g., 290 MeV/u C6+) from HIMAC accelerator (NIRS, Japan) at 77 K or ambient temperature. A mixture of find more carbon monoxide, ammonia and water was irradiated with 3 MeV protons from a van de Graaff accelerator at 10–20 K (Kasamatsu et al, 1997) or ambient temperature. The 4SC-202 nmr products were acid-hydrolyzed, and amino acids were analyzed by HPLC and/or GC/MS. Unhydrolyzed products were analyzed by GFC, pyrolysis-GC/MS, TEM, etc. Racemic mixtures of amino acids were detected in all the irradiation products. There were little difference in energy yields of amino acids (after hydrolysis) between ambient irradiation and low-temperature irradiation.
Molecular weights of unhydrolyzed products are a few thousands, and gave a wide variety of molecules including heterocyclic compounds by pyrolysis-GC/MS. It was suggested that complex amino acid precursors with large molecular weights could be formed in ice mantles selleck inhibitor of interstellar dusts in dense clouds by action of cosmic rays.
The complex amino acid precursors were much more stable than free amino acids against radiation, heating and high-velocity impacts. They showed amorphous particulate cottony images of high-molecular-weight complex organics by TEM and AFM. When they were irradiated with circularly polarized UV light (CPL) from a synchrotron and then acid-hydrolyzed, enantiomeric excesses were observed, and amino acid yields before and after CPL was Acyl CoA dehydrogenase almost the same (Takano et al., 2007). These results implied that the not only amino acids but also seeds of their homochirality were formed in interstellar cold environments, and they were delivered by extraterrestrial bodies to Earth. Kasamatsu, T., Kaneko, T., Saito and Kobayashi, K. (1997). Formation of organic compounds in interstellar media with high energy particles. Bull. Chem. Soc. Jpn., 70: 1021–1026. Nakamura-Messenger, K., Messenger, S., Keller, L. P., Clemett, S. J. and Zolensky, M. E. (2006). Organic globules in the Tagish Lake Meteorite: Remnants of the protosolar disk. Science, 314:1439–1442. Takano, Y., Takahashi, J., Kaneko, T., Marumo, K. and Kobayashi, K.
(2007). Asymmetric synthesis of amino acid precursors in interstellar complex organics by circularly polarized light. Earth Planet. Sci. Lett., 254: 106–114. E-mail: [email protected]ac.jp Investigation of Laser Plasma Chemistry in CO 2 –N 2 –H 2 O Using 18 O Labeled Water Martin Ferus1,2, Petr Kubelík1,2, Libor Juha2, Svatopluk Civiš1 1J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic; 2Institute of Physics, Academy of Sciences of the Czech Republic, v.v.i., Na Slovance 2, 182 23 Prague 8, Czech Republic This work is focused on chemical reactions in organic gas mixtures in high-power laser induced plasma which may lead to formation of small organic compounds.