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Scandenoside
Scandenoside is any one of several chemical compounds isolated from certain plants, notably ''Hemsleya panacis-scandens''. They can be seen as derivatives of the triterpene hydrocarbon cucurbitane (), more specifically from cucurbitacin, cucurbitacin F.Jian Chao Chen, Ming Hua Chiu, Rui Lin Nie, Geoffrey A. Cordell and Samuel X. Qiu (2005), "Cucurbitacins and cucurbitane glycosides: structures and biological activities" ''Natural Product Reports'', volume 22, pages 386-399 They include * Scandenoside R9, from ''Hemsleya panacis-scandens''. References Triterpene glycosides {{organic-compound-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cucurbitacin
Cucurbitacin is a class of biochemical compounds that some plants – notably members of the pumpkin and gourd family, Cucurbitaceae – produce and which function as a defence against herbivores. Cucurbitacins are chemically classified as triterpenes, formally derived from cucurbitane, a triterpene hydrocarbon – specifically, from the unsaturated variant cucurbit-5-ene, or 19(10→9β)-abeo-10α-lanost-5-ene. They often occur as glycosides. They and their derivatives have been found in many plant families (including Brassicaceae, Cucurbitaceae, Scrophulariaceae, Begoniaceae, Elaeocarpaceae, Datiscaceae, Desfontainiaceae, Polemoniaceae, Primulaceae, Rubiaceae, Sterculiaceae, Rosaceae, and Thymelaeaceae), in some mushrooms (including Russula and Hebeloma) and even in some marine mollusks. Cucurbitacins may be a taste deterrent in plants foraged by some animals and in some edible plants preferred by humans, like cucumbers and zucchinis. In laboratory research, cucurbitacins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cucurbitane
Cucurbitane is a class of chemical compounds with formula ( CAS number 65441-59-0). It is a polycyclic hydrocarbon, specifically triterpene. It is also an isomer of lanostane (specifically 19(10→9β)-abeolanostane), from which it differs by the formal shift of a methyl group (carbon number 19) from the 10 to the 9β position in the standard steroid numbering scheme.Satish Kumar and Raj Kumar (1991), ''Dictionary of Biochemistry''. Anmol Publications, India The name is applied to two stereoisomers, distinguished by the prefixes 5α- and 5β-, which differ by the handedness of the bonds at a particular carbon atom (number 5 in the standard steroid numbering scheme). File:5alpha-cucurbitane.svg, 5α-Cucurbitane File:5beta-cucurbitane.svg, 5β-Cucurbitane Derivatives Natural compounds Compounds with the basic cucurbitane skeleton are found in many plants, and some are important phytopharmaceuticals. Natural cucurbitane-related compounds include: Named * Balsaminapentaol, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scandenoside R9
Scandenoside is any one of several chemical compounds isolated from certain plants, notably ''Hemsleya panacis-scandens''. They can be seen as derivatives of the triterpene hydrocarbon cucurbitane (), more specifically from cucurbitacin F Cucurbitacin is a class of biochemistry, biochemical compounds that some plants – notably members of the pumpkin and gourd family, Cucurbitaceae – produce and which function as a defence against herbivores. Cucurbitacins are chemically clas ....Jian Chao Chen, Ming Hua Chiu, Rui Lin Nie, Geoffrey A. Cordell and Samuel X. Qiu (2005), "Cucurbitacins and cucurbitane glycosides: structures and biological activities" ''Natural Product Reports'', volume 22, pages 386-399 They include * Scandenoside R9, from ''Hemsleya panacis-scandens''. References Triterpene glycosides {{organic-compound-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemical Compound
A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound. A compound can be transformed into a different substance by a chemical reaction, which may involve interactions with other substances. In this process, bonds between atoms may be broken and/or new bonds formed. There are four major types of compounds, distinguished by how the constituent atoms are bonded together. Molecular compounds are held together by covalent bonds; ionic compounds are held together by ionic bonds; intermetallic compounds are held together by metallic bonds; coordination complexes are held together by coordinate covalent bonds. Non-stoichiometric compounds form a disputed marginal case. A chemical formula specifies the number of atoms of each element in a compound molecule, using the s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemsleya Panacis-scandens
''Hemsleya'' is a genus of flowering plants belonging to the family Cucurbitaceae. Its native range is Eastern Himalayas to southern China and Papuasia. It is native to the countries of Assam (in India), Bismarck Archipelago (island group, part of Papua New Guinea), China, East Himalayas, Maluku Islands, New Guinea, Thailand and Vietnam. The genus name of ''Hemsleya'' is in honour of William Hemsley (1843–1924), an English botanist. It was first described and published in J. Linn. Soc., Bot. Vol.23 on page 490 in 1888. Knowns species According to Kew: *'' Hemsleya amabilis'' *''Hemsleya carnosiflora'' *'' Hemsleya chengyihana'' *'' Hemsleya chinensis'' *''Hemsleya cirromitrata'' *'' Hemsleya delavayi'' *''Hemsleya dipteriga'' *''Hemsleya dolichocarpa'' *'' Hemsleya dulongjiangensis'' *'' Hemsleya ellipsoidea'' *'' Hemsleya emeiensis'' *''Hemsleya endecaphylla'' *''Hemsleya gigantha'' *''Hemsleya graciliflora'' *''Hemsleya kunmingensis'' *''Hemsleya lijiangen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triterpene
Triterpenes are a class of chemical compounds composed of three terpene units with the molecular formula C30H48; they may also be thought of as consisting of six isoprene units. Animals, plants and fungi all produce triterpenes, including squalene, the precursor to all steroids. Structures Triterpenes exist in a great variety of structures. Nearly 200 different skeletons have been identified. These skeletons may be broadly divided according to the number of rings present. In general pentacyclic structures (5 rings) tend to dominate. Squalene is biosynthesized through the head-to-head condensation of two farnesyl pyrophosphate units. This coupling converts a pair of C15 components into a C30 product. Squalene serves as precursor for the formation of many triterpenoids, including bacterial hopanoids and eukaryotic sterols. Triterpenoids By definition triterpenoids are triterpenes that possess heteroatoms, usually oxygen. The terms ''triterpene'' and ''triterpenoid'' oft ... [...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 hydrophobic, and their odors are usually weak or exemplified by the odors of gasoline and 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 the naturally occurring petroleum, natural gas and coal, and to 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 carbon di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
