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Conversion of an optically active substance to a racemic form.


(ˌræs ə məˈzeɪ ʃən, reɪˈsi mə-, rə-)

the conversion of an optically active substance into an optically inactive mixture of equal amounts of the dextrorotatory and levorotatory forms.
References in periodicals archive ?
Subsequently, many scholars use dentin translucency, cementum ring structure, amino acid racemization, and modified Gustafson method for age estimation (Singh et al.
glycation end-products (AGEs), (4) aspartic acid racemization (AAR), and
Age and growth estimates of Bowhead Whales (Balaena mysticetus) via aspartic acid racemization.
Age estimates based on aspartic acid racemization for bowhead whales (Balaena mysticetus) harvested in 1998-2000 and the relationship between racemization rate and body temperature.
This 23-chapter book explores mechanisms linking aging, disease, and biological age estimation, focusing on four of the hallmarks of aging--aspartic acid racemization, advanced glycation endproducts, telomere shortening, and mitochondrial DNA mutations--and their role in aging and diseases and their application in age-at-death estimation in forensic sciences.
Notably, the CTX octapeptide also contains an aspartyl that gradually undergoes isomerization and racemization, converting from the newly synthesized form ([alpha]CTX) to an isomerized form ([beta]CTX) over time.
In the presence of base racemization also occur which also preferentially leads to the reduction of yield and makes purification difficult.
Thus, no detectable racemization took place under the conditions of the Pd-catalyzed vinylation.
This racemization usually comes about as a result of faulty manufacturing procedures, such as at the point that laetrile was extracted from its source in apricot kernels in a substandard factory.
Aspartic acid racemization in tooth enamel from living humans.
In the samples prepared with a tin(II) 2-ethylhexanoate as the catalyst, racemization can occur during polymerization, which strongly influences stereoregularity of poly(L-lactide), even with the isosorbide in the main chains.
Zinc(II) N2S2 Schiff-base complexes incorporating pyrazole: syntheses, characterization, tautomeric equilibria and racemization kinetics, J.