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Preparation method for carboxyethyl welan gum

A technology of carboxyethyl Welan gum and Welan gum, which is applied in the field of modification of microbial polysaccharides, can solve the problems of slow dissolution rate, high content of water-insoluble matter, poor thickening ability, etc., and achieve easy acquisition and improved dissolution time Effect

Active Publication Date: 2014-02-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct use of Welan gum as oil displacing agent cannot rapidly swell and hydrate, has slow dissolution rate, poor thickening ability, and high water-insoluble content, which affects its practical application

Method used

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  • Preparation method for carboxyethyl welan gum
  • Preparation method for carboxyethyl welan gum
  • Preparation method for carboxyethyl welan gum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a three-necked flask, take Welan gum and dissolve it in water to form an aqueous solution with a concentration of 0.002mol / L, and stir at a speed of 450rpm to allow it to fully dissolve; in the solution prepared by 3-chloropropionic acid and potassium acetate, , the concentration of 3-chloropropionic acid is 0.004mol / L, the concentration of potassium acetate is 0.004mol / L, and the molar ratio of Velan Gum:3-chloropropionic acid is controlled to be 1:1; within 10~60min, 3- The solution of chloropropionic acid and potassium acetate was added dropwise at a constant speed; reacted at normal pressure, 60°C, and stirred for 1 hour, collected the reaction solution, poured it into absolute ethanol to precipitate carboxyethyl Velan gum, washed it, and Dry at 40°C and pulverize to obtain carboxyethyl welan gum. The product was dissolved in 400mL of 2wt% KCl solution, dissolved within 90min, and the degree of substitution of the product was 1.72.

Embodiment 2

[0026] In a three-necked flask, take Welan gum and dissolve it in water to form an aqueous solution with a concentration of 0.004mol / L, and stir it at a speed of 540rpm to fully dissolve it; in the solution prepared by 3-chloropropionic acid and potassium hydroxide, Wherein, the concentration of 3-chloropropionic acid is 0.016mol / L, the concentration of potassium hydroxide is 0.012mol / L, and the molar ratio of controlling Welan gum: 3-chloropropionic acid is 1:3; Add the solution of 3-chloropropionic acid and potassium hydroxide dropwise at a constant speed; react at normal pressure, 75°C and stirring for 5 hours, collect the reaction solution, pour it into absolute ethanol to precipitate carboxyethyl Velan gum, Wash, dry at 45°C, and pulverize to obtain carboxyethyl welan gum. The product was dissolved in 400mL of 2wt% KCl solution, dissolved within 30min, and the degree of substitution of the product was 0.58.

Embodiment 3

[0028] In a three-necked flask, dissolve Welan gum in water to form an aqueous solution with a concentration of 0.01mol / L, and stir it at a speed of 550rpm to fully dissolve it; in the solution prepared by 3-chloropropionic acid and sodium hydroxide, Wherein, the concentration of 3-chloropropionic acid is 0.02mol / L, the concentration of sodium hydroxide is 0.02mol / L, and the molar ratio of controlling Welan gum: 3-chloropropionic acid is 1:5; Add the solution of 3-chloropropionic acid and sodium hydroxide dropwise at a constant speed; react at normal pressure, 80°C, and stir for 6 hours, collect the reaction solution, pour it into absolute ethanol to precipitate carboxyethyl Velan gum, Wash, dry at 50°C, and pulverize to obtain carboxyethyl welan gum. The product was dissolved in 400mL of 2wt% KCl solution, dissolved within 90min, and the degree of substitution of the product was 0.42.

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Abstract

The invention discloses a preparation method for a carboxyethyl welan gum. The preparation method comprises the following steps: dissolving welan gum in water under the condition of stirring, dripping solution prepared from 3-chloropropionic acid and a catalyst into the welan gum water solution, reacting for 1 to 6 h at normal pressure and 60 to 80 DEG under the condition of stirring, collecting the reaction liquid, pouring the reaction liquid in anhydrous ethyl alcohol to enable carboxyethyl welan gum to be separated, washing, drying, and smashing to obtain the carboxyethyl welan gum. According to the invention, carboxylic acid group is introduced to welan gum, so that the water dissolving speed of welan gum can be improved.

Description

technical field [0001] The invention belongs to a method for modifying microbial polysaccharides, in particular to a method for modifying welan gum. Background technique [0002] Welan gum is a high molecular polysaccharide biopolymer produced by fermentation of corn starch. Its main chain structure is composed of units of D-glucose, D-glucuronic acid, D-glucose and L-rhamnose, and the side chain is composed of single-chain L-mannose or single-chain L-rhamnose Composition, the molecular weight is as high as several million. Its structure is close to that of guar gum. In the structure of guar gum, D-mannose is the main chain, and the side chain is galactose. According to different origins, the molecular weight is distributed between 200,000 and 2 million. [0003] Table 1. Welan Gum vs. Guar Gum Comparison [0004] [0005] Welan gum is one of the most promising microbial polysaccharides developed by Kelco in the United States in the 1980s after xanthan gum and gellan g...

Claims

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Application Information

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IPC IPC(8): C08B37/00
Inventor 郭凯李昕赵李欢欧阳平凯
Owner NANJING UNIV OF TECH
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