Method for inhibiting degradation of gamma-polyglutamic acid and gamma-polyglutamic acid water-retaining agent

A polyglutamic acid, degradation inhibitor technology, applied in chemical instruments and methods, agricultural machinery and implements, applications, etc., can solve problems such as reports that have not yet seen the degradation of γ-PGA and γ-PGA-based water-retaining agents, Achieve the effect of low cost, wide application prospect and simple production process

Active Publication Date: 2012-04-18
领先生物农业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

γ-PGA and γ-PGA-based water-retaining agents have outstanding advantages in biodegradability, but in some fields, the rapid degradation of γ-PGA or γ-PGA-based water-retaining agents affects their long-term performance. Therefore, Its degradation rate needs to be controlled to make it more suitable for its function in the corresponding field
[0007] Up to now, there have been no reports on inhibiting the degradation of γ-PGA and γ-PGA-based water-retaining agents at home and abroad.

Method used

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  • Method for inhibiting degradation of gamma-polyglutamic acid and gamma-polyglutamic acid water-retaining agent
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  • Method for inhibiting degradation of gamma-polyglutamic acid and gamma-polyglutamic acid water-retaining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1: Inhibitory effect of EDTA disodium salt on gamma-PGA degradation

[0060] The γ-PGA solution obtained by dissolving 2g of γ-PGA in 200ml of tap water was used as a control sample. γ-PGA in which 2% ethylenediaminetetraacetic acid disodium salt was added to γ-PGA was used as a test sample. A γ-PGA solution containing ethylenediaminetetraacetic acid disodium salt obtained by dissolving 2 g of a test sample in 200 ml of tap water was used as a test solution. The beakers containing the above two solutions were placed at room temperature (20-26° C.), and tap water was added therein every 5 days during the test to ensure that the volumes of the two solutions remained constant. At the same time, 1ml samples are regularly taken, the pH of these solution samples is the natural pH value, and these samples are stored at a temperature of -20°C to avoid further degradation by microorganisms, and these samples are analyzed at the same time, and the analysis method is as f...

Embodiment 2

[0064] Embodiment 2: the inhibitory effect of tartaric acid on gamma-PGA degradation

[0065] The γ-PGA solution obtained by dissolving 2g of γ-PGA in 200ml of tap water was used as a control sample. γ-PGA to which 2% of tartaric acid was added based on the weight of γ-PGA was used as a test sample. A γ-PGA solution containing tartaric acid obtained by dissolving 2 g of the test sample in 200 ml of tap water was used as a test solution. The beakers containing the above two solutions were placed at room temperature (20-26° C.), and tap water was added therein every 5 days during the test to ensure that the volumes of the two solutions remained constant. At the same time, 1ml samples are taken regularly, and the sampling time is from 0 days to 60 days. The pH of these solution samples is the natural pH value, and these samples are stored at a temperature of -20°C to avoid continued degradation by microorganisms. Sample is analyzed, and its analytical method is with embodiment ...

Embodiment 3

[0067] Example 3: Disodium ethylenediaminetetraacetic acid inhibits the degradation of γ-PGA-based water retaining agent

[0068] The preparation process of γ-PGA based water retaining agent is as follows:

[0069] γ-PGA, polypropylene glycol diglycidyl ether cross-linking agent and polyethylene glycol were dissolved in water to prepare 9.2% γ-PGA by weight, 4.6% polypropylene glycol diglycidyl ether cross-linking agent, 9.2% polyethylene glycol For the solution of diol, use hydrochloric acid as the reaction catalyst, and use hydrochloric acid to adjust the pH value of the reaction system to 5.0. The reaction system is reacted at a temperature of 60° C. for 36 hours, and the contents of the reaction system are pulverized into a paste with a pulverizer. Then dry it at a temperature of 50-55° C., and then crush it into 60-mesh particles, so as to obtain a gamma-PGA-based water-retaining agent.

[0070] Mix the prepared γ-PGA water-retaining agent dry powder with 2% ethylenediam...

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Abstract

The invention provides a degradation inhibitor of a gamma-polyglutamic acid and a gamma-polyglutamic acid water-retaining agent and an application method thereof, wherein after the gamma-polyglutamic acid or the gamma-polyglutamic acid water-retaining agent product is dried and ground, edetic acid disodium salt or tartaric acid and other degradation inhibitors are added, the mixture is added intoa light-proof and airtight composite material wrapper, is vacuum sealed and is stored at a drying low temperature position, the degradation time of the gamma-polyglutamic acid or the derivatives thereof is prolonged from 5 days to 6 months in the solution state, the degradation time is prolonged above 35 times, and the quality guarantee period of the product can reach above 24 months.

Description

【Technical field】 [0001] The invention belongs to the technical field of biopolymer materials. More specifically, the present invention relates to a method for inhibiting the degradation of γ-polyglutamic acid or γ-polyglutamic acid-based water retaining agent. 【Background technique】 [0002] Biosynthetic γ-polyglutamic acid (γ-polyglutamic acid, γ-PGA) is a polymer compound formed by condensation of α-amino group and γ-carboxyl group through amide bond. Its molecular weight is 50000-2000000Da. Degree 500-50000, it is a water-soluble, biodegradable polymer material obtained by microbial fermentation. The structural formula of γ-PGA is as follows: [0003] [0004] γ-PGA-based water-retaining agent is a polymer compound with a network structure produced by γ-PGA and polyalcohol glycidyl ether under the catalysis of a catalyst. γ-PGA and γ-PGA-based water-retaining agent have good biocompatibility and are a kind of excellent environment-friendly polymer materials. They ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/04C08K5/17C08K5/092C08K5/098C09K17/18C09K101/00
Inventor 朱瑞艳杨娜徐美娜高玉爽徐志文
Owner 领先生物农业股份有限公司
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