Chitosan (shrimp and crab shell) films
Antimicrobial film-forming polymer derived from crustacean shells; promising for active food films but still at lab and early-pilot stage with no scaled producer.
Other biopolymers
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Casein (milk protein) films and coatings
Water-soluble, biodegradable pellets made from milk protein; replaces PVA detergent-pod film, soluble sachets and some paper coatings.