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. 2025 Aug 15;15(1):29935.
doi: 10.1038/s41598-025-13936-x.

Study on the preparation, characterization, and antibacterial properties of keggin POMs functionalized carrageenan composite films

Anxing Wang  1   2 , Mengqi Wang  1   2 , Yu Zhang  1   2 , Qing Zhang  1   2 , Guojun Yuan  3   4
Affiliations

Study on the preparation, characterization, and antibacterial properties of keggin POMs functionalized carrageenan composite films

Anxing Wang et al. Sci Rep. .

Abstract

A composite antimicrobial film (Carrageenan/Polyoxometalate, Carr/POM) was prepared by doping Keggin-type polyoxometalate Na3PW12O40 into carrageenan using the casting method. The mechanical properties, thermal stability, surface morphology, structure, antimicrobial activity and biodegradability of the films were systematically investigated. The results showed that the incorporation of Na3PW12O40 enhanced the water resistance of the carrageenan film and significantly impacted the surface morphology and crystal structure of the film. In antibacterial tests, the Carr/POM film exhibited strong bactericidal activity against Staphylococcus aureus(S.aureus), with the Carr/POM-4 film demonstrating the strongest inhibitory effect, corresponding to an inhibition zone diameter of 10.58 mm.In addition, the Carr/POM films showed excellent biodegradability, with complete decomposition occurring in soil within approximately one week.These findings suggest that the prepared films possess excellent antimicrobial properties against foodborne pathogenic microorganisms, making them promising candidates for further application in the field of food packaging.

Keywords: Antimicrobial; Carrageenan; Films; Polyoxometalate.

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Conflict of interest statement

Declarations. Competing interests: The authors declare no competing interests. Conflict of interest: The authors declare no conflict of interest.

Figures

Fig. 1
Fig. 1
Effect of Na3PW12O40 Concentration on Carr/POM Thickness.
Fig. 2
Fig. 2
Morphology of pure carrageenan film and Carr/POM films incorporated with Na3PW12O40 at different concentrations.
Fig. 3
Fig. 3
FT-IRspectroscopy of pure carrageenan film and Carr/POM films incorporated with Na3PW12O40 at different concentrations.
Fig. 4
Fig. 4
SEM micrographs of pure carrageenan film and Carr/POM films incorporated with Na3PW12O40 at different concentrations.
Fig. 5
Fig. 5
TG (A) and DTG (B) curves of pure carrageenan film and Carr/POM films incorporated with Na3PW12O40 at different concentrations.
Fig. 6
Fig. 6
XRD curves of pure carrageenan film and Carr/POM films incorporated with Na3PW12O40 at different concentrations.
Fig. 7
Fig. 7
The representative images of bacteriostatic circle of Carr/POM anti-bacterial films against E. coli (A) and S. aureus(B).
Fig. 8
Fig. 8
Degradation of Carr and Carr/POM-4 film in soil.
See this image and copyright information in PMC

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