the invention concerns a product comprising hyaluronic acid or a salt thereof , wherein the hyaluronic acid has been partially or fully linked or crosslinked with a polymer of an alpha hydroxy acid . the invention also concerns manufacture of the product , uses of the product of the invention in the field of biodegradable plastic materials for the preparation of sanitary and surgical articles , in the pharmaceutical and cosmetic fields ; including the various articles made with the same in such fields .