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单词 racemization
释义

racemizationn.

Brit. /ˌrasᵻmʌɪˈzeɪʃn/, U.S. /ˌræsəmaɪˈzeɪʃ(ə)n/, /ˌræsəməˈzeɪʃ(ə)n/
Forms: 1800s– racemisation, 1900s– racemization.
Origin: Formed within English, by derivation. Etymons: racemic adj., -ization suffix.
Etymology: < racem- (in racemic adj.) + -ization suffix. Compare French racémisation (1899 or earlier). Compare slightly later racemize v., racemized adj.
Chemistry.
Conversion of an optically active substance into a racemic (and so optically inactive) form.
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the world > matter > chemistry > isomerism > [noun] > stereo-isomerism > optical isomerism > racemism > racemization
racemization1895
1895 A. Eiloart in Sci. Progress 3 503 If the temperature of racemisation2 lies below the ordinary temperature, the difficulty of separating the active isomers is accounted for. [Note] 2This term is used to indicate the formation of the inactive aggregate from two isomers of opposite activity.
1927 Arnall & Hodges Theoret. Org. Chem. II. vi. 59 Pinene and limonene undergo racemisation on simple heating.
1950 R. C. Fuson Adv. Org. Chem. vi. 111 When l-2 iodoöctane is treated with sodium iodide in acetone solution..racemization occurs.
1975 Whig-Standard (Kingston, Ont.) 5 Sept. 7/5 The ages were obtained by the so-called racemization method. This records the extent to which molecules of aspartic acid in a specimen have altered their configuration from the form that occurs in living bones to its mirror image.
1996 New Scientist 18 May 21/2 In 1994, researchers..noted that the rate of amino acid racemisation seems to correlate with the rate of DNA breakdown by depurination.
This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022).
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n.1895
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