Shrimp-shell film doubles shelf life of foods

Shrimp-shell film doubles shel...
Save those shells!
Save those shells!
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Save those shells!
Save those shells!

There's now potentially one more use for discarded shrimp shells. Already, scientists have used chitosan – a natural antibacterial polymer found in crustacean shells – as an ingredient in self-healing paint, proton-conducting transistors, and coatings that keep fruit fresh longer. Now, it turns out that chitosan can also be used to create a plastic film wrap that doubles the shelf life of some foods.

Chitosan itself is well-suited to the task, since besides being antibacterial it's also antifungal, non-toxic, and is easily formed into thin films.

Scientists at the National University of Singapore decided to boost such a film, however, by fortifying it with grapefruit seed extract. The extract likewise has antibacterial and antifungal properties, although it's also an antioxidant, antiseptic and anti-viral.

The composite film is claimed to be similar to regular synthetic polyethylene film in strength and flexibility, while also blocking the transmission of ultraviolet light – in so doing, it slows down the oxidation and photochemical deterioration of foods contained within it. In lab tests, bread samples wrapped in the film lasted twice as long as control samples wrapped in traditional film.

Once commercialized, the chitosan film could be a greener alternative to polyethylene, as it utilizes raw ingredients that would otherwise be discarded, it will biodegrade once it itself is discarded, and it should reduce food waste.

Source: National University of Singapore

Impressive as it is we should STOP BLOODY EATING SEAFOOD! We're overfishing to hell
David A Galler
Chitosan could also be useful in the pharmaceutical industry.
sounds like a good use of a waste product but one concern I would have is if the food service industry start using this to wrap up food could there be cross contamination that might negatively effect those with shellfish allergies.