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Quaternary ammonium glutelin protein synthetic method

A synthesis method and gluten protein technology, applied in the field of papermaking, can solve the problems of inability to enhance fiber strength, poor binding effect of plant fibers, inability to improve protein solubility, etc. The effect of exponential increase

Inactive Publication Date: 2008-05-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modification by hydrolysis method can only improve the solubility of gluten protein, but it is not good for improving the binding effect of plant fibers. At the same time, because hydrolysis reduces the molecular weight of protein, it cannot be used to enhance fiber strength; acylation modification cannot improve protein solubility. It cannot be used as a fiber reinforcement after modification

Method used

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  • Quaternary ammonium glutelin protein synthetic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First gluten protein is dissolved in the sodium hydroxide solution of 0.1 mol / liter, then adds 30% sodium hypochlorite solution, the mass ratio of gluten protein and sodium hypochlorite (calculated by solid content) is 1: 1, and temperature is controlled at 60 ℃, React for 1 hour to obtain pre-treated gluten protein. Then react with a quaternization reagent (N,N,N-trimethylpropylene oxide chloride), the mass ratio is 1:1, the reaction temperature is 50° C., and the reaction time is 6 hours to obtain quaternized gluten protein.

Embodiment 2

[0022] First gluten protein is dissolved in the sodium hydroxide solution of 0.1 mol / liter, then adds the sodium hypobromite solution of 30%, and mass ratio is 1: 1.5, and temperature is controlled at 60 ℃, reacts 1 hour, obtains the gluten of pretreatment Prion. Then react with a quaternization reagent (N,N,N-trimethylpropylene oxide chloride), the mass ratio is 1:1.1, the reaction temperature is 30° C., and the reaction time is 6 hours to obtain quaternized gluten protein.

Embodiment 3

[0024] First gluten protein is dissolved in the sodium hydroxide solution of 0.1 mol / liter, then adds 30% ammonium hypochlorite solution, and mass ratio is 1: 1.1, and temperature is controlled at 60 ℃, reacts 1 hour, obtains the corn of pretreatment Prion. Then react with a quaternization reagent (N,N,N-trimethylpropylene oxide chloride), the mass ratio is 1:1.2, the reaction temperature is 70° C., and the reaction time is 4 hours to obtain quaternized gluten protein.

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Abstract

The invention discloses a method for synthesizing quaternized gluten protein. Firstly, hypohalite is used to pretreat gluten protein. The mass ratio of gluten protein to hypohalite is 1:1-1:2. Convert the free amide groups on the gluten protein into fatty amino groups; then use cationic quaternary ammonium epoxy chloride with a mass ratio of 1:1 to 1:1.5 to carry out grafting reaction with the pretreated gluten protein to generate quaternary ammonium salts Cationic modified gluten protein. Through the pretreatment reaction of hypohalite, the content of fatty amino groups on the protein molecular chain can be increased, which is beneficial to the quaternization reaction, and the combination of protein and plant fiber can be improved; the solubility of gluten protein can be improved, and it is more suitable for plant fiber ( Pulp) for sizing.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a method for synthesizing quaternized gluten protein. Background technique [0002] Gluten protein is a kind of plant protein, which is the residue after starch processing of grains such as wheat and corn. Gluten protein can be used as a strength-enhancing aid in papermaking technology. There are many active groups on the protein molecular chain, such as amino, hydroxyl, carboxyl, etc., which have special reactivity and can produce Chemical combination increases the binding force between paper fibers and improves the physical strength of paper. However, since gluten protein contains more hydrophobic amino acids and uncharged amino acids, the area of ​​hydrophobic interaction in the molecule is larger, and the solubility is lower, which often cannot meet the needs of paper production, and its application has many limitations. Therefore, gluten protein is often modified to improve its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/22
Inventor 付时雨詹怀宇邓敏
Owner SOUTH CHINA UNIV OF TECH
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