Brazilian Scientists Develop Fish Skin Biofilm for Sustainable Food Packaging

Researchers at the University of São Paulo and Eembrapa Pecuária Sudeste in Brazil have successfully converted Tambatinga fish skin into a biopolymer film for food packaging, presenting a novel use for aquaculture by-products. The study, published in Foods, highlights the potential of gelatin-based films derived from this hybrid Amazonian fish, known for its rapid growth and high yield.

The resulting films are characterized by their transparency, flexibility, and uniform surfaces, with impressive UV-blocking capabilities and lower water vapor permeability compared to conventional gelatin films. Paulo José do Amaral Sobral, a professor in the Department of Food Engineering at USP, emphasized the importance of developing biopolymer films to mitigate the environmental impact of synthetic packaging waste.

The production process involves cleaning the fish skins and extracting gelatin through a hot water-acid method, yielding a material rich in proline and hydroxyproline. However, the films are currently limited to dehydrated products due to their sensitivity to moisture.

The researchers noted that fish processing generates significant waste, with skins, heads, scales, and other by-products constituting up to 50% of the fish’s weight. While these residues are often repurposed for animal feed, fish skin presents a valuable source of collagen and bioactive peptides, which are increasingly sought after for biodegradable film applications.

This innovation aligns with broader trends in sustainable packaging, as seen in recent developments by materials scientists at MIT, who created biodegradable materials from fish offal suitable for various packaging needs. The ongoing research underscores the potential for transforming waste into functional materials, advancing both sustainability and food safety in the packaging industry.