基于醋酸纤维素的氨敏薄膜，掺入 Co-BIT 微晶用于智能包装应用。
Ammonia-sensitive cellulose acetate-based films incorporated with Co-BIT microcrystals for smart packaging application.
机构信息
Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China.
Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China.
出版信息
Carbohydr Polym. 2023 Sep 15;316:121045. doi: 10.1016/j.carbpol.2023.121045. Epub 2023 May 23.
Nowadays, there is an increasing demand for smart packaging materials capable of effectively monitoring the food freshness. In this study, new Co-based MOF (Co-BIT) microcrystals with ammonia-sensitivity and antibacterial function were constructed and then loaded within cellulose acetate (CA) matrix to create smart active packaging materials. The influences of Co-BIT loading upon structure, physical, and functional properties of the CA films were then thoroughly explored. It was observed that microcrystalline Co-BIT was uniformly integrated inside CA matrix, which caused significant promotions in mechanical strength (from 24.12 to 39.76 MPa), water barrier (from 9.32 × 10 to 2.73 × 10 g/m·h·Pa) and ultraviolet light protection performances of CA film. Additionally, the created CA/Co-BIT films displayed striking antibacterial efficacy (>95.0 % for both Escherichia coli and Staphylococcus aureus), favorable ammonia-sensitivity function as well as color stability. Finally, the CA/Co-BIT films were successfully applied for indicating the spoilage of shrimp through discernible color changes. These findings suggest that Co-BIT loaded CA composite films have great potential for use as smart active packaging.
如今，人们对能够有效监测食品新鲜度的智能包装材料的需求日益增加。在本研究中，构建了具有氨敏性和抗菌功能的新型 Co 基 MOF（Co-BIT）微晶，然后将其负载于醋酸纤维素（CA）基质中，以制备智能活性包装材料。然后深入探讨了 Co-BIT 负载对 CA 薄膜结构、物理和功能特性的影响。结果表明，微晶 Co-BIT 均匀地集成在 CA 基质中，这显著提高了 CA 薄膜的机械强度（从 24.12 到 39.76 MPa）、水阻隔性（从 9.32×10 到 2.73×10 g/m·h·Pa）和紫外线防护性能。此外，所制备的 CA/Co-BIT 薄膜表现出显著的抗菌功效（对大肠杆菌和金黄色葡萄球菌的抑菌率均大于 95.0%）、良好的氨敏性功能和颜色稳定性。最后，CA/Co-BIT 薄膜成功应用于通过可识别的颜色变化指示虾的腐败。这些发现表明，负载 Co-BIT 的 CA 复合薄膜在智能活性包装方面具有很大的应用潜力。
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