1997 Fiscal Year Final Research Report Summary
A NEW APPROACH TO THE ORIGIN OF LIFE BY STUDYING CHIRAL POLYMERIZATION OF AMINO ACIDS IRRADIATED BY CIRCULARLY POLARIZED LIGHT
| Project/Area Number |
07409005
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
広領域
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| Research Institution | KOBE UNIVERSITY |
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Principal Investigator |
AMAKAWA Taisaku KOBE UNIVERSITY,FACULTY OF HUMAN DEVELOPMENT,PROFESSOR, 発達科学部, 教授 (70031359)
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| Co-Investigator(Kenkyū-buntansha) |
EBINA Kuniyoshi KOBE UNIVERSITY,FACULTY OF HUMAN DEVELOPMENT,ASSOCIATE PROFESSOR, 発達科学部, 助教授 (50151999)
MORII Toshiyuki KOBE UNIVERSITY,FACULTY OF HUMAN DEVELOPMENT,PROFESSOR, 発達科学部, 教授 (20031370)
TERAKADO Yasutaka KOBE UNIVERSITY,FACULTY OF HUMAN DEVELOPMENT,ASSOCIATE PROFESSOR, 発達科学部, 助教授 (30127378)
UEJI Shin-chi KOBE UNIVERSITY,FACULTY OF HUMAN DEVELOPMENT,PROFESSOR, 発達科学部, 教授 (40031364)
NAKAGAWA Kazumichi KOBE UNIVERSITY,FACULTY OF HUMAN DEVELOPMENT,PROFESSOR, 発達科学部, 教授 (00134403)
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| Project Period (FY) |
1995 – 1997
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| Keywords | amino acids / chiral polymerization / origin of life / circularly polarized light / synchrotron radiation |
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| Research Abstract |
(1) Circularly polarized light has been suggested as a main factor that induces homochiral amino acids. We tried to detect an absolute asymetric decomposition of amino acids by introducing helical undulator radiation.
(2) We succeeded in preparing dried thin films of amino acids (Alanine, Aspartic, acid and Phenylalanine) of which thickness was determined with accuracy.
(3) We obtained absorption spectra and CD spectra of ultra violet radiation light (175-250nm) on the dried films or aqueous amino acids.
(4) We could not, however, detect a significant difference of asymmetrical decomposition between L- and D-type amino acid under clockwise or counterclockwise polarized lights at 205 nm, where CD-absorption difference is the highest.
(5) The similar results as above were obtained for acidic solution of amino acids.
(6) Absolute values of optical absorption coefficient of amino acids were determined.
(7) The results of organic chemistry experiment independently curried out showed that the homochiral oligo peptides (e.g.L-L-L-L) were more stable to hydrolysis at 100ﾟC than the heterochiral oligo peptide (e.g.L-L-L-D).
(8) These findings described here would give a valuable clue to understand the chirality formation and chemical evolution of life materials.
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