Professor Wang Hualin, School of Chemistry and Chemical Engineering, Hefei University of Technology, Team: Near-infrared Assisted WO3/PVA Antibacterial Living Film and Its Application in Freshness Monitoring

Original title: Professor Wang Hualin Team, School of Chemistry and Chemical Engineering, Hefei University of Technology: Near-infrared Assisted WO3/PVA Antibacterial Living Film and Its Application in Freshness Monitoring
Professor Wang Hualin Team, School of Chemistry and Chemical Engineering, Hefei University of Technology, published the article "Antiterbac" online in Journal of Agricultural and Food Chemistry The study by Activity of Polyvinyl Alcohol/WO3 Films Assisted by Near-Infrared Light and Its Application in Freshness Monitoring combines the co-antibacterial activity of WO3 nano rods with NIR assistance with color-response properties to H2S, providing new ideas for the design of active smart packaging. This article was published online January 15, 2021 by Journal of Agricultural and Food Chemistry. Professor Wang Hualin is the author of this paper.
research highlights
x hydrothermal legal system prepared WO3 nano rod, which showed lower cytotoxicity to
HT-29 cells; The
x WO3nm bar can significantly improve the regenerative and barrier properties of the film, the synergy effects of physical damage, oxidative stress and temperature increase under the irradiation of
x NIR808 can significantly improve the antibacterial activity of (WO3/PVA)4; and the 4 membrane of
(WO3/PVA) has color response to H2S and can be applied to the monitoring of pork freshness.
Antibacterial packaging
, represented by active packaging, can inhibit the growth of corruption and pathogenic microorganisms by incorporating antimicrobial agents into the polymer substate. On the other hand, food quality will always release sulfur or nitrogen-containing substances, these substances can easily be detected by color reaction, through visual color changes in real time to monitor the freshness of food, color indicators are often considered a convenient intelligent packaging material. Therefore, the development of multi-functional films with antibacterial activity and color method to monitor freshness has attracted more and more attention. Inorganic antimicrobials have better stability and longer shelf life under a variety of conditions than organic antimicrobials. Many nano-powders, such as ZnO, MgO and CaO, are considered commercial fungicides due to their low cost and low toxicity. WO3 is an n-type semiconductor that has strong light absorption in the near-infrared (NIR) region, is capable of photothermal conversion, and exhibits co-antibacterial activity. Therefore, Professor Wang Hualin of the School of Chemistry and Chemical Engineering of Hefei University of Technology used NIR808 and WO3 nano rods to produce co-antibacterial activity. WO3 nanocrystalline films have been used in gas-sensitive applications, including H2S, CO and NO2, and due to the oxidation properties of WO3, it can easily react with H2S, which makes WO3 a color-sensitive reaction in meat freshness monitoring applications. In addition, WO3 is non-toxic and can be safely used as a food packaging material. Here, PVA is used as a thin film substrate, combined with WO3 nanostrates, to develop a new composite film with photothermal antibacterial activity and freshness monitoring capabilities. In addition to characterizing the shape and structure of the film, the thermodynamic, mechanical and barrier properties of the film are also studied. The antibacterial activity assisted by near-infrared radiation and its application in pork freshness monitoring were studied. This method combines the co-antibacterial activity of WO3nm bar with NIR assistance with the color response characteristics of H2S, and provides a new idea for the design of active intelligent packaging.
results
hydrothermal synthesis WO3 is uniform rod, 20 to 80 nm in diameter and a few microns in length. WO3 has low cytotoxicity and is more than 90% cellularly active even at high concentrations (50 μg/mL). Compared to pure PVA films, (WO3/PVA) 2-4 composite film TS and YM increased significantly. This is due to the enhancement of the well-dispersed WO3 nano-bar-induced polymer substate and the hydrogen bonding between the WO3 and PVA substations. Compared with pure PVA film, the OP and WVP of (WO3/PVA) 2-4 composite film decreased significantly. This is because hydrogen bonds limit the diffusion of molecules, while WO3 nano rods extend the diffusion path of gas molecules. Under NIR808 irradiation, the synergy effects of physical damage, oxidative stress and temperature increase significantly increased (WO3/PVA)4's antibacterial activity, E. coli's antibacterial efficiency by 90% and St. The antibacterial efficiency of aureus is > 90%. (WO3/PVA)4 After 30 minutes of exposure to H2S, the color of the membrane changes from gray to blue and black. This is due to the redox reaction that occurs between H2S and WO3, resulting in a black W2S. At the same time, protons and electrons are injected into the lattice to form blue tungsten bronze (HxWO3). (WO3/PVA)4 as a monitor of pork freshness, 36 h, the color of the color film from gray-white to blue-black, the corresponding TVB-N is 25.40 mg/100g (H2S concentration of 0.10 mg/L).
Author
Wang Hualin Professor Wang
, Ph.D., Professor, Hefei University of Technology, Ph.D. Mentor. The main research direction involves functional polymer and its composite materials, the field of agricultural product processing and storage, pay attention to the relationship between molecular table interface behavior and structure, and obtain a series of important research results in food active packaging and comprehensive utilization of agricultural by-products. He presided over research projects such as the National Natural Science Foundation of China, the Small and Medium Enterprises Innovation Fund of the Ministry of Science and Technology, and major science and technology projects in Anhui Province. In recent years, in J. Agric. Food Chem.、Food Hydrocolloid.、Carbohyd. Polym., Food Chem. and other important academic journals published more than 50 academic research papers.
Master's degree
Wang Wei, female, 2018 Master's degree in the School of Chemistry and Chemical Engineering, Hefei University of Technology, the research direction is inormeric nanoparticles / biomass-based polymer compound antibacterial food packaging film. During the school period, excellent performance, many times won the school scholarship.
article was published online by Antibacterial Activity of Polyvinyl Alcohol/WO3 Filmsed By Near-Infrared Light and Its Application in Freshness Monitoring.