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ester

ester, any one of a group of organic compounds with general formula RCO2R′ (where R and R′ are alkyl groups or aryl groups) that are formed by the reaction between an alcohol and an acid. For example, when ethanol and acetic acid react, ethyl acetate (an ester) and water are formed; the reaction is called esterification. Ethyl acetate is used as a solvent. Methyl acetate, formed by the reaction between methanol and acetic acid, is a sweet-smelling liquid used in making perfumes, extracts, and lacquers. Esters react with water (hydrolysis) under basic conditions to form an alcohol and an acid. When heated with a hydroxide certain esters decompose to yield soap and glycerin; the process is called saponification. Common fats and oils are mixtures of various esters, such as stearin, palmitin, and linolein, formed from the alcohol glycerol and fatty acids. Naturally occurring esters of organic acids in fruits and flowers give them their distinctive odors. Esters perform important functions in the animal body; e.g., the ester acetylcholine is a chemical transmitter of nerve stimuli.

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"ester." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

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"ester." The Columbia Encyclopedia, 6th ed.. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/ester

ester

ester An organic compound formed by esterification. Esters formed from carboxylic acids have the general formula RCOOR′. Esters containing simple hydrocarbon groups are volatile fragrant substances used as flavourings in the food industry. Triesters, molecules containing three ester groups, occur in nature as oils and fats. See also glyceride.

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"ester." A Dictionary of Biology. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

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ester

es·ter / ˈestər/ • n. Chem. an organic compound made by replacing the hydrogen of an acid by an alkyl or other organic group. Many naturally occurring fats and essential oils are esters of fatty acids.

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"ester." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

"ester." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (October 21, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ester-0

"ester." The Oxford Pocket Dictionary of Current English. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ester-0

ester

ester Any of a class of organic compounds formed by reaction between an alcohol and an acid. Water is eliminated in the process. The esterification reaction is the opposite of hydrolysis.

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"ester." World Encyclopedia. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

"ester." World Encyclopedia. . Encyclopedia.com. (October 21, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/ester

"ester." World Encyclopedia. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/ester

ester

ester A compound that is formed as the condensation product (i.e. water is removed) of an acid and an alcohol; water is formed from the OH of the acid and the H of the alcohol.

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"ester." A Dictionary of Ecology. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

"ester." A Dictionary of Ecology. . Encyclopedia.com. (October 21, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ester

"ester." A Dictionary of Ecology. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ester

ester

ester A compound that is formed as the condensation product (i.e. water is removed) of an acid and an alcohol; water is formed from the OH of the acid and the H of the alcohol.

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"ester." A Dictionary of Plant Sciences. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

"ester." A Dictionary of Plant Sciences. . Encyclopedia.com. (October 21, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ester-0

"ester." A Dictionary of Plant Sciences. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/ester-0

ester

esterabetter, begetter, better, bettor, biretta, bruschetta, carburettor (US carburetor), debtor, feta, fetter, forgetter, getter, go-getter, Greta, Henrietta, letter, Loretta, mantelletta, operetta, petter, Quetta, setter, sinfonietta, sweater, upsetter, Valletta, vendetta, whetter •bisector, collector, connector, convector, corrector, defector, deflector, detector, director, ejector, elector, erector, hector, injector, inspector, nectar, objector, perfecter, projector, prospector, protector, rector, reflector, rejector, respecter, sector, selector, Spector, spectre (US specter), vector •belter, delta, helter-skelter, melter, pelta, Shelta, shelter, swelter, welter •pre-emptor, tempter •assenter, cementer, centre (US center), concentre (US concenter), dissenter, enter, eventer, fermenter (US fermentor), fomenter, frequenter, inventor, lamenter, magenta, placenta, polenta, precentor, presenter, preventer, renter, repenter, tenter, tormentor •inceptor, preceptor, receptor, sceptre (US scepter) •arrester, Avesta, Chester, contester, ester, Esther, fester, fiesta, Hester, investor, jester, Leicester, Lester, molester, Nestor, pester, polyester, protester, quester, semester, sequester, siesta, sou'wester, suggester, tester, trimester, vesta, zester •Webster • dexter • Leinster •Dorchester • Poindexter • newsletter •genuflector • implementer •experimenter • trendsetter •epicentre (US epicenter) •typesetter • jobcentre • photosetter •Cirencester • interceptor • Sylvester

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"ester." Oxford Dictionary of Rhymes. . Encyclopedia.com. 21 Oct. 2017 <http://www.encyclopedia.com>.

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"ester." Oxford Dictionary of Rhymes. . Retrieved October 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ester