Abstract: Incorporation of nanoparticles into composite coatings can improve the fresh-keeping effects on fresh fruits and vegetables,but it may also lead to migration. In order to investigate the migration behaviors of nanoparticles and their effects on the post-harvest quality of fruits and vegetables,composite coatings of ZnO nanoparticles (ZnO NPs) and sodium carboxymethyl cellulose (CMC) was applied on postharvest tangerine. And the effects of ZnO NPs mass fraction,particle size and storage temperature on the migration of Zn in the coatings to the peels and pulp were examined. The quality,antioxidant enzyme activities and total antioxidant capacity of each group during storage were then studied. The results showed that the Zn content in the tangerine peels treated by composite coatings increased rapidly within 8 h and slowly increased to stable in the following 1-13 d. And,increasing ZnO NPs mass fraction or storage temperature of tangerine increased the Zn content in the peel,but the particle size of ZnO NPs didn’t show a significant effect. Moreover,no significant change in Zn content in the pulp was observed. Furthermore,the coating treatment could inhibit the respiration rate of fruits in the later storage period,thereby reducing the rot rate of fruits. The coatings enhanced the antioxidant enzyme activities and the total antioxidant capacity of peels to some extent,but the effect of Zn migration was not significant. Therefore,this study explored the interaction of nano-composite coatings with post-harvest vegetables from the perspective of nanoparticle migration,laying a foundation for further clarifying the preservation mechanism of nano-composite coatings and reducing their safety risks.
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2020, Vol. 46 
