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首页> 外文期刊>International Journal of Biological Macromolecules: Structure, Function and Interactions >Structural investigation of amylose complexes with small ligands: helical conformation, crystalline structure and thermostability
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Structural investigation of amylose complexes with small ligands: helical conformation, crystalline structure and thermostability

机译：具有小配体的直链淀粉复合物的结构研究：螺旋构象，晶体结构和热稳定性

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摘要

Crystalline amylose complexes were prepared with decanal, 1-butanol, menthone and alpha-naphtol. Their crystalline structure and the related helical conformation, determined by wide angle X-ray diffraction (WAXD) and C-13 CPMAS solid state NMR, were assigned to V6I, V6II, V6III and V8 types, respectively. It was possible to propose some hypotheses on the possible nature of interactions and especially intra-/inter-helical inclusion. Some shifts in the NMR C1 carbon signals were attributed to the presence of ligand in specific sites inside the structure for a same type of V6 helical conformation. Moreover, the crystallinity and polymorphic changes induced by desorption/rehydration were studied. A general increase of the carbon resonances sharpness upon rehydration has been observed, but also a V6II-V6I transition when decreasing the water content. Differential scanning calorimetry (DSC) experiments were also performed to approach the thermostability of the four types of complex and also the way they form again after melting/cooling sequences. (c) 2004 Elsevier B.V All rights reserved.
机译：用癸醛，1-丁醇，薄荷酮和α-萘酚制备结晶直链淀粉复合物。通过广角X射线衍射（WAXD）和C-13 CPMAS固态NMR测定的它们的晶体结构和相关的螺旋构象分别指定为V6I，V6II，V6III和V8类型。可能对相互作用的可能性质提出一些假设，尤其是螺旋内/螺旋间包含。 NMR C1碳信号的某些变化归因于同类型V6螺旋构象的结构内部特定位点中的配体存在。此外，研究了由解吸/再水化引起的结晶度和多晶型变化。观察到再水化时碳共振尖锐度总体上增加，但是当降低水含量时也观察到V6II-V6I转变。还进行了差示扫描量热法（DSC）实验，以接近四种复合物的热稳定性，以及它们在融化/冷却顺序后再次形成的方式。 （c）2004 Elsevier B.V保留所有权利。

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