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).

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.

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.
References in periodicals archive ?
On the other hand, many pyrethroids are marketed as racemic mixtures, which have in equal enantiomeric proportions.
Future studies will need to examine the antisuicidal and antidepressant effects of the most commonly used racemic ketamine dose (0.5 mg/kg), compared with 84 mg intranasal esketamine.
Comparison of racemic bupivacaine, ropivacaine and levobupivacaine for pediatric caudal anaesthesia: effects on postoperative analgesia and motor block.
The novel polyphosphoester P-12 and some anthracene-derived compounds, among them, the a-aminophosphonates A-3-A-6, their precursors the Schiff bases S-1 and S-2, the bis-aminophosphonate B-6, the two enantiomers A-5a and A-5b of the racemic A-5, and the polyphosphoesters P-8-P-11, containing aminophosphonate units, have been tested for cytotoxicity against a panel of human tumor cell lines: HL60, SKW-3, REH, and K-562.
Most of these studies were comparing S-AM (2.5 to 5 mg) to racemic amlodipine (5 to 10 mg) and found near equal antihypertensive efficacy with lower incidence of side effects.
The spectral data completely correspond to the racemic sample.
She was treated with an additional dose of nebulized racemic epinephrine and was given IV dexamethasone (0.5mg/kg) upon arrival.
Spinal anaesthesia for elective surgery: A comparison of hyperbaric solution of racemic bupivacaine, levobupivacaine and ropivacaine.
The present study evaluated the [ISO.sub.MAC] in dogs premedicated with an acepromazine-morphine combination followed by a single intramuscular dose of racemic or S(+)-ketamine administered after anesthetic induction with propofol.
(38) When the mixture of enantiomers is fifty-fifty, it is known as a "racemic" mixture, and the separation into enantiomers or "racemates" is sometimes called a "chiral switch." (39)