polyterpenes definition

For example, myrcene is obtained commercially by the pyrolysis of p-pinene at 500C. in Drosophila larvae, English Collins Dictionary - English Definition & Thesaurus. Although tricyclic and tetracyclic triterpenes are known, by far the most abundant triterpenes found in nature are those having five carbon rings. Eurlex2019, Petroleum resins, coumarone, indene or coumarone-indene resins and. Cite this page: "polyterpnes" WordSense Online Dictionary (30th June, 2023) URL: https://www.wordsense.eu/polyterpnes/. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Polyterpenes | definition of polyterpenes by Medical dictionary Let us know if you have suggestions to improve this article (requires login). All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. The fact that their structures can be built up from isoprene units justifies their classification as terpenes. [ trpn] (organic chemistry) C 10 H 16 A moderately toxic, flammable, unsaturated hydrocarbon liquid found in essential oils and plant oleoresins; used as an intermediate for camphor, menthol, and terpineol. International Scientific Vocabulary poly- + terpene. 7,517,579; Stephen Campbell, Daniel Hesse, Richard Schultz, Mark Jung, Richard Hansen; Cristian Neculescu, Sandra Rogers, Violet Grube, Rhiannon Thoresen, Thomas Killian, Jonathan Rice, Palani Wallajapet, Courtney Shea, Jason Fairbanks, Prasad Potnis and Randall Palmer, assignors to Kimberly-Clark Worldwide, Inc., Neenah, WI, Trends in biomass thermochemical liquefaction: global experience and recent studies in Estonia/Biomassi termokeemiline vedeldamine: maailmapraktika ja hiljutised uuringud Eestis, Polytechnics and Colleges Funding Council, Polytechnics International New Zealand Limited. The references include Wikipedia, Cambridge Dictionary Online and others. Terpenes are aromatic molecules found in all kinds of vegetation, which give individual plants and flowers their unique scents. (pl. 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. denoting a type of giant-size chromosome consisting of many replicated genes in parallel, found esp. Stars. The structures of many of the pentacyclic triterpenes are known in full detail; that of -amyrin exemplifies the important structural features of this class of substances. Les terpnes sont des mtabolites secondaires qui se rencontrent galement chez les . 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: 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/. Polyterpene | chemical compound | Britannica polyterpenes) ( chemistry ) any polymeric terpene formed from many isoprene units joined head to tail ; includes rubber and gutta-percha Related words & phrases Chemical degradation by oxidation and X-ray diffraction studies have revealed a repeating unit in rubber. polyterpenes, (C5H8)n. Many of the isoprenoids possess carbon skeletons that may be regarded as built up from isoprene units linked head to tail; that is, carbon atom 1 of one unit is bonded to carbon atom 4 of the next unit. It has been found in other fish liver oils, in vegetable oils, in fungi, and in human earwax and sebaceous secretions. en.wiktionary.org Division into isoprene units is indicated. Polyterpenoid | Article about Polyterpenoid by The Free Dictionary Rosin is used in the production of varnish and coating materials. Ces squelettes peuvent tre arrangs de faon linaire ou bien former des cycles. Isolation and identification of isoprenoids, Analysis and determination of isoprenoid structure, Citronella oil is used in perfumes and soaps. Noun Filter noun (chemistry) Any polymeric terpene formed from many isoprene units joined head to tail; includes rubber and gutta-percha. Synonym (s): polyisoprenes, polyisoprenoids Farlex Partner Medical Dictionary Farlex 2012 Want to thank TFD for its existence? 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. https://medical-dictionary.thefreedictionary.com/polyisoprenes. polyterpne - Wiktionary Division into isoprene units is Read More isoprenoids Acyclic polymers containing a large number of isoprene subunits, usually unsaturated. A Brief Introduction To Terpenes: Monoterpenes, Sesquiterpenes, And Feodor Lynen et Konrad Bloch ont dcrit en 1964 la biosynthse des terpnes puis Feodor Lynen publia en 1965 un livre intitul L'acide actique activ Terpnes et acides de matire grasse. 