The process is used commercially to supplement the natural sources of menthol (oil of peppermint), widely used as a flavouring and in medicinal preparations. 3911Petroleum resins, coumarone-indene resins, ex 3911 10 00-Petroleum resins, coumarone, indene or coumarone-indene resins and, Petroleum resins, coumarone, indene or coumarone-indene resins and. In those cases in which sulfur dehydrogenation fails to yield information about the carbon skeleton of a sesquiterpene, a systematic degradation by oxidation to compounds of known structure is necessary. en.wiktionary.org 39.11Petroleum resins, coumarone-indene resins, (chemistry) any polymeric terpene formed from many isoprene units joined head to tail; includes rubber and gutta-percha. Division into isoprene units is indicated. However, NR alone does not exhibit sufficient adhesive tack, which can be defined as the ability to adhere to other materials with dissimilar compositions [1], Therefore, tackifying resins (e.g., rosin derivatives, aliphatic or aromatic hydrocarbon resins, and, The adhesive composition comprises an amorphous polyalpha-olefin and a tackifier selected from at least one of the group consisting of: petroleum distillates, rosin, rosin esters, and, Absorptions at 1170 and 1145 [cm.sup.-1] typical of isopropyl groups derived from lignin decomposition are more visible in semicoking liquids, while mono-, sesqui-, and, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Synthesis of Modified Natural Rubber With Grafted Poly(acetoacetoxyethyl methacrylate-co-methyl methacrylate) and Performance of Derived Adhesives With GTA Crosslinker, Tackified Amorphous-Poly-Alpha-Olefin-Bonded Structures: No. English Portuguese translation in context, Free: Learn English, French and other languages, Reverso Documents: translate your documents online, Learn English watching your favourite videos, All English definitions from our dictionary. polyterpenes: ( pol'-ter'pnz ), Acyclic polymers containing a large number of isoprene subunits, usually unsaturated. Definition from Wiktionary, the free dictionary Chemical degradation by oxidation and X-ray diffraction studies have revealed a repeating unit in rubber. Originally, plants developed terpenes for evolutionary purposes. Phytol, an oxygenated acyclic diterpene, is an important building block of the chlorophyll molecule, from which it is obtained on treatment with alkali solution. This feature is generally encountered in the tetraterpenes, as is the long series of alternating single and double carbon-to-carbon bonds (conjugated system) that is responsible for the absorption of light and hence the bright colours of the compounds. The elastomer compounds are compositions based on at least one diene elastomer selected from the group of polybutadienes (BRs), synthetic, The first extensive IR spectroscopic studies of synthetic, Increasing the catalyst level and Al/Fe ratio from their low to high designed values will decrease the average DSV by 2.0 and 1.3, respectively; therefore, both variables should be maintained at high levels in order to produce low DSV, Cotan [delta] [??] La dernire modification de cette page a t faite le 5 mai 2023 07:32. WordSense Dictionary: polyterpenes - spelling, hyphenation, synonyms, translations, meanings & definitions. It is among the cheapest organic acids. Definition from Wiktionary, the free dictionary The term is often extended to the terpenoids, which are oxygenated derivatives of these hydrocarbons. polyterpenes Definition - English Dictionary | polyterpenes Terpenes and terpenoids are generally extracted from the starting material by rectification or, as in the extraction of menthol from oil of peppermint, by freezing. polyterpenes - Wiktionary Important oxygenated acyclic monoterpene derivatives include the terpene alcohol citronellol and the corresponding aldehyde citronellal, both of which occur in oil of citronella, as well as citral, found in lemongrass oil, and geraniol, which occurs in Turkish geranium oil. When 'thingamajig' and 'thingamabob' just won't do, A simple way to keep them apart. The acyclic triterpene hydrocarbon squalene constitutes more than half of the liver oil of certain species of sharks and is otherwise rather widely distributed in nature. The dotted lines in the formula show the division into isoprene units, and it is to be noted that the usual head-to-tail attachment of isoprene units is interrupted in the centre of the molecule with a single tail-to-tail attachment that produces a symmetrical structure. The polymeric structure of amber consists of a nonrepetitive polymer with a macromolecular structure based on precursors mainly from the labdane family (labdane is the diterpene (4 aR ,5 S ,6 S ,8 aS )-1,1,4 a ,6-yetramethyl-5- [ (3 R )-3-methylpentyl]decalin, C 20 H 38 ). Isoprenoid compounds - Encyclopedia Britannica Certain tetraterpenoids, such as carotene and xanthophylls, are plant pigments. Rubber, which occurs in the latex of the rubber tree, is a polyterpene hydrocarbon, (C5H8)n, in which n is 4,0005,000. What is the translation of polyterpnes? en.wiktionary.2016 polyterpene - definition and meaning - Wordnik https://encyclopedia2.thefreedictionary.com/Polyterpenoid, A class of naturally occurring compounds whose carbon skeletons are composed exclusively of isopentyl (isoprene) C, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Polytechnics and Colleges Funding Council, Polytechnics International New Zealand Limited. Synonym(s): polyisoprenes , polyisoprenoids CHEBI:51960. Acyclic monoterpene hydrocarbons are few in number, but their oxygenated derivatives are more widespread in nature and of greater importance. Words Starting With Acyclic polymers containing a large number of isoprene subunits, usually unsaturated. