Method for preparing powdery crystalline cellulose
AssigneeTosco Corporation
InventorsShozaburo Dobashi, Hisaichiro Uchida, Keiso Ohara
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Abstract
The present invention relates to powdery crystalline cellulose having an average particle size ranging from 3 to 30 .mu.m and an average degree of polymerization ranging from 400 to 1,500. The powdery crystalline cellulose can be prepared according to a method comprising treating a starting cellulose material with a cellulase, subjecting the enzyme-treated cellulose material to acid hydrolysis under mild conditions, and then mechanically pulverizing the hydrolyzed cellulose material. The powdery crystalline cellulose is suitable for various applications of foods, cosmetics, medicines and various industrial products.
Claims13
A method for preparing powdery crystalline cellulose having an average particle size ranging from 3 to 30 .mu.m and an average degree of polymerization ranging from 400 to 1,500, comprising the steps of:
- treating a starting cellulose material with a cellulase;
- subjecting the cellulase-treated cellulose material to acid hydrolysis under mild conditions to yield a hydrolyzed cellulose material;
- and
- mechanically pulverizing the hydrolyzed cellulose material to yield the powdery crystalline cellulose.
A method for preparing powdery crystalline cellulose having an average particle size ranging from 3 to 30 .mu.m and an average degree of polymerization ranging from 400 to 1,500, comprising the steps of:
- treating a starting cellulose material with a cellulase at a pH value ranging from 5.0 to 6.5 and at a temperature ranging from 30.degree. C. to 50.degree. C. for 2 to 3 hours;
- subjecting the cellulase-treated cellulose material to acid hydrolysis at a mineral acid concentration ranging from 0.1 to 8.0N and a temperature ranging from 40.degree. C. to 125.degree. C. for 5 minutes to 9 hours to yield a hydrolyzed cellulose material;
- and
- mechanically pulverizing the hydrolyzed cellulose material to yield the powdery crystalline cellulose.
Dependencies are inferred from the claim text.