The ChitoBioEngineering project aims at establishing, through genetic, metabolic and enzyme engineering, biotechnological ways of producing fully defined, partially acetylated chitosans. Today’s commercially available chitosans are produced chemically from chitin isolated from shrimp shell wastes. They can be well defined concerning their degree of polymerisation and degree of acetylation, but they are invariably characterised by a random pattern of acetylation. This project will solve this.