MEASUREMENT OF SYNTHESIS RATES OF LIVER-PRODUCED PLASMA PROTEINS

Abstract

of the rice-starch solutions. This enzyme is acti- vated by Clions, inhibited by EDTA and does not hydrolyse disaccharides. Amylase B is responsible for only a small fraction of the total amylase activity of the mucosa, but accounts for about half of the amylase activity of the washed particles. It has the properties of a glucamylase (y-amylase; for a review see Lamer, 1960). Glucose is the primary reaction product of the action of a glucamylase on starch. Glucamylases are exoamylases, hydrolysing the terminal a- (1-4)-glucosidic linkages at the non-reducing end of starch chains. During its action the viscosity of a starch solution decreases very slowly. Amylase B also hydrolyses maltose to glucose at approxi- mately the same rate as starch is hydrolysed. It is responsible for about half of the maltase activity of the mucosal preparations.