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Method of using cotton linter to directly prepare microcrystalline cellulose

A technology of microcrystalline cellulose and cotton linters, which is applied in the direction of using microorganism/enzymatic cellulose treatment, cellulose pulp post-treatment, fiber raw material treatment, etc., which can solve complex procedures, microcrystalline cellulose has not been found, and low yield and other issues to achieve the effect of simple process, easy operation and promotion

Active Publication Date: 2017-02-15
JINAN MIDUOTAN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the use of cotton linters in the prior art requires the preparation of natural cellulose and then hydrolysis. The process is complicated, the yield is low, and the quality and purity of the obtained microcrystalline cellulose are poor.
The prior art has not yet found a method for directly preparing microcrystalline cellulose using cotton linters

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for directly preparing microcrystalline cellulose from cotton linters, comprising the steps of:

[0030] 1) Put the cotton linters into a steam explosion separator after unpacking, unpacking, decontamination, and dust removal, add water 10 times the mass of cotton linters, adjust the pH to 7.5 with dilute potassium hydroxide solution, and inject nitrogen to make The linters are evenly distributed and pre-soaked for 20 minutes.

[0031] 2) Add compound protease (600U / Kg dry basis cotton linters), pause for 1 minute, blow nitrogen gas, and enzymatically hydrolyze for 40 minutes; Minutes; then add cellulase (600U / Kg dry basis cotton linters) secreted by Trichoderma viride, and enzymatically hydrolyze for 80 minutes; after enzymolysis, pass steam to raise the temperature to 65°C, and keep warm for 10 minutes to inactivate the activity of the enzyme; The composite protease is composed of alkaline protease with endopeptidase activity and proteinase K with telopeptid...

Embodiment 2

[0043] A method for directly preparing microcrystalline cellulose from cotton linters, comprising the steps of:

[0044] 1) Put the cotton linters into a steam explosion separator after unpacking, loosening, removing impurities and dust, adding water 12 times the quality of the cotton linters, adjusting the pH to 7.8 with dilute lye, and feeding nitrogen to make the cotton linters The fleece is evenly distributed and pre-soaked for 25 minutes.

[0045] 2) Add compound protease (650U / Kg dry basis cotton linters), pause for 1-3 minutes, blow nitrogen, and enzymatically hydrolyze for 30 minutes; add normal temperature type α-amylase (550U / Kg dry basis cotton linters), enzyme hydrolyze for 25 minutes; then add cellulase secreted by Trichoderma viride (650U / Kg dry basis cotton linters) for 70 minutes of enzymolysis; after enzymolysis is completed, heat up to 68°C with steam and keep warm for 12 minutes to inactivate the enzyme activity; the composite protease is composed of alkali...

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Abstract

The invention discloses a method of using cotton linter to directly prepare microcrystalline cellulose and belongs to the technical field of biology. The method includes: using special protease and special normal-temperature amylase to successfully and efficiently remove protein and starch at normal temperature; using alkali liquid to remove hemicellulose, lignin, ash and greasy substance; adopting special cellulase to partly degrade cellulose molecules; maintaining pH to slightly alkaline to enable a cellulose molecule crystal area to be protected, wherein functions of a cellulase damaging crystal area are weakened under slightly alkaline conditions to retain a segment of the cellulose molecule crystal area, and the segment is the microcrystalline cellulose. Ingredients like protein, starch, grease, ash, hemicellulose and lignin in the cotton linter are successfully removed through a simple process, the segment of the cellulose molecule crystal area is retained effectively, and the microcrystalline cellulose having excellent quality is obtained. The method is simple in process and easy to operate and popularize.

Description

technical field [0001] The invention relates to the field of biotechnology, in particular to a method for directly preparing microcrystalline cellulose from cotton linters. Background technique [0002] Microcrystalline cellulose (MCC) is a very fine white short rod or amorphous crystalline powder that reaches the limit degree of polymerization after natural cellulose is hydrolyzed, and the limit degree of polymerization (LODP) is 15-375 (glucose unit); it is not fibrous and flows Very strong. At present, microcrystalline cellulose is widely used in medicine, food, cosmetics and light chemical industries. [0003] Many raw materials of microcrystalline cellulose are wood and cotton, and the cost is relatively high. Cotton linters have the most abundant cellulose content among all fiber materials, with a content of more than 93% (relative to the dry basis of cotton linters). Therefore, it is a good choice to use cotton linters instead of cotton and wood to prepare food and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C9/16D21C9/02
CPCD21C5/00D21C5/005D21C9/02D21C9/163
Inventor 曹吉祥耿皓
Owner JINAN MIDUOTAN NEW ENERGY TECH
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