Edible packaging: alternative film for frozen fish

The SeaFilm project is developing a food packaging that aims to create a substitute for single-use plastic film used for frozen fish. The film is based on bioactive seaweed extracts and edible algae, which is claimed to help to conserve frozen seafood for longer while maintaining the quality.

Developed by researchers from the Polytechnic University of Leiria in Portugal, the concept of edible biofilm for frozen fish came about as a solution that was in line with the European Union’s commitment to ban the use of single-use plastics.

After the frozen fish is defrosted, the biodegradable film can either be disposed of or eaten along with the fish. The film could even include seasonings for the fish.

The new material could be used as an alternative to plastic and help to differentiate seafood products, reduce food waste and cut the amount of single-use plastics used in the production process.

The film has been validated for shelf life extension in frozen salmon, significantly reducing freezer burn. Recent results also indicated that it might extend the shelf life of seafood after defrosting by delaying microbial growth.

For most species tested, the researchers found that the development of microorganisms was delayed after thawing. The combination of the alginate-based biofilm and the seaweed extract can help to conserve seafood while maintaining the quality.

Following the results with salmon, the industry has asked the team to produce biofilms for other species such as cod and hake.

The solution was supported by the European Maritime and Fisheries Fund.

Image credit: iStock.com/Merrimon