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<p>Fossil-based packaging materials pose significant environmental challenges due to their persistence and carbon footprint, resulting in pollution and long-term climate change. Here we develop bioplastic packaging alternatives (films and trays) from protein-rich microbial biomass with glycerol as the plasticizer. The microbial biomass demonstrated excellent film-forming properties through compression molding, and the final materials exhibited good mechanical properties and excellent gas barrier properties - an average oxygen permeability coefficient of 0.33 cm<sup>3 </sup>mm m<sup>-2</sup> day<sup>-1</sup> atm<sup>-1</sup> at 50% relative humidity and 23 °C. The oxygen barrier properties highlight these microbial biomass materials as a promising, sustainable alternative to fossil-based synthetic films like EVOH, which are widely used in multilayer food packaging. Beyond offering a microplastic-free solution, the protein-rich materials present an opportunity to mitigate microplastic pollution at the end of their lifecycle. The current results position bioplastics based on microbial biomass as a critical step forward in addressing environmental sustainability challenges with current commercial packaging materials.</p>

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High oxygen barrier packaging materials from protein-rich single-celled organisms

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月6日

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  • Kiran Reddy Baddigam,
  • Bor Shin Chee,
  • Elodie Guilloud,
  • Chaitra Venkatesh,
  • Helena Koninckx,
  • Kim Windey,
  • Margaret Brennan Fournet,
  • Mikael Hedenqvist,
  • Anna J. Svagan

摘要

Fossil-based packaging materials pose significant environmental challenges due to their persistence and carbon footprint, resulting in pollution and long-term climate change. Here we develop bioplastic packaging alternatives (films and trays) from protein-rich microbial biomass with glycerol as the plasticizer. The microbial biomass demonstrated excellent film-forming properties through compression molding, and the final materials exhibited good mechanical properties and excellent gas barrier properties - an average oxygen permeability coefficient of 0.33 cm3 mm m-2 day-1 atm-1 at 50% relative humidity and 23 °C. The oxygen barrier properties highlight these microbial biomass materials as a promising, sustainable alternative to fossil-based synthetic films like EVOH, which are widely used in multilayer food packaging. Beyond offering a microplastic-free solution, the protein-rich materials present an opportunity to mitigate microplastic pollution at the end of their lifecycle. The current results position bioplastics based on microbial biomass as a critical step forward in addressing environmental sustainability challenges with current commercial packaging materials.