Induced circular dichroism study of the aqueous solution complexation of cello-oligosaccharides and related polysaccharides with aromatic dyes
作者： Allan R. Engle , Neil Purdie , John A. Hyatt
DOI: 10.1016/0008-6215(94)00235-5
关键词: Polysaccharide 、 Cellulose 、 Circular dichroism 、 Aqueous solution 、 Bacterial cellulose 、 Crystallinity 、 Organic chemistry 、 Acetobacter 、 Oligosaccharide 、 Chemistry
摘要: Acetobacter xylinum, grown in the presence of low levels water-soluble dye Calcofluor White ST produces a pellicle cellulose that has no detectable crystallinity. Biological factors this sort are probably more important than physical controlling higher order structures celluloses. Circular dichroism (CD) is induced by complexes formed specific interactions between chiral oligosaccharides and molecules. Using CD, equilibrium constants were measured for association reactions various dyes with series cello-oligosaccharides (n = 2-6), methylcellulose, hydroxypropylcellulose (HPC), amylose, cyclomalto-oligosaccharides (cyclodextrins), linear malto-oligosaccharides 3-7). Possible structural features discussed. Dyes capable binding to cello-oligomers aqueous solutions same modify solid structure bacterial cellulose. An analogy cellulose-degrading enzyme, cellobiohydrolase I,
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