Enantioselective Crystallization of Sodium Chlorate in the Presence of Racemic Hydrophobic Amino Acids and Static Magnetic Fields
| Autor: | Susana Osuna-Esteban, Sabino Veintemillas-Verdaguer, César Menor-Salván, Marí a-Paz Zorzano, Marta Ruiz-Bermejo |
|---|---|
| Přispěvatelé: | Instituto Nacional de Técnica Aeroespacial (España), Ministerio de Educación y Ciencia (España), Consejo Superior de Investigaciones Científicas (España) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
jel:A00
Evaporation astrobiology magnetic field homochirality jel:C00 lcsh:Technology law.invention Double blind chemistry.chemical_compound prebiotic organic reactions in water law Management of Technology and Innovation geomagnetic field racemic hydrophobic amino acids terrestrial planets Organic chemistry Crystallization lcsh:Science (General) chemistry.chemical_classification jel:Z00 Chemistry lcsh:T Enantioselective synthesis Astrobiology Amino acid Magnetic field Crystallography Homochirality Sodium chlorate lcsh:Q1-390 |
| Zdroj: | Challenges, Vol 5, Iss 1, Pp 175-192 (2014) Digital.CSIC. Repositorio Institucional del CSIC instname Challenges Volume 5 Issue 1 Pages 175-192 |
| ISSN: | 2078-1547 |
| Popis: | We study the bias induced by a weak (200 mT) external magnetic field on the preferred handedness of sodium chlorate crystals obtained by slow evaporation at ambient conditions of its saturated saline solution with 20 ppm of added racemic (dl) hydrophobic amino acids. By applying the Fisher test to pairs of experiments with opposing magnetic field orientation we conclude, with a confidence level of 99.7%, that at the water-air interface of this saline solution there is an enantioselective magnetic interaction that acts upon racemic mixtures of hydrophobic chiral amino acids. This interaction has been observed with the three tested racemic hydrophobic amino acids: dl-Phe, dl-Try and dl-Trp, at ambient conditions and in spite of the ubiquitous chiral organic contamination. This enantioselective magnetic dependence is not observed when there is only one handedness of added chiral amino-acid, if the added amino acid is not chiral or if there is no additive. This effect has been confirmed with a double blind test. This novel experimental observation may have implications for our view of plausible initial prebiotic scenarios and of the roles of the geomagnetic field in homochirality in the biosphere. This research was supported by the Instituto Nacional de Técnica Aerospacial (INTA) and by the grant AYA2006-15648-C02-02 of the Ministerio de Educación y Ciencia (Spain) and by the project grants AYA2011-25720 and AYA2012-38707 of MINECO (Spain). We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI). |
| Databáze: | OpenAIRE |
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