A NEW APPROACH TO THE ORIGIN OF LIFE BY STUDYING CHIRAL POLYMERIZATION OF AMINO ACIDS IRRADIATED BY CIRCULARLY POLARIZED LIGHT

(1)圆偏振光被认为是诱导同型手性氨基酸的主要因素。我们试图通过引入螺旋波动体辐射来检测氨基酸的绝对不对称分解。(2)我们成功地制备了氨基酸(丙氨酸、天冬氨酸、酸和苯丙氨酸)的干膜，并准确地测定了其厚度。(3)我们获得了干膜或氨基酸水溶液在紫外光(175-250 nm)下的吸收光谱和圆二色谱。(4)在205 nm的顺时针和逆时针偏振光下，我们没有检测到L和D型氨基酸的不对称分解的显著差异。(6)测定了氨基酸的光吸收系数的绝对值。(7)独立发表的有机化学实验结果表明，同手性低聚肽(E.G.L-L)比异手性低聚肽(E.G.L-D)在100ﾟC时更稳定地进行水解。(8)这些结果为理解生命物质的手性形成和化学演化提供了有价值的线索。

(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.