Preparation method for chitosan nanometer preservation coating film material

Abstract

The invention discloses a preparation method for a chitosan nanometer preservation coating film material. The preparation method comprises the following steps that 1, an amphiphilic chitosan derivative is dissolved in water, stirring is performed, a hydrophilic chitosan derivative is added, stirring is performed, and a nano-particle blending solution is obtained; 2, the hydrophilic chitosan derivative is added in the nano-particle blending solution again to enable the total mass percentage of the hydrophilic chitosan derivative in the solution to be 1-3%, the solution is stirred evenly, and then the chitosan nanometer preservation coating film material is obtained. The preparation method is simple and easy to operate, and the prepared material is compact and uniform in formed film structure, higher in watertightness and antibacterial activity and good in mechanical strength, has the effects of inhibiting air exchanging of fruits and vegetables and reducing the breathing intensity, water evaporation and direct infection of pathogenic bacteria on the fruits and vegetables and the like in fruit and vegetable preservation and can reduce nutrient ingredient loss and improve the preservation effect.

Description

technical field [0001] The invention relates to the technical field of food fresh-keeping coating materials, in particular to a preparation method of a chitosan nano-preservation coating material. Background technique [0002] Coating fresh-keeping refers to coating the surface of fruits and vegetables with a film-forming substance with a very thin film by spraying, dipping, brushing, etc., so as to inhibit the gas exchange of fruits and vegetables, reduce the breathing intensity, and reduce the water content. Evaporation reduces the direct infection of pathogenic bacteria to fruits and vegetables, better maintains the freshness and hardness of fruits and vegetables, achieves the fresh-keeping technology that delays the spoilage of fruits and vegetables, and keeps fruits and vegetables fresh. Because of its simplicity, convenience, low cost, good effect, and easy promotion, it has become a relatively active research field at home and abroad. [0003] Nanomaterials are widel...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of chitosan nano-preservation coating material, to solve the relatively complex components of the existing nano-particle chitosan preservation coating material, poor film-forming structure due to uneven dispersion of nanoparticles, and poor performance in fresh-keeping. Poor water resistance, poor antibacterial effect, and rapid loss of nutrients during the process

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