Internal Architecture of Potato and Canna Starch

Abstract

Some details of the internal architecture of potato and canna starches were obtained from uniformly crushed granules. The growth appears to' be principally by intus susception and proceeds along a hilum canal toward the periphery of the granules. The presence of a cavity and hilum canal in potato starch granules is used to explain some swelling phenomena such as bubble formation and invagination. Some evidence of a membrane encasing potato and canna starches is cited. The internal details of wrinkled-pea starch were also studied; the expected shell-type layering was found with this starch and the growth is apparently by apposition.