醗酵による纖維の精練に就て : (第8報)黒黴解膠酵素の作用

概要

論文の詳細を見る
Using crude enzyme prepared from mold4 bran extract of Asp. niger sp., we studied the condi-tions of degumming action on ramie fiber, which has been considered mainly owing to the micro-bial protopectinase. The reaction is likely of the first order until dissolution of pectin goes to the extent of 8_??_%, and hardly proceeds anymore, which is probably due to the structural resistance of the pectic substance for further degradation. The optimum conditions for the depectinizing action are found to be pH 3-4 and 40°. The enzyme is stable in considerably acidic solution and inactivated by treatment at 60° for 2 hours. Addition of oxalate accerelates the degumming action, while Ca++ ion prevents it markedly. This suggests that the pectic substance in parenchima of ramie has a close relationto Ca++ ion probably in forming Ca-pectinate or protopectin as pictured by HENGLEIN in 1943.
社団法人日本農芸化学会の論文