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. major reference In isoprenoid: Polyterpenes Rubber, which occurs in the latex of the rubber tree, is a polyterpene hydrocarbon, (C 5 H 8) n, in which n is 4,000-5,000. patents-wipo Petroleum resins, coumarone-indene resins, polyterpenes, polysulphides, polysulphones, etc., n.e.c., in primary forms EurLex-2 Eurlex2019, Petroleum resins, coumarone, indene or coumarone-indene resins and. [1] Chemical degradation by oxidation and X-ray diffraction studies have revealed a repeating unit in rubber. Gutta-percha differs from rubber in the way in which methylene (CH2) groups are arranged; in gutta-percha they are on opposite sides (trans arrangement) of the double bond, and in rubber they are on the same side (cis arrangement). polyterpene resin - English definition, grammar, pronunciation WordSense is a free dictionary containing information about the meaning, the spelling and more.We answer the questions: What does polyterpnes mean in English? polyterpne (French): meaning, translation - WordSense EurLex-2 Leur squelette de carbone est constitu d'units isoprniques mises bout bout, c'est ce que l'on appelle la rgle de l'isoprne. indene or coumarone-indene resins and polyterpenes, for cavity fillingAllAllAll ex 3911 90 90-Other, for cavity fillingAllAllAll 39.16Monofilament of which any cross-sectional dimension exceeds 1 mm, rods, sticks and profile shapes, . Let us know if you have suggestions to improve this article (requires login). Plant Resin - an overview | ScienceDirect Topics polyterpenes) (chemistry) any polymeric terpene formed from many isoprene units joined head to tail; includes rubber. Plural of polyterpne This is the meaning of polyterpne: polyterpne ( French) Origin & history From poly- + terpne Noun polyterpne (masc.) The arrangement of isoprene units in phytol is identical with that in vitamin A, a monocyclic diterpene derivative, and is typical of the head-to-tail arrangement of isoprene units found in most terpenes. Here, we provide an overview on the synthesis and metabolic pathways, regulatory pathways, and key enzymes in the biosynthetic pathways of terpenoids. Polyterpenes | definition of polyterpenes by Medical dictionary Although -ionone cannot be regarded as a terpene, it is of great importance as a starting material for the synthesis of vitamin A and as a component of violet-scented perfumes. terpenes, phenolics and N and S containing compounds. Menthol, geraniol, terpin hydrate, and others are used in medicine. terpene. from Wiktionary, Creative Commons Attribution/Share-Alike License. A nonpolar hydrocarbon resin or a polyterpene resin is particularly used as the tackifier for the adhesive compound (s). Un exemple commun est le, du fait de l'alternance de simples et doubles. Terpenes composed of 5-C synthesized primarily from products of the shikimic acid pathway, have several important defensive role in the plants. Rubber, which occurs in the latex of the rubber tree, is a polyterpene hydrocarbon, (C5H8)n, in which n is 4,0005,000. polyterpene - English definition, grammar, pronunciation, synonyms and The sesquiterpenes demonstrate an even greater complexity of structure than the monoterpenes, and oxygenated sesquiterpenes are commonly encountered. polyterpnes) ( organic chemistry) polyterpene Quote, Rate & Share Cite this page: polyethene, polyisoprene, polythene, polyethylene. The monoterpenes are isolated from their natural sources by distillation of the plant matter with steam. polyterpene (CHEBI:51960) - EMBL-EBI Check out the pronunciation, synonyms and grammar. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Terpene | chemical compound | Britannica It is an optically active oil with a boiling point of 274 C (525 F). It has been found in other fish liver oils, in vegetable oils, in fungi, and in human earwax and sebaceous secretions. Details can be found in the individual articles. terpene: terpenoid terpeneless Hypernyms hydrocarbon Hyponyms diterpene monoterpene polyterpene sesquiterpene sesterterpene tetraterpene triterpene Translations, monoterpene: terms diterpene hemiterpene sesquiterpene sesterterpene triterpene tetraterpene polyterpene Hypernyms terpene hydrocarbon Hyponyms ascaridole, sesquiterpene: terms diterpene hemiterpene monoterpene sesterterpene triterpene tetraterpene polyterpene Hypernyms terpene hydrocarbon Hyponyms aristolochene, diterpene: hemiterpene monoterpene sesquiterpene sesterterpene triterpene tetraterpene polyterpene Hypernyms terpene hydrocarbon Hyponyms abietic acid, triterpene: diterpene hemiterpene monoterpene sesquiterpene sesterterpene tetraterpene polyterpene Hypernyms terpene hydrocarbon Hyponyms betulin ganoderic acid, Cite this page: "polyterpene" WordSense Online Dictionary (30th June, 2023) URL: https://www.wordsense.eu/polyterpene/. Lycopene, the red pigment of the ripe tomato, exemplifies the class of acyclic tetraterpenes. Division into isoprene units is indicated. The biochemical importance of squalene as a metabolic intermediate in