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纯手性氨基酸的主要因素。我们试图通过引入螺旋波荡器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）的干燥薄膜，其厚度被精确地确定。(3)在紫外光（175- 250 nm）照射下，测得了干膜和氨基酸水溶液的吸收光谱和圆二色性谱。(4)然而，我们不能检测到L-和D-型氨基酸在顺时针或逆时针偏振光下在205 nm处的不对称分解的显着差异，其中CD吸收差异最大。(5)对氨基酸的酸性溶液也得到了类似的结果。(6)测定了氨基酸的光吸收系数的绝对值。(7)独立进行的有机化学实验结果表明，纯手性寡肽（如L-L-L-L）比异手性寡肽（如L-L-L-D）在100 ℃水解更稳定。(8)这些发现将为理解生命物质的手性形成和化学演化提供有价值的线索。

(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.