氨基酸膜在UV-VUV区的圆二色性。

Enantiomer Pub Date : 2002-07-01 DOI:10.1080/10242430212884
Masahito Tanaka, Y. Kodama, K. Nakagawa
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引用次数: 12

摘要

在紫外-紫外波段测量了丙氨酸和丙氨酸二肽升华膜的圆二色性(CD)光谱。当薄膜具有一定的线性各向异性时,视光盘信号被认为是强线性各向异性分布的。为了获得真实的CD光谱,我们对l -丙氨酸薄膜进行了检测。我们测量了线性二色光谱和CD光谱作为样品旋转角度的函数,将样品翻转。在这些测量的基础上,我们得出结论,对于精心制备的薄膜,线性各向异性对CD的贡献足够小。此外,我们还揭示了制备厚度小于100 nm的丙氨酸薄膜对于精确测量至关重要。比较了氨基酸膜与水溶液的CD。固膜CD信号的征象与天冬氨酸相同,但与丙氨酸和丙氨酸二肽的水溶液相反。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Circular dichroism of amino acid films in UV-VUV region.
Circular dichroism (CD) spectra of sublimated films of alanine and alanine dipeptide were measured in UV-VUV region. When a film has some linear anisotropy, the apparent CD signal is known to be strongly distributed by linear anisotropy. In order to obtain the true CD spectra, we examined this disturbance for L-alanine films. We measured linear dichroism spectra and CD spectra as a function of the sample rotation angle, turning the sample over. On the basis of these measurements, we concluded that the linear anisotropy contribution to CD was sufficiently small for carefully prepared films. In addition, we revealed that it is essential for accurate measurement to prepare thin film of which thickness is smaller than 100 nm for the case of alanine films. CD of amino acid films was compared with that of aqueous solution. Sign of CD signal of solid films was observed to be the same for aspartic acid, but it was reversed from that of aqueous solution for alanine and alanine dipeptide.
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