| 摘要: |
| 目的 探究温度、时间、食品模拟物、材料结构及添加剂分子等对聚丙烯中3种紫外线吸收剂迁移的影响。方法 建立3种紫外线吸收剂(UV-P，UV-531，UV-327)的高效液相色谱检测方法。再在20，40，70 °C下，研究添加剂向5种食品模拟物的迁移。结果 添加剂在0.1～20 μg/mL内线性良好(R>0.99)，检出限为0.03～0.05 μg/mL。加标含量为每克塑料中添加20，80，200 μg紫外线吸收剂时，回收率为81.6%～99.8%，相对标准偏差为2.3%～7.7%。在体积分数为10%的乙醇和质量分数为3%的乙酸溶液中，未检出添加剂；在体积分数为20%的乙醇溶液中，只检测到UV-P；在体积分数为50%的乙醇溶液和异辛烷中，3种紫外线吸收剂均被检测到。结论 升高温度、延长时间，紫外线吸收剂迁移量逐渐增加直到平衡；紫外线吸收剂易于向异辛烷和乙醇溶液迁移，乙醇溶液中，随着乙醇含量的增加，发生迁移的添加剂种类和质量也随之增加；紫外线吸收剂的迁移量随着聚丙烯材料结晶度的增加而减小；添加剂的分子量越大、结构越复杂，越不容易发生迁移。 |
| 关键词: 聚丙烯 食品包装 紫外线吸收剂 迁移 |
| DOI： |
| 分类号:TB484.3 |
| 基金项目:国家自然科学基金（21277061，21277085，31571762） |
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| Migration of Ultraviolet Absorbers in Polypropylene Materials with Different Structures |
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LI Bo1,2, WANG Zhi-wei1,2, LIN Qin-bao1,2, HU Chang-ying3,4
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1.Packaging Engineering Institute of Jinan University, Zhuhai 519070, China;2.Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes, Zhuhai 519070, China;3.1.Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes, Zhuhai 519070, China;4.2.Department of Food Science and Engineering, Jinan University, Guangzhou 510632, China
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| Abstract: |
| The work aims to study the influence of temperature, time, food simulant, material structure and additive molecule on the migration of three kinds of ultraviolet absorbers in polypropylene. A high-performance liquid chromatography was developed for three kinds of ultraviolet absorbers (UV-P, UV-531 and UV-327). Additionally, the migration of additive to five kinds of food simulants at 20, 40 and 70 ℃ was studied. The additive showed good linearity in the range of 0.1～20 μg/mL and the limits of detection ranged from 0.03～0.05 μg/mL. When the standard substance added was at concentration of 20, 80 and 200 μg/g, the recovery rate was 81.6%～99.8% with relative standard deviations ranging from 2.3% to 7.7%. No additives were detected in the solution with 10% (volume fraction) ethanol and 3% (mass fraction) acetic acid. Only UV-P was detected in the 20% ethanol solution(volume fraction). All three ultraviolet absorbers were detected in the 50% ethanol solution(volume fraction) and isooctane. With increased temperature and prolonged time, the migration amount of ultraviolet absorbers gradually increases till balanced. The ultraviolet absorbers are inclined to migrate to isooctane and ethanol solution. In the ethanol solution, the kinds and amount of the migrated additives increase with the increase of the ethanol content. The migration amount of ultraviolet absorber decreases with the increase of the crystallinity of polypropylene materials. As for the additive with higher molecular weight and more complicated structure, it is more difficult to migrate. |
| Key words: polypropylene food packaging ultraviolet absorber migration |
