Department of Food Science and Technology, College of Agriculture, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
Department of Food Science and Technology, Faculty of Agriculture, Urmia University, P.O. Box 57561-51818, Urmia, Iran.
Carbohydr Polym. 2016 Sep 20;149:8-19. doi: 10.1016/j.carbpol.2016.04.089. Epub 2016 Apr 23.
Bacterial cellulose (BC) monolayer and multilayer films, incorporating 5wt.% ZnO nanoparticles (NPs) have been obtained. Ultrasound (US) irradiation (40kHz) was applied during ZnO-BC nanocomposites preparation. X-ray diffraction (XRD) patterns showed that ZnO NPs were crystallized in their pure phase. SEM scanning electron microscopy (SEM) results indicated that US treatment causes to decrease ZnO particle size, forming a stable hybrid nanostructure and evenly distributed ZnO NPs coated BC nanofibers. ZnO NPs enhanced the mechanical properties and diminished water vapor permeability and moisture absorption of BC films. Antibacterial activity of ZnO-BC films against Staphylococcus aureus was more than Escherichia coli. The antibacterial activity was enhanced with the utilization of US irradiation. The ZnO release was influenced by films composition; the multilayer and US treated films being promising in order to achieve controlled release of ZnO. Results suggest that ZnO-BC films may be used as controlled release antimicrobial food active packaging.
细菌纤维素 (BC) 单层和多层薄膜中加入了 5wt.% 的氧化锌纳米粒子 (NPs)。在制备 ZnO-BC 纳米复合材料的过程中，施加了超声 (US) 辐射 (40kHz)。X 射线衍射 (XRD) 图谱表明，ZnO NPs 以纯相结晶。扫描电子显微镜 (SEM) 结果表明，US 处理会导致 ZnO 颗粒尺寸减小，形成稳定的杂化纳米结构，并均匀分布 ZnO NPs 包覆的 BC 纳米纤维。ZnO NPs 提高了 BC 薄膜的机械性能，降低了水蒸气透过率和吸湿性。与大肠杆菌相比，ZnO-BC 薄膜对金黄色葡萄球菌的抗菌活性更强。抗菌活性随着 US 照射的利用而增强。ZnO 的释放受薄膜组成的影响；多层和经 US 处理的薄膜具有实现 ZnO 控制释放的潜力。结果表明，ZnO-BC 薄膜可用作控制释放抗菌食品活性包装。
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