anhydride

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anhydride

anhydride [Gr.,=without water], chemical compound formed by removing water, H ₂ O, from another compound; the anhydride can also react with water to form the original compound. An acid anhydride reacts with water to form an acid; e.g., sulfur trioxide, SO ₃ , reacts with water to form sulfuric acid, H ₂ SO ₄ . A basic anhydride reacts with water to form a base; e.g., calcium oxide, CaO, reacts with water to form calcium hydroxide, Ca(OH) ₂ . Anhydrides of organic acids have many uses. They react with alcohols to form esters; e.g., acetic anhydride, (CH ₃ CO) ₂ O, reacts with ethanol, C ₂ H ₅ OH, to form ethyl acetate, CH ₃ COOC ₂ H ₅ , a useful solvent. They also react with ammonia and primary or secondary amines to form amides. Other important acid anhydrides include maleic anhydride and phthalic anhydride.

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creatinine

A Dictionary of Food and Nutrition | 2005 | | Â© A Dictionary of Food and Nutrition 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

creatinine Formed non‐enzymically from creatine (chemically the anhydride of creatine). Urinary excretion of creatinine is relatively constant from day to day, and reflects mainly the amount of muscle tissue in the body. Therefore the amounts of various components of urine are often expressed relative to creatinine.

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DAVID A. BENDER. "creatinine." A Dictionary of Food and Nutrition. 2005. Encyclopedia.com. 21 Dec. 2009 <http://www.encyclopedia.com>.

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The Columbia Encyclopedia, Sixth Edition entry for acid anhydride

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Free newspaper and magazine articles

	Maleic Anhydride.(production in China)(Brief Article)(Statistical Data Included) Magazine article from: China Chemical Reporter; 10/26/2001
	Phthalic anhydride stable in 2003. (Analysis). Magazine article from: China Chemical Reporter; 3/26/2003
	Phthalic anhydride: importation decreases in 2002 demand growth depends on PVC. (Market Report).(Production cost, price of phthalic anhydride increases in China)(International Pages)(Brief Article)(Statistical Data Included) Magazine article from: China Chemical Reporter; 6/16/2002

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	Maleic Anhydride.(production in China)(Brief Article)(Statistical Data Included) Magazine article from: China Chemical Reporter; 10/26/2001; 700+ words ; Producers Use Outmoded Process Gain High Growth Rate of Production Maleic anhydride has become the third biggest acid anhydride only next to phthalic anhydride and acetic anhydride and its application sector is constantly expanding. Since...
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