Supercritical CO2 impregnation of α-tocopherol into PET/PP films for active packaging applications
Supercritical CO2 impregnation of α-tocopherol into PET/PP films for active packaging applications
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DOI：
10.1016/j.jcou.2019.06.012
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发表时间：
2019-12-01
影响因子：
7.7
通讯作者：
De Marco, Iolanda
中科院分区：
文献类型：
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作者：
Franco, Paola;Incarnato, Loredana;De Marco, Iolanda
采用超临界CO2浸渍技术将天然抗氧化剂α-生育酚（TOC）吸附在单层和多层PET/PP膜上，制备活性包装材料。超临界浸渍实验在17 MPa和40 ℃下进行，使用不同的载体：PP膜，PET膜（ut-PET），电晕放电处理的PET表面（ct-PET）膜，PET/PP膜。超临界二氧化碳（SC-CO2）浸渍显示是一种有效的技术，在实现活性包装膜。实际上，浸渍了非常高量的TOC（考虑到单层PP膜，高达3.2 mg（TOC）/cm（膜）（2），考虑到多层膜，高达2.66 mg（TOC）/cm（膜）（2））。场发射扫描电子显微镜（FESEM）显示了如何浸渍与TOC改性的膜表面（变得不均匀）。傅里叶变换红外光谱（FT-IR）揭示了存在于浸渍膜的TOC和聚合物的特征带。差示扫描量热法（DSC）表明，SC-CO2的存在下诱导的聚合物的结晶度百分比略有降低。此外，迁移的α-生育酚从包装膜中的食品模拟物进行了研究，使用紫外-可见光谱，和超临界浸渍的有效性，以获得控制释放的活性剂进行了验证。最后，抗氧化活性测试证实了其浸渍在单层和多层膜上后的TOC抗氧化能力的保存。
Supercritical carbon dioxide impregnation technique was used to adsorb alpha-tocopherol (TOC), a natural antioxidant, on monolayer and multilayer polyethylene terephthalate (PET)/polypropylene (PP) films to obtain active packaging. Supercritical impregnation experiments were performed at 17 MPa and 40 degrees C using different supports: PP films, PET films (ut-PET), corona discharge treated PET surface (ct-PET) films, PET/PP films. Supercritical carbon dioxide (SC-CO2) impregnation revealed to be an effective technique in the attainment of active packaging films. Indeed, very high amounts of TOC were impregnated (up to 3.2 mg(TOC)/cm(film)(2) considering a monolayer PP film and up to 2.66 mg(TOC)/cm(film)(2) considering a multilayer film). Field emission scanning electron microscopy (FESEM) showed how the impregnation with TOC modified the film surface (which became heterogeneous). Fourier transform infrared spectroscopy (FT-IR) revealed the presence in the impregnated films of both TOC and polymers characteristic bands. Differential scanning calorimetry (DSC) indicated that the presence of SC-CO2 induced a slight reduction in the crystallinity percentage of the polymers. Moreover, migration of alpha-tocopherol from the packaging films in a food simulant was studied using UV-vis spectroscopy, and the effectiveness of the supercritical impregnation to obtain the controlled-release of the active agent was verified. Finally, antioxidant activity tests confirmed the preservation of TOC antioxidant power after its impregnation on monolayer and multilayer films.