School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009 Anhui, P. R. China.
Anhui Institute of Agro-Products Intensive Processing Technology, Hefei, 230009 Anhui, P. R. China.
J Agric Food Chem. 2021 Jan 27;69(3):1068-1078. doi: 10.1021/acs.jafc.0c06961. Epub 2021 Jan 15.
Nowadays, films with antibacterial activity and applied for freshness monitoring by colorimetric response have been drawing growing attention in food packaging. However, the development of versatile antibacterial and colorimetric agents is still highly desirable. Herein, WO nanorods are incorporated in a polyvinyl alcohol (PVA) matrix to develop a novel composite film with photothermal antibacterial activity and freshness monitoring faculty. The interaction between WO nanorods and PVA is due to hydrogen bonds. Compared with the PVA film, the presence of WO nanorods can significantly enhance the mechanical and barrier properties; typically, the target film (WO/PVA) shows an increase in tensile strength by 52.7% and Young's modulus by 400.0% and a decrease in oxygen permeability by 72.4% and water vapor permeability by 66.9%. The films demonstrate a WO content-dependent antibacterial activity. Under irradiation of near-infrared light (NIR808), the synergistic effect of physical damage, oxidative stress, and temperature increase markedly improves the antibacterial activity of (WO/PVA), showing an antibacterial efficiency of ∼90% against or beyond 90% against . The incorporated WO nanorods demonstrate lower cytotoxicity toward the model cells of human colon cancer cell line HT-29. The (WO/PVA) film exhibits colorimetric response to HS and can also be used for pork freshness monitoring as an indicator.
如今，具有抗菌活性并可通过比色响应应用于新鲜度监测的薄膜在食品包装领域受到越来越多的关注。然而，多功能抗菌和比色试剂的开发仍然是非常需要的。在此，WO 纳米棒被掺入聚乙烯醇（PVA）基质中，以开发具有光热抗菌活性和新鲜度监测功能的新型复合薄膜。WO 纳米棒与 PVA 之间的相互作用是由于氢键。与 PVA 薄膜相比，WO 纳米棒的存在可以显著提高力学和阻隔性能；具体而言，目标薄膜（WO/PVA）的拉伸强度提高了 52.7%，杨氏模量提高了 400.0%，氧气透过率降低了 72.4%，水蒸气透过率降低了 66.9%。该薄膜表现出 WO 含量依赖性的抗菌活性。在近红外光（NIR808）照射下，物理损伤、氧化应激和温度升高的协同效应显著提高了（WO/PVA）的抗菌活性，对 或超过 90%的 抗菌效率达到约 90%。掺入的 WO 纳米棒对人结肠癌细胞系 HT-29 的模型细胞表现出较低的细胞毒性。（WO/PVA）薄膜对 HS 表现出比色响应，也可用作猪肉新鲜度监测的指示剂。
