Stereoisomers of isovaline in the Murchison meteorite |
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Authors: | Glenn E Pollock C-N Cheng Sonja E Cronin Keith A Kvenvolden |
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Institution: | Planetary Biology Division, Ames Research Center, NASA, Moffett Field, California 94035, U.S.A. |
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Abstract: | Isovaline is present in the Murchison meteorite as a racemic mixture (about equal concentrations of the R and S enantiomers). Since isovaline does not have a hydrogen atom on its asymmetric α-carbon atom, the racemic mixture could not have formed by commonly accepted mechanisms of racemization. Thus, isovaline in the meteorite most probably was synthesized as a racemic mixture and is not the result of the racemization of either the R or S enantiomer. Other chiral amino acids in the meteorite are present as racemic mixtures, and were probably synthesized in a similar manner by abiotic, extraterrestrial processes. |
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