Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, PR China.
Qiongtai Normal University, Haikou 571127, PR China.
Int J Biol Macromol. 2024 Oct;277(Pt 3):134376. doi: 10.1016/j.ijbiomac.2024.134376. Epub 2024 Jul 31.
Smart packaging material capable of real-time monitoring of food freshness is essential for ensuring food safe. At present, colorimetric ammonia-sensing smart film often possesses issues with complicated production, high cost, and inferior long-term colour stability. Herein, Zinc‑copper bimetallic organic framework (ZnCu-BTC, BTC = 1,3,5-benzenetricarboxylate acid) nanorods with colorimetric ammonia-responsiveness were synthesized by adopting facile aqueous solution method, which were then explored as nano inclusions in potato starch/polyvinyl alcohol (PS/PVA) composite film towards developing high-performance smart packaging material. The results demonstrated that the introduction of ZnCu-BTC nanorods within PS/PVA brought about remarkable improvement in blend compatibility, accompanied by a boost in tensile strength to 47.2 MPa, as well as enhanced ultraviolet (UV) blocking efficacy (over 95.0 %). Additionally, the barrier properties of PS/PVA film against water vapor and oxygen were fortified due to the addition of ZnCu-BTC. More importantly, the developed PS/PVA/ZnCu-BTC nanocomposite film displayed satisfactory antibacterial activity (over 99 %) against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), favorable colorimetric ammonia-sensing ability, and long-term colour stability. The ZnCu-BTC incorporated PS/PVA nanocomposite film could grant real-time detection of prawn freshness decline via remarkable colour change, indicating vast promise for smart food packaging applications.
用于实时监测食品新鲜度的智能包装材料对于确保食品安全至关重要。目前，比色氨传感智能薄膜通常存在生产复杂、成本高和长期颜色稳定性差等问题。在此，通过采用简便的水溶液法合成了具有比色氨响应性的锌铜双金属有机骨架（ZnCu-BTC，BTC=1,3,5-苯三甲酸）纳米棒，并将其作为纳米颗粒掺入马铃薯淀粉/聚乙烯醇（PS/PVA）复合薄膜中，以开发高性能智能包装材料。结果表明，ZnCu-BTC 纳米棒的引入显著改善了 PS/PVA 的共混相容性，同时使拉伸强度提高到 47.2 MPa，并增强了对紫外线（UV）的阻隔效果（超过 95.0%）。此外，由于添加了 ZnCu-BTC，PS/PVA 薄膜对水蒸气和氧气的阻隔性能也得到了增强。更重要的是，所开发的 PS/PVA/ZnCu-BTC 纳米复合材料薄膜对大肠杆菌（E. coli）和金黄色葡萄球菌（S. aureus）表现出良好的抑菌活性（超过 99%）、良好的比色氨传感能力和长期颜色稳定性。ZnCu-BTC 复合的 PS/PVA 纳米复合材料薄膜可以通过显著的颜色变化实时检测对虾新鲜度的下降，这表明其在智能食品包装应用方面具有广阔的应用前景。
