Share to: share facebook share twitter share wa share telegram print page

Triterpène

Squalène : un des triterpènes les plus importants
Hopane : un exemple de triterpène pentacyclique

Les triterpènes sont des substances d'origine organique en C30 (30 atomes de carbone) de la famille des terpènes. Très répandus dans la nature, on les trouve notamment dans les résines, à l'état libre, sous forme estérifiée ou hétérosidique.

Ils résultent de la condensation de six molécules d'isoprène. La formule de base d'un triterpène est : C5H8 x 6 = C30H48 . Ce sont des hydrocarbures insaturés[1].

Les stérols (cholestérol,...) sont des dérivés de triterpènes.

Références

  1. (fr) Pierre Boiteau, B. Pasich et Albert Rakoto Ratsimamanga, Les Triterpénoïdes en physiologie végétale et animale, Paris, Éditions Gauthier-Villars, 1964

Liens

Read other articles:

Країни, що приймали ВКЕ, 1905–2016 Всесвітній конгрес есперантистів або, точніше, Всесвітній конгрес есперанто (есп. Universala Kongreso de Esperanto) щорічно проводить Всесвітня Есперанто Асоціація. Це найбільший у світі есперанто-захід, що збирає тисячі есперантистів з усього світу. Як пр

 

Ballon Localidad BallonLocalización de Ballon en IrlandaCoordenadas 52°44′26″N 6°46′04″O / 52.7406, -6.7678Entidad Localidad • País República de Irlanda • Provincia Leinster • Condado Condado de CarlowAltitud   • Media 103 m s. n. m.Huso horario UTC±00:00 Sitio web oficial [editar datos en Wikidata] Ballon es una localidad situada en el condado de Carlow de la provincia de Leinster (República de Irlanda), con una poblac...

 

English priest, art dealer, art collector and painter Portrait of Carr by John Jackson, 1827, now in the National Gallery, London. The Reverend William Holwell Carr, (1758–1830) was an English priest, art dealer, art collector and painter. His bequest of paintings was an important early addition to the collection of the National Gallery in London. Life He was born William Holwell in Exeter, Devon, the son of Edward Holwell, an apothecary, and educated from 1776 at Exeter College, Oxford, wh...

1970 song by Dana For the quiz show hosted by Ryan Tubridy, see All Kinds of Everything (TV series). For the album by Hank Locklin, see All Kinds of Everything (album). All Kinds of EverythingEurovision Song Contest 1970 entryCountryIrelandArtist(s)Dana Rosemary ScallonAsDanaLanguageEnglishComposer(s)Derry Lindsay, Jackie SmithLyricist(s)Derry Lindsay, Jackie SmithConductorDolf van der LindenFinals performanceFinal result1stFinal points32Entry chronology◄ The Wages of Love (1969)One Day Lov...

 

ولاية أفريقيا الإمبراطورية praefectura praetorio Africae ولاية إمبراطورية رومانية 534 – 590 الولاية الإمبراطورية بإيطاليا عام 400 م باللون الأصفر وتظهر ضمنها ولاية أفريقيا. عاصمة قرطاج نظام الحكم ولاية رومانية اللغة الرسمية اللاتينية العامية  اللغة القائمة .. اللغة الرسمية والأساس

 

Der Titel Wissenschaftsstadt wird in Deutschland von den Regierungen der jeweiligen Länder an Städte verliehen, in denen durch national und international tätige Institutionen und Forschungseinrichtungen herausragende Leistungen auf dem Gebiet der Forschung erreicht wurden. Derzeit führen vier deutsche Städte diesen Titel. Inhaltsverzeichnis 1 Wissenschaftsstädte 1.1 Darmstadt 1.2 Fürth 1.3 Straubing 1.4 Burghausen 2 Wissenschaftsstadt als Stadtteil 3 Siehe auch 4 Weblinks 5 Einzelnachw...

أمير المسلمين أبو عبد الله محمد الرابع الثابتي سلطان تلمسان أبو عبد الله محمد الرابع بن أبي عبد الله المتوكل سلطان الدولة الزيانية فترة الحكم1468 (أو 1472) - 1505 أبو تاشفين الثالث أبو عبد الله الخامس معلومات شخصية الوفاة 910 هـ / 1505 متلمسان مواطنة مملكة تلمسان  الديانة الإسلام ا�...

 

Suburb of London Human settlement in EnglandNew MaldenClockwise from top: New Malden High Street with Apex Tower in the background, a Korean supermarket, Cycleway 31 along the Cut, New Malden station and New Malden Town HallNew MaldenLocation within Greater LondonOS grid referenceTQ215685• Charing Cross9.4 mi (15.1 km) NELondon boroughKingstonMertonCeremonial countyGreater LondonRegionLondonCountryEnglandSovereign stateUnited KingdomPost townNEW ...

 

ستانيسلاف غاليتش معلومات شخصية الميلاد 12 مارس 1943 (80 سنة)  بانيا لوكا  مواطنة صربيا  الحياة العملية المهنة عسكري  اللغات الصربية  تهم التهم جريمة ضد الإنسانية  الخدمة العسكرية الفرع جيش  الرتبة فريق أول  تعديل مصدري - تعديل   ستانيسلاف غاليتش (بالصربية: ...

