纳米ZnO/LDPE食品包装膜及食品模拟物中ZnO含量的测定  

Quantification of ZnO in nano ZnO/LDPE food packaging films and food simulant

作　　者：史迎春[1] 胡长鹰[2,3] 黄金宇[4] 

机构地区：[1]暨南大学包装工程研究所,广东珠海519070 [2]暨南大学,食品科学与工程系,广东广州510632 [3]广东普通高校产品包装与物流重点实验室,广东珠海519070 [4]广东出入境检验检疫局检验检疫技术中心,广东广州510623

出　　处：《食品与发酵工业》2017年第3期229-233,共5页Food and Fermentation Industries

基　　金：国家自然科学基金(31571762,21277061);国家质检总局科技项目(2014IK078)

摘　　要：建立了微波消解/电感耦合等离子体原子发射光谱(inductively coupled plasma atomic emission spectrometer,ICP-AES)及电感耦合等离子质谱仪(inductively coupled plasma mass spectrometer,ICP-MS)对纳米氧化锌/低密度聚乙烯(纳米Zn O/LDPE)薄膜及食品模拟物中Zn O含量的检测方法。根据EU10/2011选择30 g/L乙酸及超纯水为食品模拟物,将纳米Zn O/LDPE薄膜在40℃下浸泡10 d,测定食品模拟物中的Zn O含量。结果表明:Zn在0.03~100μg/L及0.1~5 mg/L的浓度范围内线性关系良好,相关系数不低于0.999 8,在低、中、高3个水平进行加标实验,加标回收率在91.2%~110.2%之间,相对标准偏差(RSD,n=6)为0.3%~6.8%,方法在消解液、30 g/L乙酸及超纯水的检出限(LOD)分别为0.015 mg/L,0.03 mg/L及0.03μg/L,方法的定量限(LOQ)分别为0.05 mg/L,0.1 mg/L及0.1μg/L,方法精密度好,灵敏度高,定性定量准确。采用该方法测得,实验室3种自制纳米复合薄膜中Zn O含量分别为(4.71±0.19),(9.20±0.49)及(12.87±0.33)g/kg,在40℃10 d后,3%乙酸(w/v)食品模拟物中Zn O的含量分别为(2.35±0.02),(3.54±0.01)及(4.12±0.35)mg/kg,在水食品模拟物中Zn O的含量分别为(24.65±0.68),(24.80±1.25)及(45.85±0.32)μg/kg。Zinc oxide （ZnO） was determined in nano-zinc oxide food packaging and food simulants by microwave digestion with inductively coupled plasma atomic emission spectrometry （ICP-AES） and inductively coupled plasma mass spectrometry （ICP-MS）. According to the European Union regulation （EU 10/2011 ）, 3% acetic acid was cho- sen and ultrapure water was used as food simulants, the test was carried out at 40 ℃ for 10 days. The amount of ZnO in food simulant was analyzed by ICP-AES and ICP-MS. The results showed the calibration curve of Zn was linear in the range of 0. 1 -5 mg/L with correlation coefficients no less than 0. 9998. The spiked recoveries at three spiked levels were in the range of 91.2% - 110.2% with relative standard deviations （RSD） of 0.3% -6. 8%. The limit of detection （LOD） was 0. 015 mg/L, 0.03 mg/L and 0.03 μg/L respectively; the limit of quantitation （LOQ） was 0.05 mg/L, 0. 1 mg/L and 0. 1 μg/L respectively. This method was precise, highly sensitive and accurate. This method was applied in determination of nano ZnO amount in three types of film and result was （4.71 ±0.19） g/kg, （9.20 ±0.49） g/kg and 12.87 ±0.33 g/kg respectively. The amount of nano ZnO in 3% acetic acid food simulates at 40 ℃ for 10 days was （2.35 ±0.02） mg/kg, （3.54 ±0.01） mg/kg and （4. 12 ±0. 35） mg/kg respectively; the amount of nano ZnO in ultrapure water simulate at 40℃ for 10 days was （24.65 ±0. 68）μg/kg,2（4. 80 ± 1.25） μg/kg and （45.85 ±0. 32） μg/kg, respectively.

关 键 词：纳米氧化锌 低密度聚乙烯 微波消解 电感耦合等离子体原子发射光谱 电感耦合等离子质谱 

分 类 号：TS206.4[轻工技术与工程—食品科学]