Arumsari Rosi Andini, Wongphan Phanwipa, Harnkarnsujarit Nathdanai
Department of Packaging and Materials Technology, Faculty of Agro-Industry, Kasetsart University, 50 Ngam Wong Wan Rd., Latyao, Chatuchak, Bangkok 10900, Thailand.
Center for Advanced Studies for Agriculture and Food, Kasetsart University, 50 Ngam Wong Wan Rd., Latyao, Chatuchak, Bangkok 10900, Thailand.
Polymers (Basel). 2024 Nov 22;16(23):3237. doi: 10.3390/polym16233237.
The development of biodegradable active packaging is a relevant topic demanding the development of film properties, biodegradability, and the potential to preserve food quality. This study aimed to develop thermoplastic starch (TPS) blended with polybutylene adipate-co-terephthalate (PBAT) films via blown-film extrusion containing ascorbyl palmitate (AP) and sodium ascorbyl phosphate (SAP) as antioxidants. The morphology, mechanism, and barrier and antioxidant properties of the films were analyzed to determine the presence of AP, SAP, and their interaction effect on the film properties. SEM showed that increasing AP and SAP content increased fibrous-like morphology, improving the TPS dispersion. AP slightly decreased mechanical properties, while SAP increased the tensile properties and seal strength of the films. All of the YM values were increased by adding AP and SAP content. The addition of AP and SAP content enhanced the interaction with TPS/PBAT networks due to increasing C-O stretching of ester bonds, compatibility, and hydrophobicity of the polymer. Both water vapor and the oxygen barrier were insignificantly affected by AP and SAP up to 1%, while the permeabilities greatly increased at higher AP and SAP contents due to non-homogeneous and void spaces between the film matrix. TPS/PBAT containing AP and SAP (≥0.5%) effectively enhanced antioxidant capacity in 95% ethanol as a food simulant and reduced the UV light transmission of the films. Finding, the interaction between AP, SAP, and TPS/PBAT matrices effectively changed the microstructures and properties as functionalized antioxidant biodegradable packaging.
可生物降解活性包装的开发是一个相关主题，需要开发薄膜性能、生物降解性以及保持食品质量的潜力。本研究旨在通过吹膜挤出法制备含有抗坏血酸棕榈酸酯（AP）和抗坏血酸钠磷酸酯（SAP）作为抗氧化剂的热塑性淀粉（TPS）与聚己二酸丁二醇酯-对苯二甲酸丁二醇酯（PBAT）共混薄膜。分析了薄膜的形态、机理、阻隔和抗氧化性能，以确定AP、SAP的存在及其对薄膜性能的相互作用影响。扫描电子显微镜显示，增加AP和SAP含量会增加纤维状形态，改善TPS的分散性。AP略微降低了机械性能，而SAP提高了薄膜的拉伸性能和密封强度。通过添加AP和SAP含量，所有的杨氏模量值均有所增加。由于酯键的C-O伸缩、聚合物的相容性和疏水性增加，AP和SAP含量的添加增强了与TPS/PBAT网络的相互作用。在AP和SAP含量高达1%时，水蒸气和氧气阻隔性能受其影响不显著，而在较高的AP和SAP含量下，由于薄膜基质之间的不均匀和空隙，渗透率大大增加。含有AP和SAP（≥0.5%）的TPS/PBAT在作为食品模拟物的95%乙醇中有效地提高了抗氧化能力，并降低了薄膜的紫外线透过率。研究发现，AP、SAP与TPS/PBAT基质之间的相互作用有效地改变了微观结构和性能，使其成为功能化的抗氧化可生物降解包装。
