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首页> 美国卫生研究院文献>International Journal of Molecular Sciences >Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser
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Chirality Emergence in Thin Solid Films of Amino Acids by Polarized Light from Synchrotron Radiation and Free Electron Laser

机译：同步辐射和自由电子激光偏振光在氨基酸固体薄膜中的手性出现

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One of the most attractive hypothesis for the origin of homochirality in terrestrial bioorganic compounds is that a kind of “chiral impulse” as an asymmetric excitation source induced asymmetric reactions on the surfaces of such materials such as meteorites or interstellar dusts prior to the existence of terrestrial life (Cosmic Scenario). To experimentally introduce chiral structure into racemic films of amino acids (alanine, phenylalanine, isovaline, etc.), we irradiated them with linearly polarized light (LPL) from synchrotron radiation and circularly polarized light (CPL) from a free electron laser. After the irradiation, we evaluated optical anisotropy by measuring the circular dichroism (CD) spectra and verified that new Cotton peaks appeared at almost the same peak position as those of the corresponding non-racemic amino acid films. With LPL irradiation, two-dimensional anisotropic structure expressed as linear dichroism and/or linear birefringence was introduced into the racemic films. With CPL irradiation, the signs of the Cotton peaks exhibit symmetrical structure corresponding to the direction of CPL rotation. This indicates that some kinds of chiral structure were introduced into the racemic film. The CD spectra after CPL irradiation suggest the chiral structure should be derived from not only preferential photolysis but also from photolysis-induced molecular structural change. These results suggest that circularly polarized light sources in space could be associated with the origin of terrestrial homochirality; that is, they would be effective asymmetric exciting sources introducing chiral structures into bio-organic molecules or complex organic compounds.
机译：关于陆生生物有机化合物同手性起源的最有吸引力的假设之一是，一种“手性冲动”作为不对称激发源，在存在陆地之前，在诸如陨石或星际尘埃等物质的表面上引起了不对称反应。生活（宇宙场景）。为了实验性地将手性结构引入氨基酸（丙氨酸，苯丙氨酸，异缬氨酸等）的外消旋膜中，我们用来自同步加速器辐射的线性偏振光（LPL）和来自自由电子激光的圆偏振光（CPL）照射了它们。辐照后，我们通过测量圆二色性（CD）光谱评估了光学各向异性，并验证了新的Cotton峰出现在与相应非外消旋氨基酸膜几乎相同的峰位置。用LPL照射，将表示为线性二色性和/或线性双折射的二维各向异性结构引入外消旋膜中。在CPL照射下，棉峰的符号显示出与CPL旋转方向相对应的对称结构。这表明外消旋膜中引入了一些手性结构。 CPL辐照后的CD光谱表明，手性结构不仅应源自优先光解，还应源自光解诱导的分子结构变化。这些结果表明，空间中的圆偏振光源可能与地球同手性的起源有关。也就是说，它们将是有效的不对称激发源，将手性结构引入生物有机分子或复杂的有机化合物中。

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