissue preparations. Although mordants are still used, especially by small batch dyers, it has been largely displaced in industry by substantive dye, directs.} The term mordant comes from the Latin ''mordere'', "to bite". In the past, it was thought that a mordant helped the dye bite onto the fiber so that it would hold fast during washing. A mordant is often a polyvalency (chemistry), polyvalent metal ion, and one example is chromium (III). The resulting coordination complex of dye and ion is colloidal and can be either acidic or base (chemistry), alkaline. Common dye mordants Mordants include tannic acid, oxalic acid, alum, chrome alum, sodium chloride, and certain salt (chemistry), salts of aluminium, chrom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monomer
In chemistry, a monomer ( ; ''mono-'', "one" + '' -mer'', "part") is a molecule that can react together with other monomer molecules to form a larger polymer chain or three-dimensional network in a process called polymerization. Classification Monomers can be classified in many ways. They can be subdivided into two broad classes, depending on the kind of the polymer that they form. Monomers that participate in condensation polymerization have a different stoichiometry than monomers that participate in addition polymerization: : Other classifications include: *natural vs synthetic monomers, e.g. glycine vs caprolactam, respectively *polar vs nonpolar monomers, e.g. vinyl acetate vs ethylene, respectively *cyclic vs linear, e.g. ethylene oxide vs ethylene glycol, respectively The polymerization of one kind of monomer gives a homopolymer. Many polymers are copolymers, meaning that they are derived from two different monomers. In the case of condensation polymerizations, the r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sublimation (chemistry)
Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state. Sublimation is an endothermic process that occurs at temperatures and pressures below a substance's triple point in its phase diagram, which corresponds to the lowest pressure at which the substance can exist as a liquid. The reverse process of sublimation is deposition or desublimation, in which a substance passes directly from a gas to a solid phase. Sublimation has also been used as a generic term to describe a solid-to-gas transition (sublimation) followed by a gas-to-solid transition ( deposition). While vaporization from liquid to gas occurs as evaporation from the surface if it occurs below the boiling point of the liquid, and as boiling with formation of bubbles in the interior of the liquid if it occurs at the boiling point, there is no such distinction for the solid-to-gas transition which always occurs as sublimation from the surface. At ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morinda
''Morinda'' is a genus of flowering plants in the madder family, Rubiaceae. The generic name is derived from the Latin words ''morus'' "mulberry", from the appearance of the fruits, and ''indica'', meaning "of India". Description Distributed in all tropical regions of the world, ''Morinda'' includes 80 species of trees, shrubs or vines. All ''Morinda'' species bear aggregate or multiple fruits that can be fleshy (like ''Morinda citrifolia'') or dry. Most species of this genus originate in the area of Borneo, New Guinea, Northern Australia and New Caledonia. In traditional Japanese, Korean and Chinese medicine, ''Morinda citrifolia'' is considered to be a herb with biological properties, although there is no confirmed evidence of clinical efficacy. Fossil record The first fossil record for genus ''Morinda'' is from fruit of ''Morinda chinensis'' found in coal dated from the Eocene in the Changchang Basin of Hainan Island, South China. Selected species Plants in the former ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
