The invention discloses a preparation method of denatured
starch special for a
preservative material. The preparation method comprises the following steps: by taking
starch as a
raw material, carrying out oxidation reaction; then adding an unsaturated
organic acid monomer or
chitin and a derivative thereof for
grafting and crosslinking reaction so as to introduce a group with a
preservative function, so that the denatured
starch, which has the characteristics of good antibiotic property, film-forming property, low gelatinization temperature and the like, special for the
preservative material is obtained. According to the invention, the content of the preservative functional group of the denatured starch is more than 2%, the
moisture absorption and preservation property of the denatured starch is more than 20%, and the
minimum inhibitory concentration (MIC) of the denatured starch is less than 0.1%. A preservative flexible
package material produced by using the denatured starch can give the characteristics of antibiotic property, wettability,
water resistance, air permeability and the like to a flexible
package material, is environmentally-friendly and is used for preservation of lychee and other
fruits and vegetables, the preservative period is prolonged by 4-6 days, and good fruit rate is improved by 20-30%. The preparation method is suitable for production of denatured starch special for preservative materials based on the original
wetting method or semi-dry method process
route and equipment.