Abstract: The present invention has, as object, biodegradable compositions consisting of starch, plasticising agent, proteins, a cross-linking enzyme and water; the process for obtaining said compositions; their use for producing biodegradable items, useful in particular for packaging food products, and the biodegradable items thus obtained. In particular, such composition, which is normally obtained in granule form, contains 40%-70% starch, 8%-40% plasticiser, 5%-30% cellulose, 0.5%-5% proteins; the cross-linking enzyme is transglutaminase.