糊化過程におけるデンプン粒子の構造および力学的特性

光散乱法によるデンプン粒子の物性研究 (第 1 報)

抄録

Several kinds of starch granules are heated in water at various temperatures. The process is observed mainly by the technique of small-angle light scattering, polarizing microscopy, and amylography. The Hv light scattering pattern becomes smaller with increasing the temperature and finally shows the “speckled” appearance.
These results indicate that the increase of the degree of swelling of starch granules with increasing the temperature and an interspherulitic interference generated by the special configuration of starch granules due to the collapse at the higher temperature. The interspherulitic interference gives rise to predictable diffraction phenomena in the Hv scattering pattern due to the coherency of the beam at the higher temperature. Thus, the temperature dependence of the swelling and the collapse are found to be dependent upon a little the kinds of starch. These results are not contradictory of those obtained by the polarizing microscopy and the amylograph for the most part. Incidentally, the technique of light scattering has advantages for investigating the orientation disorder of scattering elements with respect to the radius within the spherulite as well as the collapse of the spherulites, which is not entirely possible by the polarizing microscopy.