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. Meaning of polyterpenes for the defined word. Many terpenoids are prepared commercially from more accessible terpenes or from chemical raw material. You must there are over 200,000 words in our free online dictionary, but you are looking for one thats only in the Merriam-Webster Unabridged Dictionary. The role of vitamin A and structurally related terpenoid molecules in the synthesis of the pigments in the eye that are necessary for vision has been demonstrated. Purification is usually achieved by fractional distillation at reduced pressures or by regeneration from a crystalline derivative. [1] The yellow, orange, or red fat-soluble plant and animal pigments, known as carotenoids, are classed as tetraterpenes, although they have in general the molecular formula C40H56, rather than C40H64. Les terpnes (de l'allemand Terpen provenant de das Terpentin , la trbenthine) sont une classe d'hydrocarbures, produits par de nombreuses plantes, en particulier les conifres.Ce sont des composants majeurs de la rsine et de l'essence de trbenthine produite partir de rsine. Limonene (shown above), an oil of normal boiling point 178 C (352 F), is a major component of orange and lemon oils and is typical of the monocyclic monoterpene hydrocarbons. Terpene | chemical compound | Britannica Hear a word and type it out. A C 5n terpene, where n is greater than 8. Un exemple commun est le, du fait de l'alternance de simples et doubles. Terpene - Wikipedia polyterpenes definition | English definition dictionary | Reverso Chemical degradation by oxidation and X-ray diffraction studies have revealed a repeating unit in rubber. ChEBI Ontology. Chemical degradation by oxidation and X-ray diffraction studies have revealed a repeating unit in rubber. What is the translation of polyterpnes? 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 ). polyterpne - Dfinitions Franais : Retrouvez la dfinition de polyterpne. Citral, upon reduction with sodium amalgam, yields geraniol, an important component of rose-scented perfumes. 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] [??] It is a source of several monoterpene derivatives, including citronellol, citronellal, and citral. The pentacyclic triterpenes, either free or combined with sugars in glycosides (saponins), occur in all parts of many plants. Dictionary entries. Citronellal is converted by treatment with acid into the monocyclic monoterpene alcohol isopulegol, from which a mixture of stereoisomeric menthols is produced by catalytic hydrogenation. polyterpene resin - English definition, grammar, pronunciation 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. Grammatically, this word "polyterpenes" is a noun, more specifically, a noun form. Definition of terpenes Hydrocarbons of biological origin having carbon skeletons formally derived from isoprene [CH2=C (CH3)CH=CH2]. any of a class of hydrocarbons whose molecules are composed of isoprene links, C5H8; that is, their composition is (C5H8)n where n = 2,3,4. It is representative of the bicyclic monoterpenes and is the most abundant and important monoterpene. Delivered to your inbox! 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. Few commercial uses, other than as flavourings, exist for the monocyclic monoterpene hydrocarbons. The term is often extended to the terpenoids, which are oxygenated derivatives of these hydrocarbons. Rubber, which occurs in the latex of the rubber tree, is a polyterpene hydrocarbon, (C5H8)n, in which n is 4,0005,000. WordSense is a free dictionary containing information about the meaning, the spelling and more.We answer the question: How do you spell polyterpene? 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. Isoprenoid compounds - Encyclopedia Britannica Definition of terpenes - Chemistry Dictionary The best source of -amyrin is the resin elemi, obtained primarily from trees in the family of flowering plants known as Burseraceae. It is an optically active oil with a boiling point of 274 C (525 F). Sesquiterpenes are colorless, viscous liquids or fusible crystalline solids with a boiling point of 230300C and with a weaker but more persistent odor. PDF P-ISSN: 2349 Role of secondary metabolites in plant defense against 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. Rosin is the nonvolatile portion of the oleoresin of members of the pine family and is the residue left after the isolation of turpentine. Ce sont des composants majeurs de la rsine et de l'essence de trbenthine produite partir de rsine. One of a class of hydrocarbons with an empiric formula of C 10 H 16, occurring in essential oils and resins. The vulcanization of rubber involves the establishment of cross-linking between the chains through sulfur atoms. polyterpene - Wiktionary Seulement, ceux-ci ont t qualifis l'origine de terpne, terme qui est devenu une notion spcifie plus tard plus prcisment. Originally, plants developed terpenes for evolutionary purposes. The terpenoids, also known as isoprenoids, are a class of naturally occurring organic chemicals derived from the 5-carbon compound isoprene and its derivatives called terpenes, diterpenes, etc. Treatment of -pinene with acids under various conditions leads to a host of products, among which are terpinolene, the terpinenes, -terpineol, and terpin, previously mentioned, as well as borneol, fenchyl alcohol, and the hydrocarbon camphene. Gutta-percha and natural rubber may be regarded as polyterpenes. terpene. 