Fresh, raw and wet foods lose quality fast as microorganisms, mould and oxidation attack their colour, smell, texture and shelf life. From Vietnamese shrimp by-products, Vietnam Food Joint Stock Company (VNF) develops chitosan — a natural polysaccharide derived from chitin — as a preservation solution for raw, fresh and wet pet food. In VNF trials, chitosan sharply reduced microbial and mould counts and helped extend shelf life, giving pet-food makers a way to protect quality while reducing their reliance on synthetic additives.