racemic

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Related to Racemic mixture: chirality, racemic epinephrine, Diastereomers

racemic

 [ra-se´mik]
optically inactive, being composed of equal amounts of dextrorotatory and levorotatory isomers.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ra·ce·mic (r),

(rā-sē'mik, -sem'ik),
Denoting a mixture of optically active compounds that is itself optically inactive, being composed of an equal number of dextro- and levorotatory substances, which are separable. Those compounds chracterized by two or more chiral centers and internal compensation (for example, an internal line of symmetry), and are therefore not separable into d or l (or + and -) forms, receive the prefix meso-) (for example, meso-cystine).
Farlex Partner Medical Dictionary © Farlex 2012

ra·ce·mic

(rā-sē'mik)
Denoting a mixture of optically active compounds that is itself optically inactive, being composed of an equal number of dextrorotatory and levorotatory substances, which are separable.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ra·ce·mic

(rā-sē'mik)
Denoting mixture of compounds that is itself optically inactive, being composed of an equal number of dextrorotatory and levorotatory substances.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
On the other hand, many pyrethroids are marketed as racemic mixtures, which have in equal enantiomeric proportions.
In this study, chiral separation of 36 racemic mixtures of synthetic cathinone derivatives was carried out: fourteen of them were selected in the spiked mixtures, and each enantiomer was quantitated in urine and plasma as shown in the example of nor-mephedrone in Figure 1.
Apotex, Inc., (80) the court found that the patented dextrorotatory isomer (81) was not obvious in light of the known racemic mixture. (82) Racemates of two other thienopyridines had been resolved, and there was no observed advantage to separation in either case.
(124) This receptorsubstrate affinity is responsible for the physiological differences observed between enantiomers and is one reason why pharmaceutical drugs are often administered as a single enantiomer rather than as a racemic mixture. (125)
Twenty-one of these compounds were isolated, tested, and included in the specification of the genus patent; one of these compounds was the racemic mixture of clopidogrel.
Table 1 Clinical studies of stimulant use in patients with bipolar disorder Stimulant(s) studied Study design Patients studied Traditional stimulants Adjunctive methylphenidate Chart review, 16 adults (5 with naturalistic (12) comorbid ADHD, 11 with bipolar depression) Adjunctive methylphenidate Chart review of 8 adults (BD II) or racemic mixture of AMPH sedation and salts depressive symptoms (13) Adjunctive methylphenidate 12-week open study, 12 adults (10 BDI.
Methadone, a synthetic opioid that is available in the United States as a racemic mixture of two isomers, has several advantages over other opioid analgesics.
Ofloxacin otic contains a lesser amount of active antibiotic because the racemic mixture of ofloxacin contains only 1,500 [micro]g/ml of the active levo isomer; therefore organisms might be considered to be potentially resistant if the MIC is 128 [micro]g/ml.
Warfarin is a racemic mixture of two enantiomers that are metabolised by different inducible isoforms of the cytochrome P450 family.
A racemic mixture is a preparation containing 50% L-thyroxine and 50% D-thyroxine.