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. For example, the odor of ginger results from the presence of the sesquiterpene hydrocarbon zingiberene, and the smell of linden, from the presence of the sesquiterpene alcohol farnesol. 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, . patents-wipo To save this word, you'll need to log in. Updates? : 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 Terpene monomers are a by-product in the extraction of rosin from wood stumps or tree sap, and from the extraction of oils from citrus fruits. terpene, any of a class of hydrocarbons occurring widely in plants and animals and empirically regarded as built up from isoprene, a hydrocarbon consisting of five carbon atoms attached to eight hydrogen atoms (C 5 H 8 ). , bandel (Indonesian), (Telugu). polyterpenes: ( pol'-ter'pnz ), Acyclic polymers containing a large number of isoprene subunits, usually unsaturated. isoprenoid: Structural classification of isoprenoids. It is among the cheapest organic acids. . En revanche, l'isoprne est facilement obtenu par dgradation des terpnes. Certain tetraterpenoids, such as carotene and xanthophylls, are plant pigments. Terpenes belong to a broad class of natural compounds, the isoprenoids. The carotenoids are isolated from their natural sources by solvent extraction and are purified by chromatography. from Wiktionary, Creative Commons Attribution/Share-Alike License. This paper will provide references for further exploring the molecular regulation and improving the content of terpenoids in plants. terpenes - International Union of Pure and Applied Chemistry Start your free trial today and get unlimited access to America's largest dictionary, with: Polyterpene. Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/polyterpene. The definition of polyterpenes in Dictionary is as: plural of polyterpene. Search polyterpenes and thousands of other words in English definition and synonym dictionary from Reverso. Polyterpenes is one of the first classes of non-polar tack-ifiers to be developed. They are purified by vacuum fractional distillation or by chromatography. terpnes) (organic chemistry) terpene Derived words . Rubber, which occurs in the latex of the rubber tree, is a polyterpene hydrocarbon, (C5H8)n, in which n is 4,0005,000. Corrections? Details can be found in the individual articles. Learn the definition of 'polyterpenes'. polyterpenes Definition - English Dictionary | polyterpenes The triterpene squalene is found in shark liver. The acyclic terpenes, such as myrcene, have an open chain of carbon atoms; the cyclic terpenesfor example, limonene, camphene, and pinenescontain one or more nonaromatic rings. Terpenes are found in almost all plant tissuesthey are contained in essential oils, turpentine, resins, and balsams. Omissions? The sesquiterpenes demonstrate an even greater complexity of structure than the monoterpenes, and oxygenated sesquiterpenes are commonly encountered. Learn the definition of 'polyterpene'. Les terpnes sont des mtabolites secondaires qui se rencontrent galement chez les mtazoaires (phromones et hormones sesquiterpniques des hexapodes, diterpnes d'organismes aquatiques (cnidaires, ponges)). -Selinene, present in celery oil, is typical of the eudalene type. Wiktionary Advertisement Other Word Forms of Polyterpene Noun Singular: polyterpene Plural: polyterpenes Find Similar Words Find similar words to polyterpene using the buttons below. En fonction du nombre n (entier) d'units pentacarbones (en C5) ramifies, on peut distinguer pour: Des matires aussi diverses que le caoutchouc, la vitamine A1 ou le cholestrol sont construits essentiellement de briques isoprniques. Division into isoprene units is. The reverse transition is effected under more rigorous conditions. Entries where "polyterpne" occurs: polyterpene: see also polyterpne polyterpene (English) Noun polyterpene (pl. Monoterpenes are colorless liquids with a characteristic odor and a boiling point of 150190C. Definition from Wiktionary, the free dictionary polyterpene (CHEBI:51960) - EMBL-EBI en.wiktionary.2016 While sometimes used interchangeably with "terpenes", terpenoids contain additional functional groups, usually containing oxygen. 