racemic

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racemic

 [ra-se´mik]
optically inactive, being composed of equal amounts of dextrorotatory and levorotatory isomers.

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).

racemic

/ra·ce·mic/ (ra-se´mik) optically inactive, being composed of equal amounts of dextrorotatory and levorotatory isomers.

racemic

[rāsē′mik]
Etymology: L, racemus, bunch of grapes
pertaining to a compound made up of equal amounts of dextrorotatory and levorotatory isomers, rendering it optically inactive under polarized light.

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.

racemic(rā·sēˑ·mik),

n a combination of both levorotatory and dextrorotatory isomers in an optically active substance. See also dextrorotatory and levorotatory.

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.

racemic (rāsē´mik),

adj referring to a mixture of equal quantities of the dextro- and levo-isomers of a compound.

racemic

optically inactive, being composed of equal amounts of dextrorotatory and levorotatory isomers.
References in periodicals archive ?
453, 453-54 (2009) (describing how the FDAAA allowed enantiomers of previously approved racemic mixtures to get five years of market exclusivity).
For patients with mild asthma using occasional low albuterol doses, the difference between levalbuterol and the racemic mixture may not be clinically relevant.
None of those on low-dose levalbuterol had tremors, compared with 2,7% of those on the equivalent racemic mixture.
As temperature increases, ordinary chemical reactions tend to generate equal proportions of the two isomers, producing so-called racemic mixtures.
8) The resolving of racemic mixtures has also been achieved through the incorporation into the electrolyte of chiral additives, which serve to create mobility differences through diastereomeric interaction with analyte molecules.
It could be used to quantify ratios of enantiomers in racemic mixtures.
In the first section, the isolation of chiral drugs from natural sources, their production in enzymatic processes and the resolution of racemic mixtures in preparative chromatography are outlined in separate chapters.
The latter are racemic mixtures, whereas ropivacaine is the pure (S)-enantiomer.
The current move is toward the development of isolated enantiomeres of many of our medications rather than the use of racemic mixtures.
PDR-Chiral provides chiral method screening of racemic mixtures against the ten most popular chiral columns with its Methods Development Stations (MDS), using up to ten different chiral columns and solvents.
We do not have evidence that this hydrolysis does not occur in shorter-chain racemic mixtures of acylcarnitines, in part because of the lack of information in the abstract by Turner and Dalton (5), and D,L racemic mixtures of other acylcarnitines were not available for purchase.