Biomaterial Database

Gas chromatographic resolution of polyunsaturated wax esters based on their degree of unsaturation on Silar 10C. 1977

T Takagi, and Y Itabashi

Wax esters of C28-C44 chain-lengths, and containing 0-7 double bonds, were characterized with equivalent chain lengths [ECL] obtained by GC using a cyanosiloxane, Silar 10C. The ECL of the unsaturated wax esters is significantly dependent upon the column temperature, and selection of an appropriate column temperature permitted adequate resolution of critical pairs differing in the degree of unsaturation or the position of the double bonds.

UI	MeSH Term	Description	Entries
D011090	Polyenes	Hydrocarbons with more than one double bond. They are a reduced form of POLYYNES.	Cumulenes
D002849	Chromatography, Gas	Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types are gas-solid chromatography, where the fixed phase is a solid, and gas-liquid, in which the stationary phase is a nonvolatile liquid supported on an inert solid matrix.	Chromatography, Gas-Liquid,Gas Chromatography,Chromatographies, Gas,Chromatographies, Gas-Liquid,Chromatography, Gas Liquid,Gas Chromatographies,Gas-Liquid Chromatographies,Gas-Liquid Chromatography
D004952	Esters	Compounds derived from organic or inorganic acids in which at least one hydroxyl group is replaced by an –O-alkyl or another organic group. They can be represented by the structure formula RCOOR’ and are usually formed by the reaction between an acid and an alcohol with elimination of water.	Ester
D005231	Fatty Acids, Unsaturated	FATTY ACIDS in which the carbon chain contains one or more double or triple carbon-carbon bonds.	Fatty Acids, Polyunsaturated,Polyunsaturated Fatty Acid,Unsaturated Fatty Acid,Polyunsaturated Fatty Acids,Acid, Polyunsaturated Fatty,Acid, Unsaturated Fatty,Acids, Polyunsaturated Fatty,Acids, Unsaturated Fatty,Fatty Acid, Polyunsaturated,Fatty Acid, Unsaturated,Unsaturated Fatty Acids
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D012833	Siloxanes	Silicon polymers that contain alternate silicon and oxygen atoms in linear or cyclic molecular structures.	Polysiloxane,Polysiloxanes,Siloxane
D013696	Temperature	The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.	Temperatures
D014885	Waxes	A plastic substance deposited by insects or obtained from plants. Waxes are esters of various fatty acids with higher, usually monohydric alcohols. The wax of pharmacy is principally yellow wax (beeswax), the material of which honeycomb is made. It consists chiefly of cerotic acid and myricin and is used in making ointments, cerates, etc. (Dorland, 27th ed)
D014907	Whales	Large marine mammals of the order CETACEA. In the past, they were commercially valued for whale oil, for their flesh as human food and in ANIMAL FEED and FERTILIZERS, and for baleen. Today, there is a moratorium on most commercial whaling, as all species are either listed as endangered or threatened.	Beaked Whales,Berardius,Caperea,Dwarf Sperm Whale,Giant Bottle-Nosed Whales,Goose-Beaked Whale,Gray Whale,Mesoplodon,Narwhals,Pygmy Right Whale,Pygmy Sperm Whale,Right Whale, North Atlantic,Right Whale, Southern,Ziphiidae,Ziphius,Eschrichtius robustus,Eubalaena australis,Grey Whale,Monodon monoceros,North Atlantic Right Whale,Beaked Whale,Bottle-Nosed Whale, Giant,Bottle-Nosed Whales, Giant,Dwarf Sperm Whales,Giant Bottle Nosed Whales,Giant Bottle-Nosed Whale,Goose Beaked Whale,Goose-Beaked Whales,Gray Whales,Grey Whales,Narwhal,Pygmy Right Whales,Pygmy Sperm Whales,Right Whale, Pygmy,Right Whales, Pygmy,Right Whales, Southern,Southern Right Whale,Southern Right Whales,Sperm Whale, Dwarf,Sperm Whale, Pygmy,Sperm Whales, Dwarf,Sperm Whales, Pygmy,Whale,Whale, Grey,Whale, Southern Right,Whales, Grey,Whales, Southern Right