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Production of environmentally benign poly(hydroxybutyrate)/silver bionanocomposites reinforced with ZnO for active packaging of bread

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Abstract

The aim of the present work was to prepare poly(hydroxybutyrate) (PHB)-based active food packaging film with antimicrobial potential. For the sake of develo** such film, PHB silver nanocomposites (PHB/Ag) were synthesized biologically using rice-washed water as substrate for Cupriavidus necator. These nanocomposites were further incorporated with varying concentrations of zinc oxide (ZnO) nanoparticles (1, 2, 3 and 4%), and thin films were obtained by solvent casting. Their morphological, thermal, mechanical, water barrier and antimicrobial properties were examined by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), tensile testing, water vapor permeability (WVP), and agar well diffusion assay, respectively. After the overall analysis, PHB/Ag-ZnO at 3% was designated as the optimized film. This film showed remarkable antimicrobial potential against tested food-borne pathogens i.e., Escherichia coli (E. coli, Gram-negative bacterium), Staphylococcus aureus (S. aureus, Gram-positive bacterium), and Aspergillus niger (A. niger, fungal strain). With this context, the above-selected film was used to check the shelf-life of a bread sample for 10 days of storage. The findings of the study evidenced that PHB/Ag-ZnO 3% extended the shelf-life of packaged bread up to 5–8 days. Thus, the present research work demonstrates that our prepared film has prolonged the shelf-life of packaged food and carries significant potential for active food packaging.

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Acknowledgements

This work was funded by the Seed Grant Money (No. DPA-I/32/22/MRP/2358-2500) received from Kurukshetra University, Kurukshetra.

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Authors and Affiliations

  1. Laboratory of Fermentation Technology, Department of Microbiology, Kurukshetra University, Haryana, India

    Mahak Mittal & Neeraj K. Aggarwal

  2. Department of Chemistry, Kurukshetra University, Haryana, India

    Simran Ahuja & Sanjiv Arora

  3. Department of Biotechnology, Kurukshetra University, Haryana, India

    Anita Yadav

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  1. Mahak Mittal
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Correspondence to Neeraj K. Aggarwal.

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Mittal, M., Ahuja, S., Yadav, A. et al. Production of environmentally benign poly(hydroxybutyrate)/silver bionanocomposites reinforced with ZnO for active packaging of bread. Iran Polym J 33, 787–798 (2024). https://doi.org/10.1007/s13726-024-01294-w

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