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A kind of chemical modification method of gellan gum and its application

A technology of chemical modification and gellan gum, applied in chemical instruments and methods, inorganic chemistry, and other chemical processes, etc., can solve the problem that the pH response range of hydrogel orientation is not wide enough, and achieve good water absorption performance and strong adsorption. Ability, the effect of broad application prospects

Active Publication Date: 2021-05-25
福建省农业科学院农业生物资源研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of the orientation of the hydrogel and the pH response range not being wide enough, the inventors provided a chemical modification method of gellan gum to obtain a pH-sensitive hydrogel

Method used

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  • A kind of chemical modification method of gellan gum and its application
  • A kind of chemical modification method of gellan gum and its application
  • A kind of chemical modification method of gellan gum and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. The preparation method of the new hydrogel

[0039] Accurately weigh 1g gellan gum and dissolve completely in a three-necked flask with 150mL distilled water, add 15-45g acrylic acid (AA) and acrylamide (AM), wherein the mass ratio of acrylic acid and acrylamide (M 丙烯酸 :M 丙烯酰胺 ) is 0.2-5:1, and the neutralization degree of acrylic acid is 50%-90%. Introduce nitrogen to remove the air in the device, heat the system temperature to 50-80°C, add 1%-5% trimethylolpropane triglycidyl ether (TTE) and 1%-5% potassium persulfate (KPS), continue to stir and react for 2-6h, settle with 80% ethanol, soak in 80% ethanol for 12h after sedimentation and filtration, and dry at 50°C to obtain the new hydrogel modified by gellan gum.

[0040] Acrylic acid neutralization degree preparation method: use 5mol / L NaOH to calculate the neutralized acrylic acid by the number of moles, and calculate the required amount of NaOH according to the formula (1) (take 1g of acrylic acid as an examp...

Embodiment 2

[0101] 1. The preparation method of the new hydrogel

[0102] Accurately weigh 1g of gellan gum and completely dissolve it in a three-necked flask filled with 150mL of distilled water, add 30g of AA and AM, wherein the mass ratio of AA to AM is 2:1, and the neutralization degree of acrylic acid is 80%. Introduce nitrogen to remove the air in the device, heat to raise the system temperature to 70°C, add 2% TTE and 2% potassium persulfate, continue stirring for 4 hours, settle with 80% ethanol, and filter with 80% After soaking in ethanol for 12 hours and drying at 50°C, the new hydrogel modified by gellan gum can be obtained.

[0103] 2. Research on the properties of the new hydrogel

[0104] 2.1 Study on the pH sensitivity of the new hydrogel

[0105] At room temperature, weigh an appropriate amount of the new hydrogel to swell in different solvents (distilled water and PBS with pH 1.8, 3, 4, 5, 6.8, 7.4) for 24 hours, measure the swelling rate at regular intervals, and draw...

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Abstract

The invention relates to a gellan gum modification method and application thereof, belonging to the technical field of chemical modification. The modification method uses gellan gum as a matrix, acrylamide and acrylic acid as monomers, trimethylolpropane triglycidyl ether as a crosslinking agent, and is initiated by potassium persulfate to prepare modified gellan gum. new hydrogels. The novel hydrogel of the invention is not only sensitive to pH, but also has good deswelling performance and strong methylene blue adsorption performance, so it has broad application prospects in dye adsorption, water treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical modification, and in particular relates to a chemical modification method of gellan gum and the application of novel hydrogel prepared by modification of gellan gum in dye adsorption. Background technique [0002] The main and side chains of environmentally sensitive hydrogels contain a large number of hydrophilic groups and can absorb a large amount of water. They have a three-dimensional network structure. When the external environment such as pH, temperature, electromagnetic field, etc. change, their volume will also change. It is used in food packaging, biomedical and environmental hygiene and other fields. Natural or synthetic polymer hydrogels have poor biodegradability, and they will cause serious environmental problems after being used in large quantities. [0003] Gellan gum (GG), a novel microbial polysaccharide derived from Sphingomonas paucimobilis. Due to its good functional proper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56B01J20/26B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/261B01J20/28047C02F1/288C02F2101/308C08F251/00C08F220/06C08F220/56
Inventor 朱育菁郑梅霞张龙涛蔡坤淇刘波陈峥
Owner 福建省农业科学院农业生物资源研究所