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A kind of chitosan derivative containing quaternary ammonium nitrogen atom and guanidine group and its preparation method and application

A technology of chitosan derivatives and quaternary ammonium nitrogen, which is applied in the fields of application, food science, food preservation, etc., and can solve problems such as limiting the prospects of chitosan

Inactive Publication Date: 2016-02-10
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This greatly limits the prospect of chitosan as an edible food preservation coating

Method used

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  • A kind of chitosan derivative containing quaternary ammonium nitrogen atom and guanidine group and its preparation method and application

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Embodiment 1

[0022] The preparation method of the chitosan derivative that contains quaternary ammonium nitrogen atom and guanidine group comprises following several parts: (1) prepare the chitosan derivative that contains guanidine group with dimethylaminopropylamine and dimethyl cyanamide under isopropanol environment Intermediate Product 1. (2) React intermediate product 2 and epichlorohydrin in methanol solution to prepare intermediate product 2 containing quaternary ammonium nitrogen atom and guanidine group. (3) react intermediate product 2 with chitosan to prepare chitosan derivatives containing quaternary ammonium nitrogen atom and guanidine group. (4) The obtained chitosan derivative is dissolved in a glycerol solution to prepare a fresh-keeping coating, and the specific parameters of the reaction are as follows.

[0023] Step 1. Dissolve 60 grams of 3-dimethylaminopropylamine in 200 mL of isopropanol, add 21 grams of dimethylcyanamide and 60 mL of 35% hydrochloric acid, and reac...

Embodiment 2

[0030] The present invention also includes a food fresh-keeping coating, which is prepared by dissolving the above-mentioned chitosan derivatives containing quaternary ammonium nitrogen atoms and guanidinium in 1% to 3% glycerol aqueous solution by mass ratio, which contains quaternary ammonium nitrogen The content of chitosan derivatives of atoms and guanidine groups is 1%-3% by mass.

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Abstract

The invention relates to a chitosan derivative containing quaternary ammonium nitrogen atoms and guanidyl, which is a novel chitosan derivative generated through chemical modification. A preparation method of the chitosan derivative comprises the following steps: by taking a chitosan product with the degree of deacetylation of 50-80% as a raw material, sequentially grafting quaternary ammonium salt and guanidyl to a chitosan framework through an epoxy group to obtain a chitosan derivative with quaternary ammonium nitrogen atoms and guanidyl; washing and dehydrating by acetone; and finally placing the solid material in a vacuum drier and drying at 40-100 DEG C till the water content of the material is less than 0.5-10%. Due to introduction of quaternary ammonium nitrogen atoms and guanidyl, the antibacterial ability and the water solubility of the chitosan derivative are remarkably improved. Finally, the chitosan derivative is dissolved in glycerol aqueous liquor with certain concentration to prepare food preserving paint.

Description

technical field [0001] The chitosan derivative containing quaternary ammonium nitrogen atom and guanidine group involved in the present invention is a novel chitosan derivative in terms of biochemistry. technical background [0002] Chitosan, whose chemical name is β-(1→4)-2-amino-2-deoxy-D-glucose, is formed by deacetylation of chitin and is the second most abundant biological polysaccharide resource in the world. At the same time, chitosan also has the property of being tasteless and is a good edible fresh-keeping material. However, because the hydrogen bond between chitosan molecules is still relatively strong, its solubility in neutral or alkaline solutions is very small. This greatly limits the prospect of chitosan as an edible food preservation coating. Aiming at this problem, people have proposed various schemes to modify and modify chitosan, and the main modification and modification methods are as follows. (1) Acylation: The O-acylation reaction occurs between th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08A23L3/3562
Inventor 唐喆桑伟许琦余晓红仓辉
Owner YANCHENG INST OF TECH