Controlled-release antibacterial edible composite film and preparation method thereof

Abstract

The invention discloses a controlled-release antibacterial edible composite film and a preparation method thereof. Soy isolate protein serves as a main substrate, glycerin, pectin, nisin, sodium lactate and the like are added according to a specific proportion, so that antibacterial activity and the mechanical performance of the film are improved, and coating is performed for three times by the aid of ultrasound-assisted technology to prepare a controlled-release edible antibacterial protein composite film. The antibacterial activity of the composite film can be effectively improved by nisin-sodium lactate bacteriostatic agents, and microbe development is prevented. Release of the bacteriostatic agents can be effectively controlled by a multilayer film structure prepared by controlled-release technology, and the antibacterial activity of the film is greatly enhanced. The antibacterial activity of the antibacterial composite film slightly changes within two months during storage period, the mechanical performance also slightly changes, the diameter of an antibacterial ring is decreased by 10-15%, tensile strength is reduced by 3-9%, water permeability is enhanced by 2-7%, oxygen permeability is enhanced by 4-5.5%, the color of the film is transparent and does not remarkably change, and the effective period of food quality is prolonged. The composite film is simple to operate, stable and reliable in product quality and suitable for industrial production.

Description

technical field [0001] The invention provides a controlled-release antibacterial edible composite film and a preparation method thereof, more specifically relates to a soybean protein isolate / pectin / Nisin / sodium lactate composite antibacterial packaging film and a preparation method thereof, belonging to the technical field of food packaging. Background technique [0002] Among all kinds of packaging materials, plastic is widely used in food packaging due to its superior performance and low cost. However, plastic packaging is stable in nature, and it is not easy to decompose and rot when discarded in the environment after use. Long-term storage may easily cause environmental pollution. At present, the application of artificial synthetic films is being challenged from the aspects of safety and environmental protection. Edible packaging films have become a research trend because of their higher safety and environmental protection. The development of edible coatings and films f...

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to solve the problem that the edible protein film prepared in the field of food packaging research at home and abroad has poor antibacterial properties when storing and packaging food, which eventually leads to a significant decrease in the shelf life of packaged food, which limits the application of edible protein film in the food packaging industry. common problems

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