| 词汇 | ester |
| 释义 | ester noun[ C ] chemistry specializeduk /ˈes.tər/ us /ˈes.tɚ/ a chemical compound produced by a reaction between an acid and an alcohol, in which the hydrogen of the acid has been replaced by an alkyl group of atoms : 酯 Simple organic substances such as esters, ketones and acids can be converted to hydrocarbon fuels. Esters can have quite a powerful sweet smell. Nitroglycerine is the nitrate ester of glycerol. The soy compound, a sterol ester, is a plant-based compound used in margarines. Cooking oil can be broken down into glycerine and methyl esters, the chemical name for biodiesel, which can fuel a diesel engine. Lanolin is a mixture of esters of cholesterol with stearic, palmitic, and oleic acids. Chemistry: types of chemical acid salt aerogel albumin alkali metal alkaline alkaloid antioxidant carbohydrate inorganic isopropanol ketone lectin melamine methyl orange monosaccharide mothball propellant saline soluble sulphide These esters of the fatty acids give the characteristic savor to many of our favorite fruits, candies and beverages. ester | American Dictionaryester noun[ C ] us/ˈes·tər/ chemistry any of several substances produced by a reaction between an acid and an alcohol Examples of esterester The tissue was dried by grinding with anhydrous sodium sulfate and extracted with several volumes of hexane to remove carotenoids, retinols, and retinyl esters. Lipid hydrolysis was also detected by measuring lipase activity with glycerol ester as substrate. Using a photo fragmentation process that breaks an ester bond we demonstrate the system's ability to produce simple lipids (carboxyl acid). The next system on the energy scale is an amide ester. Synthetic standard benzyl esters were prepared via the tetrabutylammonium salts on a preparative scale. Phorbol esters stimulate macropinocytosis and solute flow through macrophages. This gives the best resolution of methyl esters. Isoform-specific tissue distribution and differential processing in response to phorbol ester. Raven determined that the platform could be redesigned as a flat panel in a vinyl ester carbon composite. Arachidonic acid is a common constituent of phospholipids in all membranes within a cell, cholesteryl esters and triglycerides. The characterization of such minority modified gangliosides is complicated by the alkali lability of the ester group. Colocalization of 11-cis retinyl esters and retinyl ester hydrolase activity in retinal pigment epithelium plasma membrane. However, an analysis of pectin and pectin methyl esters in developing and maturing soybean seeds has not been reported. The internal standard was calibrated against these and amounts of benzyl esters converted to amounts of acids trapped. In addition, studies have shown that diterpenes and sugar esters produced by glandular trichomes are the main chemicals responsible for aphid resistance in tobacco. See all examples of ester These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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