the biosynthesis of cholesterol was demonstrated by the use of radioactive carbon labeling. (Most of the time.). Others of this class are terpinolene, - and -phellandrene, and -, -, and -terpinene, all of which have the same carbon skeleton as limonene and differ only in the location of the two carbon-to-carbon double bonds. Terpenes and terpenoids are widely used, both in the pure state and in the form of essential oils and resins, as constituents of perfume compositions, and food extracts. : a natural or synthetic polymer (C5H8)x of a terpene hydrocarbon: such as a : rubber hydrocarbon b : a thermoplastic resin or viscous liquid obtained by polymerization of turpentine or a nopinene fraction by means of a catalyst (as aluminum chloride) and used chiefly in adhesives and rubber goods Word History Etymology polyterpnes - Wiktionary Parmi les terpnes les plus importants, on trouve: En revanche, les carotnodes comme la lutine, comportant des atomes d'oxygne, ne sont pas proprement parler des terpnes, mais des terpnodes. Terpenes are virtually insoluble in water but are readily soluble in nonpolar organic solvents; they are readily oxidized, polymerized, hydrogenated, halogenated, and isomerized. Polyterpenes is one of the first classes of non-polar tack-ifiers to be developed. Ces squelettes peuvent tre arrangs de faon linaire ou bien former des cycles. For example, myrcene is obtained commercially by the pyrolysis of p-pinene at 500C. You can complete the definition of polyterpenes given by the English Definition dictionary with other English dictionaries: Wikipedia, Lexilogos, Oxford, Cambridge, Chambers Harrap, Wordreference, Collins Lexibase dictionaries, Merriam Webster English-Definition dictionary : translate English words into Definition with online dictionaries. https://medical-dictionary.thefreedictionary.com/polyterpenes. Chemical degradation by oxidation and X-ray diffraction studies have revealed a repeating unit in rubber. It is also a major component of sulfate turpentine, a by-product of the manufacture of paper, and is important as a component of paints and varnishes and as a raw material for the production of a wide variety of products employed in the chemical industry. It is the major component of ordinary turpentine, which is prepared from pine trees or stumps either by extraction followed by rectification or by distillation with steam. Definition. Its use in coating materials depends on its properties as a solvent and on its conversion by oxidation into a polymeric resinous film. The vulcanization of rubber involves the establishment of cross-linking between the chains through sulfur atoms. Rubber, which occurs in the latex of the rubber tree, is a polyterpene hydrocarbon, (C 5 H 8) n, in which n is 4,000-5,000. Subscribe to America's largest dictionary and get thousands more definitions and advanced searchad free! The carbon skeleton of -amyrin bears a striking relationship to those of squalene and cholesterol, and it has been shown that squalene is a common precursor of the pentacyclic triterpenes and the sterols in biosynthesis. Learn the definition of 'polyterpene'. Definitions from The Century Dictionary. Mixtures of terpin, -terpineol, terpinolene, and the terpinenes result from the treatment of -pinene with acid, and the mixture finds use as pine oil, an inexpensive disinfectant, deodorant, and wetting agent. Search polyterpenes and thousands of other words in English definition and synonym dictionary from Reverso. Gutta-percha and natural rubber may be regarded as polyterpenes. It is representative of the bicyclic monoterpenes and is the most abundant and important monoterpene. Depending on the number of isoprene links per molecule, terpenes are divided into monoterpenes, C10H16 (usually called terpenes); sesquiterpenes, C15H24; diterpenes, C20H32; triterpenes, C30H48; and so on. Wiktionary Advertisement Other Word Forms of Polyterpene Noun Singular: polyterpene Plural: polyterpenes Find Similar Words Find similar words to polyterpene using the buttons below. Acyclic terpenes may be regarded as isomers and polymers of isoprene units; cyclic forms include menthane, bornane, and camphene. Vous pouvez amliorer la vrifiabilit en associant ces informations des rfrences l'aide d'appels de notes. There are no user-contributed notes for this entry. Les terpnes sont des mtabolites secondaires qui se rencontrent galement chez les . in Drosophila larvae, English Collins Dictionary - English Definition & Thesaurus. Research progress in biosynthesis and regulation of plant terpenoids This paper will provide references for further exploring the molecular regulation and improving the content of terpenoids in plants. There are no user-contributed notes for this entry. Terpenes belong to a broad class of natural compounds, the isoprenoids. Monoterpenes are colorless liquids with a characteristic odor and a boiling point of 150190C. Terpenoid - Wikipedia All rights reserved. The carotenoids are isolated from their natural sources by solvent extraction and are purified by chromatography. Rosin is used in the production of varnish and coating materials. patents-wipo Limonene is optically active (it rotates the plane of polarized light), as are most of the terpenes and their derivatives that contain an asymmetric carbon atomthat is, one bonded to four different groups.
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