Complexes of Starchy Materials with Organic Compounds

Abstract

The crystal structure of γ-cyclodextrin complexes with several organic compounds have been investigated by X-ray powder method. A two-dimensional tetragonal unit cell having a=b=27.2Å and a two-dimensional hexagonal unit cell having a=b=32.7Å, were reasonably proposed for hydrated and anhydrous γ-dextrin complexes, respectively. The change of the crystal structure caused by dehydration seemed to be resulted from the change of the packing arrangement of circular cylinders that are made by coaxial alignment of the dextrin molecules. Results obtained were tentatively applied to consider the 81-helical configuration of amylose.