Abstract
In the present study, an anti-bacterial film (Carr/POM film) was prepared through the incorporation of Wells-Dawson polyoxometalate K6[Mo18O62P2] into κ-carrageenan-based polymers using the tape-casting method. The mechanical properties, thermal stability, and morphology of the prepared film were characterized. The obtained results showed that incorporation of K6[Mo18O62P2] significantly affected the morphology and structure of the films. Moreover, the polyoxometalate-based film demonstrated desirable bactericidal activity against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive). Carr/POM (@8 mg/mL) film resulted in an obvious inhibition zone around the film in Kirby-Bauer disk diffusion test, which could also remove 99% of S. aureus and E. coli on plastic, glass, and stainless steel. In addition, this anti-bacterial film also demonstrated good biodegradability, which could be decomposed in soil in around 1 week. In conclusion, the polyoxometalate-based film showed good anti-bacterial property against food-borne pathogenic microbes, suggesting the prepared film has great potential to be developed as promising food packaging.
Highlights
Materials and Methods κ-carrageenan and glycerol were obtained from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China) Polyoxometalate (K6 [Mo18 O62 P]) were synthesized according to the previous literature [25]
E. coli and S. aureus bacterial solution were inoculated dropwise on stainless steel, glass, and plastic respectively, and Carr/POM anti-bacterial film was applied onto the carrier surface for 30 min at 37 ◦ C
Further addition of polyoxometalate (8 mg/mL) resulted in a significant increase in the film thickness (* p < 0.05). This may be attributed to increases in solid content or the internal gap between the polymer chain and glycerol in the film matrix as a consequence of polyoxometalate incorporation [31]
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Reported that the κ-carrageenan/konjac glucomannan film containing 7% TiO2 nanoparticles showed an obvious anti-bacterial effect on Penicillium viridicatum, and the antibacterial rate reached 79%. S. aureus strains SR3605 and ATCC43300 among 76 tested POMs [19] In another trial, Inoue et al [20] reported Wells-Dawson polyoxometalates has stronger effects than. It is worth mentioning that besides its bactericidal activity, Wells-Dawson polyoxometalates showed great potential for food (especially the fruits and vegetables) preservation due to its inhibitory effects on enzymatic browning. Wells-Dawson polyoxometalates might be very promising anti-bacterial agents for food preservation. There is a notable paucity of literature describing the anti-bacterial films based on the Wells-Dawson polyoxometalates. In this study, research was carried out to prepare an anti-bacterial film by incorporating Wells-Dawson polyoxometalate. The anti-bacterial and degradation properties of the film were evaluated
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