| Degradable and edible films have increasingly become the hot pintsof food package field in recent years. However, the disadvantage ofsingle-ingredient films have confined their applications on food storage,that’s why multi-ingredients films have been developed to solve thisproblem. Thus, the study and application of composite films havebecome the current development trend. The study has been focused onchitosan-kudzu starch films, including the development and optimizationof the composite films and its physical properties as well as applications.1. Optimized the chitosan-kudzu starch films by the Response SurfaceMethod and built the regression equation of the three composites(chitosan, kudzu starch and glycerol) on the influence of composite films.The study has successfully developed the new films and discussed theeffects of components of the mixture on the tensile strength, elongationof rupture, water vapor permeability (WVP), opacity and color of thefilms. The results displayed that the composite films showed the bestproperties on the composition of1.5%kudzu starch,1.29%chitosan and24.27%glycerol.2. Applied the chitosan-kudzu starch, combined with NaClOdisinfection on the storage of Chinese Water Chestnut(CWC) andconducted research on their quality preservation. Results showed thatCWC applied by composite films had displayed better physiology andbiochemistry indicator than the CK group, by25days preservation, theinspiration rate was only85%of CK group, the brittleness and firmness offruits decreased less, the pericarp and pulp electricity rate were64.88%and76.07%of CK group, and restrained the POD activity efficiently, thusdisplaying better effects on the CWC preservation. 3. Further explored the application of composite films on fresh-cutCWC. Filmed fresh-cut CWC have been stored under4℃to test theirquality index; to improve the improvement of fresh-cut CWC, the PEfilms and hot-sealed bag have been used as outer packages. Resultsshowed that composite films combined with NaClO disinfectiondisplayed better effects: its rotting rate were11.5%(PE films) and11.0%(hot sealed bags), its weight loss were the least in all the groups, TSSwere7.21, higher than the unfilmed groups. As for the two packagematerials, hot sealed bag performed better in decreasing rotting rate,water loss rate, respiration and could slow down the decrease of TSS. PEfilms and hot sealed bag didn’t show much difference in the change ofcolor, electric conductivity and POD activity.The results provide statistical and theoretic support for the industrialproduction and application for the new composite film: chitosan-kudzustarch films. |
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