Preparation and performance of chitosan/purple yam anthocyanin/ZnO nanoparticles composites as pH-responsive smart films
A type of smart composite packaging film consisting of chitosan(CS),purple yam anthocyanin extract(PYE),ZnO nanoparticles(NPs)was prepared,and the effects of addition amounts of ZnO NPs on the mechanical properties,thermal stability,water vapor barrier performance,and antioxidant properties of the composite films were in-vestigated.The results indicated that the synergistic effect of ZnO NPs and PYE resulted in a significant improvement in the tensile strength,thermal stability,antioxidant properties,and vapor barrier performance of the composite films.When 2 wt%ZnO NPs were added,the resultant composite film exhibited an increase in the tensile strength from 26.58 to 41.79 MPa along with a slight decrease in the elongation at break.Its initial decomposition temperature also increased from 256.12 to 271.41℃,but its water vapor transmission rate decreased by about 17%.In addition,the addition of ZnO NPs enhanced the antioxidant and antimicrobial properties of the composite film.In practical application,this com-posite film exhibited pH sensitivity,and it could visually detect a change in the quality of shrimp during storage through a change in color,providing a facile method for food safety monitoring.
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