| 释义 |
carnitineenUK
car·ni·tine C0118700 (kär′nĭ-tēn′)n. A compound that functions in fatty acid metabolism by transporting fatty acids into mitochondria for energy production. It is naturally produced in the body and is present in many animal products, especially red meat. It is also sold as a dietary supplement for its purported health benefits.
[German Karnitin, from Karnin, a basic substance derived from meat, from Latin carō, carn-, flesh; see carnal.]carnitine (ˈkɑːnɪˌtaɪn) na white betaine, C7H15NO3, found in the liver and required for transporting fatty acids from the cytosol into the mitochondriaTranslationsCarnitineenUK
carnitine[′kär·nə‚tēn] (biochemistry) C7H15NO3α-Amino-β-hydroxybutyric acid trimethylbetaine; a constituent of striated muscle and liver, identical with vitamin B T. Carnitine betaine-γ-amino-β-oxybutyric acid, (CH3)3NCH2CH(OH)CH2CO2−, a crystalline compound with basic properties; dissolves readily in water and alcohol. Its molecular mass is 161.21, and its melting point, 195°-197°C (with decomposition). Carnitine is primarily found in animal muscle, from which it was first extracted by V. S. Gulevich (1905); it is also found in bacteria and plants. It takes part in fatty exchange within an organism by acting as a carrier of fatty acid radicals through the membranes of the mitochondria. These membranes are impermeable to activated fatty acids (compounds with coenzyme A). With the aid of carnitine, therefore, fatty acids enter the scope of activity of the oxidizing enzymes localized within the mitochondria. Carnitine apparently also participates in the reverse transport of fatty acids. It is an essential dietary constituent and a growth factor in certain insects; therefore it is considered to be a vitamin (vitamin BT). carnitineenUK
carnitine [kahr´nĭ-tēn] a derivative of betaine found in skeletal muscle and liver; it is necessary for the mitochondrial oxidation of fatty acids.car·ni·tine (kar'ni-tēn), A trimethylammonium (betaine) derivative of γ-amino-β-hydroxybutyrate, formed from Nε,Nε,Nε-trimethyllysine and from γ-butyrobetaine; the l-isomer is a thyroid inhibitor found in muscle, liver, and meat extract; l-carnitine is an acyl carrier with respect to the mitochondrial membrane and thus stimulates fatty acid oxidation. Synonym(s): BT factor, vitamin BT [L. caro carn-, flesh + ine] carnitine (kär′nĭ-tēn′)n. A compound that functions in fatty acid metabolism by transporting fatty acids into mitochondria for energy production. It is naturally produced in the body and is present in many animal products, especially red meat. It is also sold as a dietary supplement for its purported health benefits.carnitine Chemistry
An essential amino acid that transports long-chain fatty acids across the inner mitochondrial membrane for breakdown to CO2 or ketone bodies; it acts as an acyl (fatty acid carrier). Carnitine is endogenous (synthesised in the liver and kidneys from lysine and methionine) or exogenous (from red meat and dairy products).
Fringe nutrition
Carnitine allegedly enhances athletic performance, prevents heart disease, controls weight and has anti-ageing properties; current data does not support these assertions.car·ni·tine (kahr'ni-tēn) A trimethylammonium (betaine) derivative of gamma-amino-beta-hydroxybutyric acid, formed from NE,NE,NE -trimethyllsine and from gamma-butyrobetaine; the l-isomer is a thyroid inhibitor found in muscle, liver, and meat extracts; l-carnitine is an acyl carrier with respect to the mitochondrial membrane; it thus stimulates fatty acid oxidation. [G. karnin, an alkali derived from meat]car·ni·tine (kahr'ni-tēn) Compound found in dairy and meat that stimulates fatty acid oxidation. [G. karnin, an alkali derived from meat] |