Abstract
Abstract A study has been made of the crystallization of amylose from stirred solutions. It was found that a highly turbulent flow can induce fibrillar crystallization in a 5% solution of amylose in 1 N KOH and in 35% chloral hydrate. Furthermore it was observed that these fibrillar crystals were insoluble in the original solution after crystallization. Electron microscopic investigations revealed the presence of long fibrils, sometimes aggregated to larger units. Some fibers displayed transverse striations resembling the well-known shish-kebab structures. Treatment of the fibrillar crystals with iodine yielded the well-known blue coloring characteristic for amylose. However, in the electron microscope it was seen that only discrete portions of the fibers were stained. Stirring of aqueous n-butanol solutions of amylose resulted in the formation of small rodlike fibrils in addition to lath-shaped single crystals to which a large number of tentacles were attached. Rectangular-shaped crystals, grown in quies...
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