A kind of carboxymethyl chitosan composite fresh-keeping film and preparation method thereof

Abstract

The invention discloses a carboxymethyl-chitosan compound fresh-keeping film and a preparation method thereof, and relates to the technical field of food packaging. The compound fresh-keeping film is prepared by the following raw materials according to mass percentage: 2% to 5% of carboxymethyl chitosan, 1% to 1.4% of glycerinum, 0.5% to 1% of paraffin, 0.5% to 0.8% of sodium trimetaphosphate, 0.1% to 0.5% of food-grade polysorbate-80, 0.05% to .2% of garlic essential oil, 0.15% to 0.3% of sorbic acid, 0.05% to 0.2% of silicon dioxide and 94.85% to 95.40% of distilled water; the preparation method comprises the following steps: firstly, preparing a fresh-keeping solution according to the mass percentages; secondly, coating the fresh-keeping solution on the surface of a film carrier; thirdly, stripping the film from the film carrier when the film is solidified to acquire the carboxymethyl-chitosan compound fresh-keeping film. The carboxymethyl-chitosan compound fresh-keeping film has the characteristics of high transparency, good flexibility, excellent retraction performance, low moisture-permeating rate and the like, so that the quality food can be improved obviously, the shelf life of food can be prolonged obviously, and the economic benefit is increased; besides, the carboxymethyl-chitosan compound fresh-keeping film has excellent biocompatibility with organisms, and the problem of residual toxicity does not exist.

Description

Technical field: [0001] The invention relates to the technical field of food packaging, in particular to a carboxymethyl chitosan composite fresh-keeping film and a preparation method thereof. Background technique: [0002] Plastic wrap is a kind of plastic packaging product, mainly used in refrigerator food preservation, fresh and cooked food packaging, etc., and has a wide range of applications in daily life. However, in the process of processing plastic wrap, in order to improve and enhance its application performance, various additives such as plasticizers, stabilizers and crosslinking agents are often added. The prepared plastic wrap is not only difficult to degrade, but also has certain harmful effects on organisms security risks. [0003] Carboxymethyl chitosan is a water-soluble chitosan derivative with rich sources, non-toxic and tasteless, and strong antibacterial properties. The film prepared from it has good gas selective permeability, which can effectively redu...

AI Technical Summary

Problems solved by technology

However, in the process of processing plastic wrap, in order to improve and enhance its application performance, various additives such as plasticizers, stabilizers and crosslinking agents are often added. The prepared plastic wrap is not only difficult to degrade, but also has certain harmful effects on organisms security risks

Images