Edible squid skin gelatin composite film and preparation method thereof

Abstract

The invention discloses an edible squid skin gelatin composite film and a preparation method of the edible squid skin gelatin composite film. The preparation method is characterized by comprising the steps of sequentially soaking the cleaned squid skin by alkali and acid, extracting the gelatin by hot water, and carrying out enzymolysis on part of the gelatin to obtain gelatin peptide with low molecular weight; adding gelatin, chitosan, glycerin and the gelatin peptide with low molecular weight into a 0.15-0.25wt% acetic acid solution, wherein the mass of the gelatin is 2-4% of that of the acetic acid solution, mass of the chitosan is 1.5-2.5% of that of the acetic acid solution, mass of the glycerin is 0.05-0.15% of that of the acetic acid solution, and the mass of the gelatin peptide with low molecular weight is 0.2-0.4% of that of the acetic acid solution; evenly mixing the mixed solution in the water bath with 40-60 DEG C, and carrying out heat preservation for 4-6h; carrying out vacuum degassing to form a uniform transparent film liquid; pouring the film liquid onto a perspex sheet, and evenly spreading the film liquid by a film coater; standing still for 2-4h at the temperature of 40-60 DEG C, and then standing still overnight under the conditions of room temperature and the relative humidity of 40-60%; stripping the film from the perspex sheet to obtain the product. The edible squid skin gelatin composite film and a preparation method of the edible squid skin gelatin composite film have the advantages that the composite film integrates the functions of nutrition, antioxidation, antibiosis and the like, and the preparation method is simple and easy to operate.

Description

Technical field

[0001] The invention relates to the technical field of food packaging film processing, in particular to a squid skin gelatin edible composite film and a preparation method thereof. Background technique

[0002] Chemically synthesized plastic packaging is not easy to decompose and rot, causing serious "white pollution", which has become a worldwide environmental problem. With the improvement of people's requirements for food quality and preservation period, and the enhancement of environmental protection awareness, the development of edible packaging has become a research hotspot in the field of food packaging. Edible composite film refers to a film with a porous network structure formed by the interaction of different molecules with natural edible substances (such as polysaccharides, proteins, lipids, etc.) as raw materials, adding plasticizers, cross-linking agents and other substances , Can maintain the quality of food by preventing the migration of gas, water ...