Abstract
Active films based on sodium caseinate (SC) were fabricated via the casting method; these films were reinforced with zinc oxide nanoparticles (ZnO NPs) and rosemary essential oil (REO). The films’ optical, mechanical, and barrier and antimicrobial properties were evaluated. Further characterization was done using SEM, XRD, and FTIR spectroscopy. The results disclosed that the incorporation of ZnO NPs and REO into the SC matrix significantly improved the mechanical and barrier properties as well as moisture resistance of the SC film. The simultaneous incorporation of ZnO NPs and REO considerably reduced the water vapor permeability (WVP) of the films but increased their flexibility and strength. The microscopic and spectroscopic characterization revealed that the additives were highly compatible with the SC film matrix given the formation of uniform and homogeneous composite films. The nanocomposite films also exhibited noteworthy antimicrobial activity against the tested bacteria. In summary, this type of biopolymer-based active film can be considered as a promising material for food packaging applications.
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Abbreviations
- SEM:
-
Scanning electron microscopy
- XRD:
-
X-ray diffraction
- FTIR:
-
Fourier transform infrared
- WVP:
-
Water vapor permeability
- ZnO:
-
Zinc oxide
- NPs:
-
Nanoparticles
- SC:
-
Sodium caseinate
- REO:
-
Rosemary essential oil
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The authors are grateful to Maragheh University of Medical Sciences for funding this work.
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Alizadeh-Sani, M., Moghaddas Kia, E., Ghasempour, Z. et al. Preparation of Active Nanocomposite Film Consisting of Sodium Caseinate, ZnO Nanoparticles and Rosemary Essential Oil for Food Packaging Applications. J Polym Environ 29, 588–598 (2021). https://doi.org/10.1007/s10924-020-01906-5
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DOI: https://doi.org/10.1007/s10924-020-01906-5