摘要
纳米粒子添加到复合涂膜中可提高涂膜对新鲜果蔬的保鲜效果,但也可能导致迁移。为探究纳米粒子的迁移行为及其对果蔬采后品质的影响,将纳米ZnO(ZnO nanoparticles,ZnO NPs)与羧甲基纤维素钠(sodium carboxymethyl cellulose,CMC)复合后对采后红橘进行涂膜,考查了ZnO NPs质量分数、粒径和贮藏温度对涂膜中Zn元素向果皮和果肉中迁移行为的影响,并测定了各组红橘在贮藏期间的品质、抗氧化酶活性和总抗氧化能力。结果表明,复合涂膜处理的红橘果皮中Zn含量在涂膜8 h内迅速增加,并在1~13 d缓慢升高至稳定。增加ZnO NPs质量分数或提高红橘贮藏温度,均会使果皮中的Zn含量增加,但ZnO NPs粒径的影响不显著,且果肉中的Zn含量无显著变化。同时,涂膜处理可在贮藏后期抑制果实的呼吸作用,进而降低果实的腐烂率。涂膜可在一定程度上提高果皮的抗氧化酶活性和总抗氧化能力,但并未发现Zn的迁移对其有显著影响。研究从纳米粒子迁移的角度探究了纳米复合涂膜与采后果蔬的相互作用,为进一步明确其保鲜机理以及减少安全风险奠定了基础。
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.
作者
高燕利
徐丹
任丹
吴习宇
GAO Yanli;XU Dan;REN Dan;WU Xiyu(College of Food Science,Southwest University,Chongqing 400700,China)
出处
《食品与发酵工业》
CAS
CSCD
北大核心
2020年第15期154-161,共8页
Food and Fermentation Industries
基金
国家自然科学基金面上项目(31772028)
中央高校基本科研业务费重点项目(XDJK2020B042)。
关键词
纳米氧化锌
红橘
迁移
涂膜
采后品质
nano zinc oxide
tangerine
migration
coatings
post-harvest quality