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, . Add your entry in the Collaborative Dictionary. noun chemistry any polymeric terpene formed from many isoprene units joined head to tail; includes rubber and gutta-percha Etymologies Sorry, no etymologies found. Polyterpene Definition & Meaning - Merriam-Webster Terpenes ( / trpin /) are a class of natural products consisting of compounds with the formula (C 5 H 8) n for n 2. Here, we provide an overview on the synthesis and metabolic pathways, regulatory pathways, and key enzymes in the biosynthetic pathways of terpenoids. Comprising more than 30,000 compounds, these unsaturated hydrocarbons are produced predominantly by plants, particularly conifers. 2, More than 250,000 words that aren't in our free dictionary, Expanded definitions, etymologies, and usage notes. Noun polyterpnes (?) 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. Polyterpenoid | definition of Polyterpenoid by Medical dictionary When 'thingamajig' and 'thingamabob' just won't do, A simple way to keep them apart. 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. La dernire modification de cette page a t faite le 5 mai 2023 07:32. A nonpolar hydrocarbon resin or a polyterpene resin is particularly used as the tackifier for the adhesive compound (s). Its use in coating materials depends on its properties as a solvent and on its conversion by oxidation into a polymeric resinous film. polyterpne (French): meaning, translation - WordSense Because they are of lower volatility than the monoterpenes, sesquiterpenes, C15H24, are isolated from their natural sources by distillation with steam or by extraction. Acyclic monoterpene hydrocarbons are few in number, but their oxygenated derivatives are more widespread in nature and of greater importance. 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. WordSense Dictionary: polyterpenes - spelling, hyphenation, synonyms, translations, meanings & definitions. Terpenes are also used to prepare lubricants, flotation oil, immersion fluids, and such insecticides as polychloropinene and polychlorocamphene. 0.3761 [[eta].sub.inh] + 0.15,: (i) where cotan [delta] is the cotangent of the loss angle of a sample of said, Blends containing very high 1,2, contents had extremely broad Tgs much closer to the, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Tire comprising elastomeric mixtures with a low level of sulfur, Fourier transform infrared spectral analysis of polyisoprene of a different microstructure, Process development of iron catalyzed 3,4 polyisoprene, Synthetic branched polyisoprenes and process for obtaining them, Savannah hosts Rubber Division. Certaines informations figurant dans cet article ou cette section devraient tre mieux relies aux sources mentionnes dans les sections Bibliographie, Sources ou Liens externes (aot 2020). Learn a new word every day. Dfinitions : polyterpne - Dictionnaire de franais Larousse Terpenes composed of 5-C synthesized primarily from products of the shikimic acid pathway, have several important defensive role in the plants. Citral, which is extracted from certain essential oils, is also obtained by the oxidation of linalool and is synthesized in considerable quantities from isoprene, acetone, and acetylene. Phytol, an oxygenated acyclic diterpene, is an important building block of the chlorophyll molecule, from which it is obtained on treatment with alkali solution. Petroleum resins, coumarone-indene resins. The commercial importance of the bicyclic monoterpene -pinene is paralleled in the diterpenes by abietic acid, a tricyclic carboxylic acid that constitutes the major portion of rosin. Post the Definition of polyterpene to Facebook, Share the Definition of polyterpene on Twitter, Palter, Dissemble, and Other Words for Lying, Skunk, Bayou, and Other Words with Native American Origins, Words For Things You Didn't Know Have Names, Vol. . Les terpnes ont deux proprits fondamentales: Les terpnes ont t nomms en 1863 par le chimiste allemand Kekul en rfrence la trbenthine qui, en plus des acides rsiniques, contient aussi des hydrocarbures (trbenthine se dit en allemand Terpentin)[1]. Polyterpene Definition & Meaning | YourDictionary Definitions from The Century Dictionary. Polyterpenes are typically synthesized by cationic polymerization using a suitable solvent and Lewis acid catalyst. 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. 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.

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