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Germacrene D
Germacrenes are a group of five naturally occurring volatile organic hydrocarbons of the sesquiterpene and cycloalkene class. Germacrenes are typically produced in a number of plant species for their antimicrobial and insecticidal properties, though they also play a role as insect pheromones. Two prominent molecules are germacrene A and germacrene D. Structures Germacrene has five isomers. Natural occurrences The essential oils of deadnettles (genus ''Lamium''), hedgenettles (genus ''Stachys''), and ''Clausena anisata :''Should not be confused with syzygium anisatum, a tree native to eastern Australian rainforests, used as a culinary herb.'' ''Clausena anisata'' ( Willd.) Hook.f. ex Benth. is a deciduous shrub or small tree, belonging to the Rutaceae or Cit ...'' are characterized by their high contents of germacrene D. Germacrene B is a major component of patchouli oil. References Further reading General * Germacrene A * * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrocarbon
In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons are examples of group 14 hydrides. Hydrocarbons are generally colourless and Hydrophobe, hydrophobic; their odor is usually faint, and may be similar to that of gasoline or Naphtha, lighter fluid. They occur in a diverse range of molecular structures and phases: they can be gases (such as methane and propane), liquids (such as hexane and benzene), low melting solids (such as paraffin wax and naphthalene) or polymers (such as polyethylene and polystyrene). In the fossil fuel industries, ''hydrocarbon'' refers to naturally occurring petroleum, natural gas and coal, or their hydrocarbon derivatives and purified forms. Combustion of hydrocarbons is the main source of the world's energy. Petroleum is the dominant raw-material source for organic commodity chemicals such as solvents and polymers. Most anthropogenic (human-generated) emissions of greenhouse gases are eithe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamium
''Lamium'' (dead-nettles) is a genus of about 30 species of flowering plants in the family Lamiaceae, of which it is the type genus. They are all herbaceous plants native to Eurasia and northern Africa, with several widely naturalised across much of the temperate world. Description The genus includes both annual and perennial species; they spread by both seeds and stems rooting as they grow along the ground. They have square stems and coarsely textured pairs of leaves, often with striking patterns or variegation. They produce double-lipped flowers in a wide range of colours. Taxonomy In volume 2 of ''Species Plantarum'' published in 1753, the Swedish botanist Carl Linnaeus established genus ''Lamium'' by recognizing four species: ''Lamium album'', ''Lamium purpureum'', ''Lamium amplexicaule'', and ''Lamium multifidum''. The name ''Lamium'' is the primary generic name in use today. , Plants of the World Online accepts the following species: * '' Lamium album'' L. – (w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sesquiterpenes
Sesquiterpenes are a class of terpenes that consist of three isoprene units and often have the molecular formula C15H24. Like monoterpenes, sesquiterpenes may be cyclic or contain rings, including many combinations. Biochemical modifications such as oxidation or rearrangement produce the related sesquiterpenoids. It is estimated (2006) that 3000 sesquiterpenes have been identified. Biosynthesis and examples The reaction of geranyl pyrophosphate with isopentenyl pyrophosphate results in the 15-carbon farnesyl pyrophosphate (FPP), which is an intermediate in the biosynthesis of sesquiterpenes such as farnesene. Cyclic sesquiterpenes are more common than cyclic monoterpenes because of the increased chain length and additional double bond in the sesquiterpene precursors. In addition to common six-membered ring systems such as the ones found in zingiberene and bisacurone, cyclization of one end of the chain to the other end can lead to macrocyclic rings such as humulene. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkene Derivatives
