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X‐Ray diffraction of ethylenediamine–amylose complex
Author(s) -
Simpson T. D.
Publication year - 1970
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1970.360090907
Subject(s) - amylose , chemistry , ethylenediamine , crystallography , yield (engineering) , molecule , tetragonal crystal system , solvent , crystal structure , inorganic chemistry , organic chemistry , materials science , starch , metallurgy
Solutions of amylose in ethylenediamine yield a crystalline film complex upon evaporation of solvent. The x‐ray analysis indicates the presence of a tetragonal‐shaped cell with a symmetry approximating that of space group P2 1 2 1 2 1 . The amylose sixfold helix has a diameter of 13.3 Å and a translation period of 8.0Å. Chemical and physical analyses support a complexing ratio of one ethylenediamine molecule to every two glucose units. The structure is nearly identical to any amylose–dimethyl sulfoxide complex previously examined. The square mode of packing arrangement appears to result from complexation between amylose chains. Such complexing indicates a much greater degree of amylose interaction than is observed in amylose complex structures having a hexagonal close‐packing arrangement.