醗酵による繊維の精練 : (第4報)絲状菌及び木材腐朽菌によるマニラ麻の精練

概要

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We isolated a useful mold from the contaminants of wood destroying fungus culture on the saw dust. This, mold belongs to a variety of Aspergillus niger and shows the most excellent result for the retting of manila hemp than any other molds and wood destroying fungi which were tested in our experiment. For the preparation of inoculum we adopted the solid culture method on saw dust con-taining some nutrients, i.e., the powder of stalk and leaf of sweet potato, alcohol stillage and husk of tea leaf. It was confirmed that these nutrients were utilised to promote the growth and enzymic action also in the course of main retting. The condition of retting are as follows viz., the quantity of liquid medium added is about four times to the raw fibers, the temperature lies between 25°_??_30°C, the pH range is about 5_??_7, and the time required for retting is about 8_??_10 days. The optimum degree of retting is indicated from the decreasing ratio of lignin content, that is, 30_??_45% of its decreasement is suitable for the spinning. The yield of fibers is about 90% to raw materials.
社団法人日本農芸化学会の論文