Preparation method of chitosan crosslinking prolamine

Abstract

The invention discloses a preparation method of chitosan crosslinking prolamine and belongs to the technical field of new materials. The preparation method includes: using dry rice residues, wheat protein powder or corn protein powder and chitosan as the raw materials, preparing a prolamine solution, preparing a chitosan solution, preparing chitosan crosslinking prolamine reaction liquid, and preparing the yellowish-brown chitosan crosslinking prolamine copolymer with the crosslinking rate being 55-65%. The preparation method has the advantages that the chitosan is connected with the prolamine through glutaraldehyde forming Schiff base, and high crosslinking rate and good crosslinking stability are achieved; the crosslinking product is good in skin friendliness, antibacterial performance and thermo-forming performance; the crosslinking reaction is mild in condition, simple to operate, easy in raw material obtaining, low in production cost and environmentally friendly, and the prepared chitosan crosslinking prolamine is widely applicable to fields such as spinning, garments and food.

Description

[0001] 1. Technical field [0002] The invention belongs to the technical field of new materials, and in particular relates to a preparation method of chitosan cross-linked prolamin. [0003] 2. Background technology [0004] The new material industry is a strategic emerging industry that the country focuses on, and it is the foundation and guide for the development of all strategic emerging industries. The synthesis of new natural polymer composite materials that can replace petrochemical resources has become the focus and hotspot of research and development, and is one of the mainstream directions in the future development of the field of polymer materials, so it has very important urgency, science and application potential. [0005] Chitosan is the N-deacetylation product of chitin, and its structure is 2-acetylamino-2-deoxy-D-glucopyranose and 2-amino-2-deoxy-D-glucopyranose through β-(1, 4) Linear polymers linked by glycosidic linkages. Chitin and chitosan have many uniq...

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Problems solved by technology

[0008] Existing methods for preparing chitosan derivatives, such as the 2006 master thesis of Chongqing University "MTGase Catalyzed Synthesis and Characterization of Chitosan-Gelatin Copolymers", the method disclosed in this paper is to use commercially available crude microorganisms to transglutamate Amidase powder (MTGase) is used as a raw material. First, the commercially available crude MTGase is purified, and then the purified MTGase catalyzes the transglutamine reaction between the primary amino group of chitosan and the glutamine group of gelatin to cross-link. The disadvantages of this method Yes: ①Because MTGase is a protein, its catalytic conditions are limited, especially when the catalytic system contains inhibitors (or inactivators), which will greatly weaken the catalytic activity of the enzyme, so its cross-linking efficiency is poor; ② The price of the enzyme is relatively high, and the commercially available crude enzyme is used for purification and extraction, but the purification process is heavy and cumbersome, which is not conducive to industrialization

The disadvantages of this method are: ①Using ultrasonic-assisted cross-linking, the reaction is not easy to control, side reactions occur, and the microwave reactor is expensive, which can only be limited to small-scale synthesis in the laboratory, which is difficult for large-scale industrial production; ② The protein content in wheat gluten is about 70%, and it still contains a large amount of starch. After enzymatic hydrolysis of wheat gluten, there is still a large amount of starch that has not been utilized, which wastes a lot of resources; The disposal will increase the cost and cause pollution to the environment