Old Museum BuildingThe Old Museum Building, 2019Former namesExhibition Building and Concert HallGeneral informationAddressCnr Gregory Terrace and Bowen Bridge Road, Bowen Hills, Brisbane, QueenslandCompleted1891OwnerQueensland GovernmentDesign and constructionArchitect(s)George Henry Male Addison The Old Museum Building is a heritage-listed former exhibition building, former museum and now performance venue in Bowen Hills, Brisbane, Queensland, Australia. It is made from 1.3 million red brick...

 

Dismal River cultureGeographical rangeColorado, Kansas, Nebraska, South Dakota.PeriodFormative stageDatesAD 1650-1750Type siteLovitt Site in Dismal River area of NebraskaMajor sitesScott County State Park (Kansas)Preceded byArchaic The Dismal River culture refers to a set of cultural attributes first seen in the Dismal River area of Nebraska in the 1930s by archaeologists William Duncan Strong, Waldo Rudolph Wedel and A. T. Hill. Also known as Dismal River aspect and Dismal River complex, dat...

 

Municipal park in Louisville, Kentucky Chickasaw ParkChickasaw Park's fishing pondTypeMunicipal parkLocationLouisville, KentuckyCoordinates38°14′32″N 85°49′54″W / 38.2423°N 85.8317°W / 38.2423; -85.8317Area61 acres (25 ha)Created1923Operated byMetro Parks Chickasaw Park is a municipal park in Louisville, Kentucky's west end. It is fronted to the west by the Ohio River and by Southwestern Parkway to the east. It was formerly the country estate of p...

Rock band The KuguarsBackground informationOriginBelgrade, Serbia, FR YugoslaviaGenresComedy rockYears active1997–2001LabelsMetropolis RecordsPast membersDragan JovanovićDejan MatićNikola ÐuričkoRade MarkovićBoris MilivojevićBogdan DiklićPapa NickTibor Tot The Kuguars (a transliterated pun for The Cougars) were a successful short-lived Serbian comedy rock band from Belgrade, mainly consisting of famous Serbian actors. Formed in 1997, the band released two albums featuring humorous so...

 

Upazila in Barisal Division, BangladeshZianagarUpazilaIndurkani UpazilaCoordinates: 22°28′50″N 89°57′37″E / 22.4805°N 89.9604°E / 22.4805; 89.9604Country BangladeshDivisionBarisal DivisionDistrictPirojpur DistrictArea • Total94.59 km2 (36.52 sq mi)Population • Total77,217 • Density820/km2 (2,100/sq mi)Time zoneUTC+6 (BST) Indurkani, also known as Zianagar, is an upazila, or sub-district, of the Pi...

 

Armored personnel carrier AMX-13 VCI Mexican AMX-VCI (DNC1)TypeArmored personnel carrierPlace of originFranceService historyWarsTurkish invasion of CyprusIndonesian invasion of East Timor[1]Lebanese Civil WarSouth Lebanon conflict (1985–2000)Cenepa WarMexican drug warSouth Sudanese Civil WarSpecificationsMass15.0 tonnesLength5.7 mWidth2.67 mHeight2.41mCrew3 + 10 passengersArmor10-40mmMainarmamentturret mounted 20mm F2/M693 autocannonSecondaryarmament12.7 mm M2 Browning mac...

Province in Central Luzon, Philippines This article is about the Philippine province. For other uses, see Pampanga (disambiguation). This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Pampanga – news · newspapers · books · scholar · JSTOR (September 2016) (Learn how and when to remove this template message) Pro...

 

Fictional character in the KonoSuba series Fictional character MeguminKonoSuba characterMegumin as seen in promotional artwork for KonoSuba: Fantastic DaysFirst appearanceOh! My Useless Goddess!December 20, 2012Created byNatsume AkatsukiVoiced byRie Takahashi (Japanese)Erica Mendez (English)In-universe informationGenderFemaleOccupationArchwizardSignificant otherKazuma SatouRelativesHyoizaburo (father)Yuiyui (mother)Komekko (sister) Megumin (Japanese: めぐみん) is a fictional character fro...

 

American blues musician Eddy ClearwaterClearwater at the Iron Horse Music Hall, Northampton, Massachusetts, April 20, 2008Background informationBirth nameEdward HarringtonAlso known asGuitar Eddy, Clear Waters, The ChiefBorn(1935-01-10)January 10, 1935Macon, Mississippi, U.S.DiedJune 1, 2018(2018-06-01) (aged 83)Skokie, Illinois, U.S.GenresChicago bluesElectric bluesOccupation(s)Musician, singerInstrument(s)Vocals, electric guitarYears active1953–2018LabelsAlligator, Blind Pig, Rounder...

Diagram showing pressure difference induced by a temperature difference. Thermal transpiration (or thermal diffusion) refers to the thermal force on a gas due to a temperature difference. Thermal transpiration causes a flow of gas in the absence of any other pressure difference, and is able to maintain a certain pressure difference called thermomolecular pressure difference in a steady state. The effect is strongest when the mean free path of the gas molecules is comparable to the dimensions ...

 

Municipal building in Newcastle upon Tyne, Tyne and Wear, England Not to be confused with Newcastle City Hall. Newcastle Town HallThe Town HallLocationNewcastle upon TyneCoordinates54°58′14″N 1°36′44″W / 54.97052°N 1.61221°W / 54.97052; -1.61221Built1863Demolished1973ArchitectJohn JohnstoneArchitectural style(s)Italian neoclassical styleShown in Tyne and Wear The Town Hall was a local government building located in St Nicholas Square, Newcastle upon Tyne. I...

 
Kembali kehalaman sebelumnya