Crystal Structure of Hydrated Potato Starch

Abstract

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.

Changes in starch structure during manufacturing of starch microspheres for use in parenteral drug formulations: Effects of temperature treatment

“…As can be seen in Table 1, the dry matter content of the microspheres increases during incubation at both temperatures. It is known that the intensity of the diffraction reflections varies with water content in the sample, becoming sharper as hydration increases (Cleven, van den Berg, & van der Plas, 1978). However, for the samples studied here the crystallinity might still be compared as the water contents (70-75 wt.%) are much higher than that reported by Cleven.…”

Hydration and the phase diagram of acid hydrolyzed potato starch

“…Page 18 of 31 A c c e p t e d M a n u s c r i p t 18 number of water molecules are required (Cleven, et al, 1978). As discussed above, in the acid hydrolyzed starch hydration induces an ordered structure.…”

Phase and polymorphic transitions of starches at low and intermediate water contents

“…7.2) while amorphous scattering is lowered. The structuring role of water is more pronounced for B-type native starches whose diffractogram resolution increases throughout the 10-40% water content range (Nara, Mori and Komiya, 1978;Cleven, van den Berg and van der Plas, 1978). The A-type starches are less susceptible to this type of reorganization.…”