Phothisarattana Danaya, Wongphan Phanwipa, Promhuad Khwanchat, Promsorn Juthathip, Harnkarnsujarit Nathdanai
Department of Packaging and Materials Technology, Faculty of Agro-Industry, Kasetsart University, 50 Ngam Wong Wan Rd., Latyao, Chatuchak, Bangkok 10900, Thailand.
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.
Colloids Surf B Biointerfaces. 2022 Jun;214:112472. doi: 10.1016/j.colsurfb.2022.112472. Epub 2022 Mar 23.
Biodegradable polymers typically have inferior barrier properties compared to petroleum-based nonbiodegradable plastic. The addition of zinc oxide nanoparticles may enhance the functional properties of biodegradable packaging and extends the shelf life of packaged foods. Polybutylene adipate-co-terephthalate (PBAT) and thermoplastic starch (TPS) blended ZnO (1-5%) nanocomposite films were developed via blown extrusion for functional active meat packaging. The nanocomposite film morphology showed agglomeration of the nanoparticles, causing poor mechanical properties. Nanovoids formed at the interface between the polymer and nanoparticles, increasing permeability. Dispersion of ZnO nanofillers modified CO and C-O ester bonding in PBAT and increased hydrogen bonding with TPS. The interaction between ZnO and polymers increased the dispersion and reduced the agglomeration of nanoparticles. The highest ZnO content at 5% resulted in a stronger interaction between ZnO and TPS due to increased amorphous starch content, which improved homogeneous dispersion within the matrices, reducing nanoparticle size. The ZnO nanocomposite films reduced lipid oxidation and delayed microbial growth, resulting in a lower total viable count, lactic acid bacteria and yeast and mold in packaged pork meat. Higher ZnO concentrations from 3% showed microbial inhibitory effects. The growth of microorganisms was controlled by residual oxygen, morphology of the films and nanoparticle characteristics. The nanocomposite films effectively extended the shelf life by more than 3 days under refrigerated conditions.
与石油基非生物可降解塑料相比，生物可降解聚合物的阻隔性能通常较差。添加氧化锌纳米颗粒可能会增强生物可降解包装的功能特性，并延长包装食品的保质期。通过吹塑挤出法制备了聚己二酸丁二醇酯-对苯二甲酸丁二醇酯（PBAT）与热塑性淀粉（TPS）共混的含1%-5%氧化锌（ZnO）的纳米复合薄膜，用于功能性活性肉类包装。纳米复合薄膜的形态显示出纳米颗粒的团聚，导致机械性能较差。在聚合物与纳米颗粒的界面处形成了纳米空洞，增加了渗透性。ZnO纳米填料的分散改变了PBAT中的羰基（CO）和碳-氧酯键，并增加了与TPS的氢键作用。ZnO与聚合物之间的相互作用增加了纳米颗粒的分散性并减少了团聚。5%的最高ZnO含量由于无定形淀粉含量的增加，导致ZnO与TPS之间的相互作用更强，这改善了其在基体中的均匀分散，减小了纳米颗粒的尺寸。ZnO纳米复合薄膜降低了脂质氧化并延缓了微生物生长，使包装猪肉中的总活菌数、乳酸菌以及酵母菌和霉菌数量降低。3%及以上的较高ZnO浓度显示出微生物抑制作用。微生物的生长受残余氧气、薄膜形态和纳米颗粒特性的控制。在冷藏条件下，纳米复合薄膜有效地将保质期延长了3天以上。
