NDLI: Parity Violating Energetic Difference and Enantiomorphous Crystalsp-Caveats; Reinvestigation of Tyrosine Crystallization

Content Provider	Springer Nature Link
Author	Lahav, Meir Weissbuch, Isabelle Shavit, Edna Reiner, Clarissa Nicholson, Graeme J. Schurig, Volker
Copyright Year	2006
Abstract	The present article challenges reports claiming to have demonstrated the Parity Violating Energetic Difference (PVED) between enantiomorphous D- and L-crystals. Apart from PVED, the presence of minute quantities and differing profiles of impurities incorporated during their different history of preparation will affect the physical properties of D- and L-crystals. These impurities are anticipated to play a much greater role in affecting crystallization behavior than PVED. The effect of impurities on the growth and dissolution of enantiomorphous crystals is illustrated with some representative examples.Shinitzky et al. (2002) reported recently dramatic differences in the growth and dissolution properties of the D- and L-crystals of tyrosine. We have repeated these experiments using commercial samples from different sources and employing a validated enantioselective gas chromatographic technique. We attribute Shinitzky's findings either to the use of inappropriate analytical techniques for the determination of enantiomeric composition and/or to the presence of unidentified contaminants in the commercial tyrosine samples. Related caveats hold also for the recently published claims by Shinitzky (2006) and Scolnik et al. (2006) to have observed experimentally PVED between enantiomeric helices of poly-glutamic acid composed of 24 repeating units.
Starting Page	151
Ending Page	170
Page Count	20
File Format	PDF
ISSN	01696149
Journal	Origins of Life and Evolution of Biospheres
Volume Number	36
Issue Number	2
e-ISSN	15730875
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-04-27
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	tyrosine parity violating energetic difference D- and L-crystals racemic crystals enantiomeric GC Biochemistry Geochemistry Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Ecology, Evolution, Behavior and Systematics Space and Planetary Science

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