Journal
AUSTRALIAN JOURNAL OF CHEMISTRY
Volume 55, Issue 1-2, Pages 39-48Publisher
CSIRO PUBLISHING
DOI: 10.1071/CH01189
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Large-ring cyclodextrins (LR-CD) are cyclic alpha-1,4-glucans composed of nine to more than several hundred glucopyranose units. Cyclodextrins are able to form highly specific inclusion complexes with a wide range of guest molecules thereby modifying their physicochemical properties. Only in the past 10 years, LR-CD with a degree of polymerization between 9 and 32 have been isolated and characterized. The structures of these LR-CD show novel features distinct from those of the extensively studied alpha-, beta-, and gamma-CD composed of six, seven, and eight glucopyranose units, respectively. Recent work on the enzymatic synthesis of LR-CD has confirmed the ability of different 4-alpha-glucanotransferases to form large cyclic alpha-1,4-glucans from amylose and amylopectin, depending on the specificity of the enzyme used and on the substrate and reaction conditions chosen. The potential of LR-CD for specific host-guest interactions and corresponding applications has been demonstrated.
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