Process for preparing super strength water absorbent from polyglutamic acid prepared by microbe fermentation and synthesis

A technology of microbial fermentation and super water-absorbing agent, which is applied in absorbent pads, medical science, bandages, etc., can solve the problems of complicated operation method of chemical cross-linking method, low water absorption rate of gel, poor biocompatibility, etc. Time used, high production efficiency, simple production process effect

Inactive Publication Date: 2006-02-08
NANKAI UNIV
View PDF1 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical cross-linking method has complex operation methods, many reaction steps, long action time, high action temperature, low product yield and poor biocompatibility, generally low water absorption of the gel, and the use of a large number of chemical cross-linking agents c...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for preparing super strength water absorbent from polyglutamic acid prepared by microbe fermentation and synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 2ml of deionized water to a 10ml irradiation tube with a screw cap, dissolve 20mg of polyglutamic acid synthesized by microbial fermentation, and prepare an aqueous solution of polyglutamic acid with a concentration of 1% by weight; 60 Co is a γ-ray radiation source, and the aqueous solution of polyglutamic acid in the above-mentioned irradiation tube is irradiated under the protection of nitrogen, the radiation dose rate is 0.5kGy / hour, and the total radiation dose is 2kGy; the gel after irradiation is Fully swell at 2°C for 4 days, and replace the swelling medium water once a day to remove uncrosslinked monomers and impurities in the gel; freeze-dry in an ordinary vacuum dryer, and the vacuum degree is 12 hours to constant Heavy, that is, to obtain a super absorbent. After testing, the water absorption rate of the super absorbent is 90 times.

Embodiment 2

[0022] Add 2ml of deionized water to a 10ml irradiation tube with a screw cap, dissolve 80mg of polyglutamic acid synthesized by microbial fermentation, and prepare an aqueous solution of polyglutamic acid with a concentration of 4% by weight; 60 Co is a γ-ray radiation source, and the aqueous solution of polyglutamic acid in the above-mentioned irradiation tube was irradiated under the protection of nitrogen, the radiation dose rate was 1.2kGy / hour, and the total radiation dose was 40kGy; the gel after irradiation was Fully swell at 3°C ​​for 5 days, and replace the swelling medium water once a day to remove uncrosslinked monomers and impurities in the gel; freeze-dry in an ordinary vacuum dryer, and the vacuum degree is 18 hours to constant Heavy, that is, to obtain a super absorbent. After testing, the water absorption rate of the super absorbent is 480 times.

Embodiment 3

[0024] Add 2ml of deionized water to a 10ml irradiation tube with a screw cap, dissolve 120mg of polyglutamic acid synthesized by microbial fermentation, and prepare an aqueous solution of polyglutamic acid with a concentration of 6% by weight; 60 Co is a γ-ray radiation source, and the aqueous solution of polyglutamic acid in the above-mentioned irradiation tube is irradiated under the protection of nitrogen, the radiation dose rate is 1.0kGy / hour, and the total radiation dose is 10kGy; the gel after irradiation is Fully swell at 4°C for 6 days, replace the swelling medium water once a day to remove uncrosslinked monomers and impurities in the gel; freeze-dry in an ordinary vacuum dryer, the vacuum degree is 22 hours to constant Heavy, that is, to obtain a super absorbent. After testing, the water absorption rate of the super absorbent is 2100 times. figure 1 It is the real photos of the super water-absorbing agent in this example before and after water absorption. The weigh...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to the utilization of particle radiation to process the high molecular substance, especially for using the polyglutamic acid fermentation synthesized from microbe to prepare the absorbent agent. The operation steps comprises: preparing the water solution of polyglutamic acid fermentation synthesized from microbe in the percentage by weight of 1-10 %; utilizing the cobalt 60Co as the gamma radiation source to radiate on the solution prepared in the first step in the condition of nitrogen protection while the radiation dose rate is 0.5 kGy/hour-5.0kGy/hour and the tatl radiation dose is 2-150 kGy; The radiated gel will fully swell in 2-8 Deg. C for 4-8 days while the water as the swell-medium should be replaced one time one day to remove the un-crosslinking monomers and the impurities in the gel; and freezing and drying the gel in common vacuum drier until constant weight to attain the absorbent agent. Said invention has simple manufacturing process without environment pollution, stable property and higher water absorption ratio.

Description

technical field [0001] The technical scheme of the present invention relates to the treatment of macromolecular substances with particle radiation, specifically a method for preparing a super water-absorbing agent by treating polyglutamic acid synthesized by microbial fermentation with γ-ray radiation. Background technique [0002] γ-Polyglutamic acid (γ-PGA) is an extracellular viscous substance synthesized by microbial fermentation, which is formed by glutamic acid monomers bound by γ-peptide bonds. It is biodegradable, soluble in water, edible, non-toxic, has good biocompatibility, and is widely used in medicine, textile, food, cosmetics, environment, agriculture and other fields. [0003] Hydrogels are a class of substances that can absorb a large amount of water but cannot dissolve in water. Hydrophilic small molecules are able to diffuse in the hydrogel. Hydrogels have good biocompatibility. Compared with hydrophobic polymers, they have much weaker interactions with ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): A61L15/60
Inventor 宋存江刘静金映红曾猛陶剑郑承刚邓飞孙亚民王淑芳
Owner NANKAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap