Cited by 6Origins and Evolution of LifeAnalytical Chemistry and ChromatographyCalcium Carbonate Crystallization and Inhibition

Racemate Resolution of Alanine and Leucine on Homochiral Quartz, and Its Alteration by Strong Radiation Damage

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Garcia, Adrien D., Meinert, Cornelia, Finger, Friedrich, Meierhenrich, Uwe J., Hejl, Ewald·2021·Life

Abstract

Homochiral proteins orchestrate biological functions throughout all domains of life, but the origin of the uniform l-stereochemistry of amino acids remains unknown. Here, we describe enantioselective adsorption experiments of racemic alanine and leucine onto homochiral d- and l-quartz as a possible mechanism for the abiotic emergence of biological homochirality. Substantial racemate resolution with enantiomeric excesses of up to 55% are demonstrated to potentially occur in interstitial pores, along grain boundaries or small fractures in local quartz-bearing environments. Our previous hypothesis on the enhanced enantioselectivity due to uranium-induced fission tracks could not be validated. Such capillary tubes in the near-surface structure of quartz have been proposed to increase the overall chromatographic separation of enantiomers, but no systematic positive correlation of accumulated radiation damage and enantioselective adsorption was observed in this study. In general, the natural l-quartz showed stronger enantioselective adsorption affinities than synthetic d-quartz without any significant trend in amino acid selectivity. Moreover, the l-enantiomer of both investigated amino acids alanine and leucine was preferably adsorbed regardless of the handedness of the enantiomorphic quartz sand. This lack of mirror symmetry breaking is probably due to the different crystal habitus of the synthetic z-bar of d-quartz and the natural mountain crystals of l-quartz used in our experiments.

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  • Garcia et al. demonstrated an experimentally significant deracemization (1-55%) of racemic alanine and leucine solutions on homochiral quartz sand.

    “In a 2021 paper, Garcia et al. demonstrated an experimentally significant deracemization (1-55%) of racemic alanine and leucine solutions on homochiral quartz sand. (Garcia et al., 2021)”

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Authors
Garcia, A. D., Meinert, C., Finger, F., Meierhenrich, U. J., & Hejl, E.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • University of Salzburg (AT)
Corresponding author
  • Meinert, Cornelia
  • Hejl, Ewald
Venue
Life
Publisher
MDPI AG
Published
2021-11-11
Volume
11
Issue
11
Pages
1222
ISSN
2075-1729 (ISSN-L)
OpenAlex
W3211418069
Cited by
6
References
44
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 1 · 2022: 2
FWCI
0.54
Type
journal article
Language
en
Open access
Locations
  • Life (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • European Research Council (804144)
  • FWF Austrian Science Fund (P 30444-N28)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
  • Physical Sciences › Chemistry › Spectroscopy › Analytical Chemistry and Chromatography
  • Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
Keywords
origin of homochirality, enantioselective adsorption, racemic resolution, alanine, leucine, quartz, radiation damage, amino acid chirality, enantiomeric excess, crystal morphology

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