纳米氧化锌低密度聚乙烯膜中锌向食品的迁移研究
目的 研究纳米氧化锌/低密度聚乙烯膜(low density polyethylene film, LDPE)中锌(Zn)向食品的迁移行为, 探究其迁移规律。方法 选取2种食品模拟物(3%乙酸及超纯水)及真实食品(食用白醋及瓶装水), 在3种不同实验温度下(70、40及20 ℃), 研究锌向食品模拟物的迁移规律。采用扫描电子显微镜(scanning electron microscope, SEM)和原子力显微镜(atomic force microscope, AFM)表征纳米ZnO/LDPE膜的表面形貌。 结果 锌向酸性模拟物中的迁移率远远大于水性模拟物中的迁移率, 其中锌向酸性模拟物中的最大迁移率分别为22.7%, 20.3%及18.6% (ZL-1, ZL-2 及ZL-2#), 向水性模拟物中的最大迁移率分别为9.9%, 5.7%及4.9%(ZL-1, ZL-2 及ZL-2#); 锌向酸性食品的迁移量(1.59~5.03 mg/g)同样高于向水性食品的迁移量(2.98~24.60 μg/g); 随着纳米ZnO的初始含量变大迁移率变小; 而偶联剂的加入对锌的迁移有一定的抑制作用。随着纳米ZnO浓度的增加, 在薄膜中观察到纳米ZnO的不规则形貌。结论 纳米ZnO/LDPE膜不适合在高温下包装食物, 且其在酸性食品中的安全隐患高于水性食品。
Objective To investigate the migration behavior of zinc (Zn) into foods in nano ZnO/low density polyethylene (LDPE) films and explore the migration mechanism. Methods Two food simulants (3% acetic acid and ultrapure water) and real food (white vinegar and bottled water) were selected. At 3 different experimental temperatures (70, 40, and 20 ℃), the migrations of zinc into food simulants were investigated. Surface morphology of nano ZnO/LDPE films were observed by scanning electron microscope (SEM) and atomic force microscope (AFM). Results The mobility in the zinc-acidic simulants was much greater than that in the water-based simulants, the maximum migration rates in the zinc-to-acid simulants were 22.7%, 20.3% and 18.6%, respectively (ZL-1, ZL-2 and ZL-2#), and the maximum migration rates to water-based simulants were 9.9%, 5.7% and 4.9%, respectively (ZL-1, ZL-2 and ZL-2#). The migration of zinc to acidic food (1.59-5.03 mg/g) was also higher than the migration to water-based food (2.98-24.60 μg/g). With the increase of the initial content of nano-ZnO, the mobility became smaller, and the addition of coupling agent had a certain inhibitory effect on the migration of zinc. With the increase of nano-ZnO concentration, irregular morphology of nano-ZnO was observed in the film. Conclusion The nano-ZnO/LDPE film is not suitable for packaging food at high temperatures, and its safety risk in acidic food is higher than that in water-based food.
标题：纳米氧化锌低密度聚乙烯膜中锌向食品的迁移研究
英文标题：Migration of ZnO from nano ZnO/ low density polyethylene film into food
作者：
史迎春 黑龙江省瑞科检测技术有限公司
胡长鹰 暨南大学食品科学与工程系;广东普通高校产品包装与物流重点实验室
中文关键词:纳米氧化锌,低密度聚乙烯,食品模拟物,迁移,
英文关键词:nano zinc oxide,low density polyethylene,food simulants,migration,
发表日期：2018-04-27
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