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Application of polyethyleneimine-cellulose composite gel

A technology of polyethylenimine and composite gel, which is applied in applications, chemicals for biological control, biocides, etc., can solve problems such as limited use scenarios, achieve the effect of inhibiting spoilage, and effectively prevent and control rice blast and melon blight

Active Publication Date: 2022-07-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its insoluble properties in water, the use scenarios are limited

Method used

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  • Application of polyethyleneimine-cellulose composite gel
  • Application of polyethyleneimine-cellulose composite gel
  • Application of polyethyleneimine-cellulose composite gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Preparation of oxidized cellulose

[0026] Configure 100ml of 70wt% sulfuric acid aqueous solution, put 10g corncob cellulose into the sulfuric acid aqueous solution, stir until the solution is transparent (about 30 minutes), add 10 times of water to dilute and centrifuge to remove the supernatant, collect the hydrolyzed cellulose and wash with water . Sampling and drying, the yield of hydrolyzed cellulose was determined according to the gravimetric method to be 55%. Take the cellulose hydrolyzate, dilute it to 5% (w / w), add sodium periodate to react at a reaction time of 1-7h, pH 2-8, feed ratio: 0.5:1-5:1, and then add The reaction was terminated by ethylene glycol, and the oxidized cellulose was obtained by dialysis and freeze-drying after taking out.

[0027] Feed ratio (reaction time 3h, pH 6), oxidation reaction time (pH 4, feed ratio 1.5:1), pH (reaction time 3h, feed ratio 1.5:1) three reaction conditions and the relationship between aldehyde group ...

Embodiment 2

[0028] Example 2: Preparation of polyethyleneimine-cellulose composite gel

[0029] Mix 5wt% polyethyleneimine (molecular weight 70000Da, pH 7) solution with 5wt% oxidized cellulose (pH 7) in volume ratios of 0.5:1, 1:1, 1.5:1 and 2:1, and inject with a pore size of The hydrogel was formed in a 9mm, 6mm height PDMS mold hole. All groups were gelatinized within 1 minute and left for 12h to fully gelatinize before taking out the hydrogel and immersing it in sterile water for equilibrium.

Embodiment 3

[0030] Example 3: Preparation of polyethyleneimine-cellulose composite gel

[0031] Mix 10wt% polyethyleneimine (molecular weight 10000Da, pH 7) solution with 3wt% carboxymethyl cellulose (pH 7) in volume ratio 0.5:1, 1:1, 1.5:1 and 2:1, add 0.1 wt% N-hydroxysuccinimide (NHS) and 0.1 wt% carbodiimide (EDC) were injected into a PDMS mold hole with a pore diameter of 9 mm and a height of 6 mm to form a hydrogel. All groups were gelled after being placed at room temperature for 12 hours, and then the hydrogels were taken out and immersed in sterile water for equilibrium.

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Abstract

The invention discloses an application of a polyethyleneimine-cellulose composite gel, and the polyethyleneimine-cellulose composite gel is mainly prepared by killing Magnaporthe grisea, Mycosphaerella mellonis, Penicillium fungus, Alternaria alternata, Pythium sp, Saccharomyces cerevisiae, and the like. The polyethyleneimine-cellulose composite gel has the advantages that the polyethyleneimine-cellulose composite gel can be used for preparing the polyethyleneimine-cellulose composite gel, and the polyethyleneimine-cellulose composite gel can be used for preparing the polyethyleneimine-cellulose composite gel; the composite gel can prevent and treat rice blast and melon gummy stem blight, and can also be used for preventing fruit and vegetable rot caused by penicillium, alternaria alternata, pythium aphanidermatum and saccharomyces cerevisiae. The polyethyleneimine-cellulose composite gel is prepared from the following components: 1 to 10 weight percent of cellulose derivatives (namely oxidized cellulose and carboxymethyl cellulose) and 1 to 10 weight percent of polyethyleneimine. The two compounds are prepared through one of an amidation reaction and a Schiff base reaction. As the compound is almost non-toxic to animal cells, the compound has relatively good human body safety when being used as a plant antibacterial agent and a fruit and vegetable preservative.

Description

technical field [0001] The invention relates to the use of polyethyleneimine-cellulose composite gel, which belongs to the application field of antibacterial agents. Background technique [0002] Cellulose is a widely used natural biomass, which is considered as an inexhaustible natural chemical raw material due to its relative environmental friendliness and excellent biocompatibility. However, due to its insoluble property in water, the usage scenarios are limited. The preparation of cellulose into a hydrogel will give it water dispersibility and surface activity, so cellulose-based hydrogels are favored by many researchers. [0003] Polyethyleneimine (PEI) is a polycationic antibacterial agent, which is polymerized from cycloethylamine and is an organic macromolecule with high positive charge content. Its molecular structure can be divided into linear polyethyleneimine ( L-PEI) and branched polyethyleneimine (B-PEI). PEI has a protonated amino nitrogen atom every two ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/04A01N33/04A01P3/00C08J3/075C08L79/02C08L1/28A23B7/154
CPCA01N25/04A01N33/04C08J3/075A23B7/154C08J2379/02C08J2401/28C08J2301/28C08J2479/02Y02A50/30
Inventor 孟琴沈冲吴升冬卢丹肖海峰
Owner ZHEJIANG UNIV
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