Welle Frank, Franz Roland
Fraunhofer Institute for Process Engineering and Packaging (IVV), Giggenhauser Strasbe 35, 85354 Freising, Germany.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess. 2008 Jun;25(6):788-94. doi: 10.1080/02652030701704755.
The barrier effect of a silicon oxide (SiOx) coating on the inner surface of PET bottles, in terms of the ability to reduce the migration of post-consumer compounds from the PET bottle wall into food simulants (3% acetic acid and 10% ethanol), was investigated. The barrier effect was examined by artificially introducing model substances (surrogates) into the PET bottle wall to represent a worst-case scenario. Test bottles with three different spiking levels up to approximately 1000 mg kg(-1) per surrogate were blown and coated on the inner surface. The SiOx-coated bottles and the non-coated reference bottles were filled with food simulants. From the specific migration of the surrogates with different bottles wall concentrations, the maximum surrogate concentrations in the bottle wall corresponding to migration of 10 microg l(-1) were determined. It was shown that the SiOx coating layer is an efficient barrier to post-consumer compounds. The maximum bottle wall concentrations of the surrogates corresponding to migration of 10 microg l(-1) were in the range of 200 mg kg(-1) for toluene and approximately 900 mg kg(-1) for benzophenone. Consequently, the SiOx coating allows use of conventionally recycled post-consumer PET flakes (without a super-clean recycling process) for packaging aqueous and low alcoholic foodstuffs (under cold-fill conditions) and protects food from migration of unwanted contaminants from post-consumer PET.
研究了聚对苯二甲酸乙二酯（PET）瓶内表面氧化硅（SiOx）涂层的阻隔效果，即其减少消费后化合物从PET瓶壁迁移到食品模拟物（3%乙酸和10%乙醇）中的能力。通过人工将模型物质（替代物）引入PET瓶壁来模拟最坏情况，以此检验阻隔效果。吹塑了三种不同加标水平（每种替代物最高约1000 mg kg⁻¹）的测试瓶，并在内表面进行了涂层处理。将涂有SiOx的瓶子和未涂覆的参比瓶装满食品模拟物。根据不同瓶壁浓度替代物的特定迁移情况，确定了瓶壁中对应于10 μg l⁻¹迁移量的最大替代物浓度。结果表明，SiOx涂层对消费后化合物是一种有效的阻隔层。对应于10 μg l⁻¹迁移量的替代物在瓶壁中的最大浓度，甲苯为200 mg kg⁻¹左右，二苯甲酮约为900 mg kg⁻¹。因此，SiOx涂层允许使用常规回收的消费后PET薄片（无需超净回收工艺）来包装水性和低酒精食品（在冷灌装条件下），并保护食品免受消费后PET中有害污染物迁移的影响。
