Impact of magnetic nanofillers in the swelling and release properties of κ-carrageenan hydrogel nanocomposites

► κ-carrageenan/Fe3O4 hydrogel nanocomposites for drug delivery applications. ► Fe3O4 nanofillers affect carrageenan swelling and mechanism of drug release. ► Release profile tailored by incorporating variable Fe3O4 nanoparticles loads.