The X‐ray diffraction pattern of Nägeli‐treated potato starch was examined and changes in the diffraction pattern of native potato starch were measured for hydrations ranging from 0 to 50%. The fine structure of the diffraction pattern revealed many lines of very weak intensity, superimposed on a “basic structure” with hexagonal unit cell. It is suggested that that a “superstructure” exists in fully hydrated potato starch. A packing arrangement of hydrated potato starch is proposed in which every string of six helical macromolecular chains encloses a cylindrical cavity filled with water structured like cubic ice.
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Cleven et al. (1978) studied this question.
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