Biodegradable coatings and articles that include natural biodegradable polysaccharides are described. The coatings and articles are formed from a plurality of natural biodegradable polysaccharides having pendent coupling groups.Revêtements et articles biodégradables à polysaccharides naturels biodégradables, constitués de plusieurs polysaccharides naturels biodégradables ayant des groupes de couplage pendants.