CHITOSAN, KOJIC ACID AND CHLOROKOJIC ACID COMPOSITE BACTERIOSTATIC PRESERVATIVE FILM AND PREPARATION METHOD THEREFOR

摘要

Disclosed is a chitosan, kojic acid and chlorokojic acid composite bacteriostatic preservative film. The composite bacteriostatic preservative film at least comprises a first composite film and a second composite film stackingly disposed. The first composite film is a chitosan and kojic acid composite film, wherein the chitosan has a number-average molecular weight of 150 to 300 KDa and a degree of deacetylation equal to or greater than 90%. The second composite film is a chitosan and chlorokojic acid composite film, wherein the chitosan has a number-average molecular weight of 400 to 800 KDa and a degree of deacetylation equal to or greater than 85%. Further disclosed is a method for preparing the composite bacteriostatic preservative film. The chitosan, kojic acid and chlorokojic acid composite bacteriostatic preservative film according to the present invention has good film-forming and mechanical properties, a low water vapor permeability, and a good bacteriostatic activity, prevents a significant loss of food moisture content, and achieves excellent preservation of freshness.