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Likewise, the (S) stereoisomer is much more reactive than the (R) enantiomer in citalopram (Celexa), an antidepressant which inhibits serotonin reuptake, is active.Racemization can be achieved by simply mixing equal quantities of two pure enantiomers.

(To hear a radio interview with George, visit The only other animals with similarly long life spans are the giant tortoise and the giant clam, which some have claimed can live about 150 and 220 years, respectively.Racemization is the process in which one enantiomer of a compound, such as an L-amino acid, converts to the other enantiomer.The compound then alternates between each form while the ratio between the ( ) and (–) groups approaches 1:1, at which point it becomes optically inactive.In chemistry , racemization is the conversion of an enantiomerically pure mixture (one where only one enantiomer is present) into a mixture where more than one of the enantiomers are present.

If the racemization results in a mixture where the Chiral molecules have two forms (at each point of asymmetry), which differ in their optical characteristics: The levorotatory form (the (−)-form) will rotate the plane of polarization of a beam of light to the left, whereas the dextrorotatory form (the ( )-form) will rotate the plane of polarization of a beam of light to the right.

If only one enantiomer is administered to a human subject, both forms may be found later in the blood serum.