The Distribution of Particle Size and the Viscous Property of Konjac (Amorphophallus Konjac C. Koch) Powder

Abstract

The relationship between the particle size of konjac powder and the viscous property of its solution was discussed. Then, the factor affecting the distribution of particle size was examined.
As for the viscosity in glucomannan equivalent, no difference was observed among the fractions of large particle (40-150mesh). The viscosity of fine particle (150-200mesh) was significantly inferior to that of large one. This tendency was recognized in every lot of powders regardless of the origin of raw material and preparing method of powder.
The distribution of particle size was almost independent of usual process of preparatioh, e.g., slicing of fresh material, drying of sliced chip and milling of Arako (dried chip), though it was remarkably varied with the origin of fresh material.
These facts indicate that the distribution of particle size and the viscous property of each particle are affected exclusively by the growing condition of mannan granule in living plant. Therefore, by improvement of preparing method of powder, it is impossible to decrease the fine part of powder, or to increase the viscosity of fine particle.