In organic chemistry, an alkene, or olefin, is a hydrocarbon containing a carbon–carbon double bond. The double bond may be internal or at the terminal position. Terminal alkenes are also known as α-olefins. The International Union of Pure and Applied Chemistry (IUPAC) recommends using the name "alkene" only for acyclic hydrocarbons with just one double bond; alkadiene, alkatriene, etc., or polyene for acyclic hydrocarbons with two or more double bonds; cycloalkene, cycloalkadiene, etc. for cyclic ones; and "olefin" for the general class – cyclic or acyclic, with one or more double bonds. Acyclic alkenes, with only one double bond and no other functional groups (also known as mono-enes) form a homologous series of hydrocarbons with the general formula with ''n'' being a >1 natural number (which is two hydrogens less than the corresponding alkane). When ''n'' is four or more, isomers are possible, distinguished by the position and conformation of the double bond. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angelica Glauca
''Angelica glauca'', also known as Himalayan angelica, is a species of flowering plant in the family Apiaceae. It is found from eastern Afghanistan through the western Himalayas to western Tibet. It is noted for its medicinal and aromatic properties. Angelica glauca grows mainly in high-altitude areas and is cultivated for its value in traditional medicine, especially its roots and essential oil. Collecting in the wild for its essential oil has driven this species to endangered status. Description Angelica glauca is a large, sturdy, tall herbaceous plant that can reach a height of 1–2 meters. The stems are hollow and the plant flowers in clusters, with small white, yellow, or purple flowers arranged in an umbel, typical of the Apiaceae family. The roots are aromatic and succulent; and are commonly used medicinally for their anti-inflammatory, digestive, fever, headache, mental disorders, and respiratory properties. The plant is often recognized by its large size, distinctive f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patchouli
Patchouli (also spelled patchouly or pachouli; ; '' Pogostemon cablin'') is a species of flowering plant in the family Lamiaceae, commonly called the mint or deadnettle family. The plant grows as a bushy perennial herb, with erect stems reaching up to in height and bearing small, pale, pink-white flowers. It is native to the island region of Southeast Asia, including Sri Lanka, Indonesia, the Malay Peninsula, New Guinea, and the Philippines. It is also found in many parts of Nepal and North East India. Noted for its fragrant essential oil, it has many commercial uses and is now extensively cultivated in tropical climates around the world, especially in Asia, Madagascar, South America, and the Caribbean. , global demand for patchouli oil is over per year, of which over 90% is produced by Indonesia. Etymology The word derives from the Tamil ''patchai'' () or paccuḷi, meaning "green", and ''ellai'' (), meaning "leaf". Cultivation Patchouli grows well in warm to tropical clim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clausena Anisata
:''Should not be confused with syzygium anisatum, a tree native to eastern Australian rainforests, used as a culinary herb.'' ''Clausena anisata'' ( Willd.) Hook.f. ex Benth. is a deciduous shrub or small tree, belonging to the Rutaceae or Citrus family, and widespread in the Afrotropical realm or Sub-Saharan Africa, but absent from the drier regions. It is also found in tropical and South-East Asia, growing in India and Sri Lanka and extending as far as Queensland in north-eastern Australia and some Pacific islands. It is cultivated in Malaysia and Indonesia. As with other plants useful to mankind its large range of medicinal properties has led to a global distribution and its growth wherever the climate is suitable. It grows in higher-rainfall regions in savanna, thickets, riverine forest, disturbed areas and secondary forest, up to an altitude of 3000 m. The leaves, which are foetid when bruised, give rise to the common name 'Horsewood' or the more descriptive Afrikaans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stachys Byzantina
''Stachys byzantina'' (syn. ''S. lanata''), the lamb's-ear (lamb's ear) or woolly hedgenettle, is a species of flowering plant in the mint family (botany), family Lamiaceae, native to Armenia, Iran, and Turkey.Euro+Med Plantbase''Stachys byzantina''/ref>Huxley, A., ed. (1992). ''New RHS Dictionary of Gardening''. Macmillan . It is cultivated throughout much of the temperate world as an ornamental plant, and is naturalisation (biology), naturalised in some locations as an escapee from gardens. Plants are very often found under the synonym ''Stachys lanata'' or ''Stachys olympica''. Lamb's-ear flowers in late spring and early summer; plants produce tall spike-like stems with a few reduced leaves. The flowers are small and light purple. The plants tend to be evergreen but can "die back” during cold winters and regenerate new growth from the crowns. Description Lamb's-ears are herbaceous perennial plant, perennials, usually densely covered with gray or silver-white, silky-lanate h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stachys
