Abstract
Alkali-susceptibilities of various starch granules were exhibited well by a new method, light-scattering-alkali-amylography. The method was established as follows: Ten cc of 0.2_??_0.5% starch suspension in a test tube with a stopper was put in an electric nephelo-meter and the intensity of scattered light was adjusted to 100%. A definite amount of 3 N KOH solution, usually 0.1 cc, was added to the suspension, the suspension was turned over several times and kept at constant temperature, and the intensity of scattered light was determined 5 or 10 minutes after the addition of alkali. Thus, a curve of light intensity against normality of alkali was obtained by the use of less than 0.5g starch within an hour. This method could show if a sample starch was a mixture of an alkali-resistant and an alkali-susceptible starches.
