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The Crystal Structures of A‐, B‐ and C‐Polymorphs of Amylose and Starch
Author(s) -
Sarko A.,
Wu H.C. H.
Publication year - 1978
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19780300302
Subject(s) - amylose , crystallography , crystal structure , starch , materials science , polymorphism (computer science) , diffraction , chemistry , organic chemistry , physics , biochemistry , genotype , optics , gene
The crystal structures of the A‐, B‐ and C‐polymorphs of amylose have been determined through a combination of fiber x‐ray diffraction analysis and computer‐based structure refinement. The three structures correspond to the naturally occurring A‐, B‐ and C‐starches. A‐ and B‐structures differ in the crystalline packing of the helices and the water content. The C‐structure is a mixture of A‐ and B‐unit cells and, therefore, intermediate between the A‐ and B‐forms in packing density.