''Stachys'' is a genus of plants, one of the largest in the mint family Lamiaceae.Harley, R. M., et al. 2004. "Labiatae". pages 167–275. In: Kubitzki, K. (editor) and J. W. Kadereit (volume editor). ''The Families and Genera of Vascular Plants'' volume VII. Springer-Verlag: Berlin; Heidelberg, Germany. Estimates of the number of species vary from about 300, to about 450.Mabberley, D. J. 2008. ''Mabberley's Plant-Book'' third edition (2008). Cambridge University Press: UK. ''Stachys'' is in the subfamily Lamioideae and its type species is ''Stachys sylvatica''.''Stachys'' In: Index Nominum Genericorum. In: Regnum Vegetabile (see ''External links'' below). The precise extent of the genus and its relationship to other genera in the subfamily are poorly known. Range and naming The Range (biology), distribution of the genus covers Europe, Asia, Africa, Australasia and North America. Common names include hedgenettle, heal-all, self-heal, woundwort, betony, and lamb's ears. Stachys o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamium
''Lamium'' (dead-nettles) is a genus of about 30 species of flowering plants in the family Lamiaceae, of which it is the type genus. They are all herbaceous plants native to Eurasia and northern Africa, with several widely naturalised across much of the temperate world. Description The genus includes both annual and perennial species; they spread by both seeds and stems rooting as they grow along the ground. They have square stems and coarsely textured pairs of leaves, often with striking patterns or variegation. They produce double-lipped flowers in a wide range of colours. Taxonomy In volume 2 of ''Species Plantarum'' published in 1753, the Swedish botanist Carl Linnaeus established genus ''Lamium'' by recognizing four species: ''Lamium album'', ''Lamium purpureum'', ''Lamium amplexicaule'', and ''Lamium multifidum''. The name ''Lamium'' is the primary generic name in use today. , Plants of the World Online accepts the following species: * '' Lamium album'' L. – (w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sesquiterpene
Sesquiterpenes are a class of terpenes that consist of three isoprene units and often have the molecular formula C15H24. Like monoterpenes, sesquiterpenes may be cyclic or contain rings, including many combinations. Biochemical modifications such as oxidation or rearrangement produce the related sesquiterpenoids. It is estimated (2006) that 3000 sesquiterpenes have been identified. Biosynthesis and examples The reaction of geranyl pyrophosphate with isopentenyl pyrophosphate results in the 15-carbon farnesyl pyrophosphate (FPP), which is an intermediate in the biosynthesis of sesquiterpenes such as farnesene. Cyclic sesquiterpenes are more common than cyclic monoterpenes because of the increased chain length and additional double bond in the sesquiterpene precursors. In addition to common six-membered ring systems such as the ones found in zingiberene and bisacurone, cyclization of one end of the chain to the other end can lead to macrocyclic rings such as humulene. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Germacrene E Chemical Structure
Germacrenes are a group of five naturally occurring volatile organic hydrocarbons of the sesquiterpene and cycloalkene class. Germacrenes are typically produced in a number of plant species for their antimicrobial and insecticidal properties, though they also play a role as insect pheromones. Two prominent molecules are germacrene A and germacrene D. Structures Germacrene has five isomers. Natural occurrences The essential oils of deadnettles (genus ''Lamium''), hedgenettles (genus ''Stachys''), and ''Clausena anisata :''Should not be confused with syzygium anisatum, a tree native to eastern Australian rainforests, used as a culinary herb.'' ''Clausena anisata'' ( Willd.) Hook.f. ex Benth. is a deciduous shrub or small tree, belonging to the Rutaceae or Cit ...'' are characterized by their high contents of germacrene D. Germacrene B is a major component of patchouli oil. References Further reading General * Germacrene A * * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
