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首页> 外文会议>International Carbohydrate Symposium >VACUUM-ULTRAVIOLET CIRCULAR-DICHROISM STUDY OF OLIGOSACCHARIDE CONFORMATIONS USING A SYNCHROTRON-RADIATION SPECTROPHOTOMETER
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VACUUM-ULTRAVIOLET CIRCULAR-DICHROISM STUDY OF OLIGOSACCHARIDE CONFORMATIONS USING A SYNCHROTRON-RADIATION SPECTROPHOTOMETER

机译：使用同步辐射分光光度计的寡糖圆形二色性研究寡糖兼容性

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摘要

Vacuum-ultraviolet circular-dichroism (VUVCD) spectroscopy using a synchrotron radiation (SR) is a powerful tool for analyzing saccharide structures (especially unsubstituted saccharides) in aqueous solution because they contain high-energy chromophores such as hydroxy groups and acetal bonds whose n-□* electronic transitions are only detectable in the vacuum-ultraviolet (VUV) region below 190 nm [1, 2]. However, the relationships between the structures and VUVCD of saccharides remain controversial due to the interpretation of the observed CD spectra in the VUV region not being assigned explicitly. We have recently measured the VUVCD spectra of various methyl aldopyranosides in aqueous solution and theoretically revealed the pairwise relationships between configurations (gauche and trans rotamers of hydroxymethyl group at C-5, and □- and D-anomers of hydroxyl group at C-1) and VUVCD of monosaccharides [3]. In the present study, we measured the VUVCD spectra of the unsubstituted malto-, laminari-, isomalto-, and cello-oligosaccharide series with the aim of clarifying the contributions of the different types of constituent disaccharides and increases in chain length to the structures and CD spectra of oligosaccharides.
机译：使用同步辐射（SR）的真空 - 紫外线 - 二色（VUVCD）光谱是一种强大的工具，用于分析水溶液中的糖结构（特别是未取代的糖），因为它们含有高能发色团，例如羟基和缩醛键，其N- □*电子转换仅在190nm以下的真空 - 紫外（VUV）区域中仅可检测到[1,2]。然而，由于未明确分配的VUV区域中观察到的CD光谱，糖的结构和Vuvcd之间的关系仍然存在争议。最近在水溶液中测量了各种甲基醛吡喃糖苷的Vuvcd光谱，理论上揭示了C-1的C-5在C-5的羟甲基的Gauche和羟甲基的转子旋转液之间的成对关系，以及C-1的羟基）和单糖的Vuvcd [3]。在本研究中，我们测量了未取代的Malto，层状，isomalto和细胞 - 寡糖系列的Vuvcd光谱，其目的是阐明不同类型的组分二糖的贡献，并增加了结构的链条长度低聚糖的CD光谱。

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