College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, China.
ACS Appl Mater Interfaces. 2024 Nov 20;16(46):63964-63977. doi: 10.1021/acsami.4c09955. Epub 2024 Nov 6.
Currently, antimicrobial films with stable and efficient antibacterial activities are receiving considerable attention in the food packaging industry. Herein, a chemically/physically linked konjac glucomannan-sodium alginate (KGM-SA)@carbon nanotubes (CNTs)/Fe composite film with outstanding resistance to ultraviolet radiation, oxidation, and bacteria, as well as excellent photothermal effects and mechanical properties, was successfully prepared using a solvent flow method. Tannic acid-modified carboxyl-functionalized CNTs (TCCNTs), l-cysteine-modified carboxyl-functionalized CNTs (LCCNTs), and Fe were incorporated into the prepared film. The film structure of KGM-SA@CNTs/Fe was characterized using various methods, confirming the formation of a dual-cross-linked network through metal-coordination bonds and hydrogen bonding. This unique structure endowed the film with excellent water vapor permeability (3.58 g mm/m day kPa), water resistance (water contact angle = 93.66°), and thermal stability. Further, the film exhibited outstanding photothermal conversion efficiency and stability under near-infrared irradiation (300 mW/cm) as well as excellent bactericidal properties against and , achieving a bacterial inhibition rate of >99%. In a strawberry preservation experiment, the KGM-SA@CNTs/Fe composite film exhibited remarkable preservation effects, extending the shelf life of strawberries by 4-6 d. Thus, this photothermal antibacterial film offers a new approach for the application of CNTs in food packaging.
目前，具有稳定高效抗菌活性的抗菌薄膜在食品包装行业受到了广泛关注。在此，我们通过溶剂流法成功制备了一种具有优异抗紫外辐射、氧化和细菌能力、良好光热效应和力学性能的化学/物理交联魔芋葡甘聚糖-海藻酸钠（KGM-SA）@碳纳米管（CNTs）/Fe 复合薄膜。该薄膜中加入了单宁酸修饰的羧基功能化 CNTs（TCCNTs）、L-半胱氨酸修饰的羧基功能化 CNTs（LCCNTs）和 Fe。通过各种方法对 KGM-SA@CNTs/Fe 薄膜的结构进行了表征，证实了通过金属配位键和氢键形成了双重交联网络。这种独特的结构赋予了薄膜优异的水蒸气透过性（3.58 g mm/m day kPa）、耐水性（水接触角=93.66°）和热稳定性。此外，该薄膜在近红外辐射（300 mW/cm）下表现出优异的光热转换效率和稳定性，以及对 和 的优异杀菌性能，抑菌率>99%。在草莓保鲜实验中，KGM-SA@CNTs/Fe 复合薄膜表现出显著的保鲜效果，将草莓的货架期延长了 4-6 天。因此，这种光热抗菌薄膜为 CNTs 在食品包装中的应用提供了一种新方法。
