Abstract: A method for the preparation of a gelled polysaccharide foam, which includes the following steps: (a) the preparation of a mixture including at least one solubilized polysaccharide chosen from alginates, pectic substances, carrageenans, and mixtures thereof, at least one solvent of the polysaccharide, at least one ionic crosslinking agent of the polysaccharide, the crosslinking agent being not available, optionally a plasticizer soluble into the solvent, optionally a surfactant, and optionally an additive, (b) foaming and gelling the mixture prepared at step (a) by incorporating a pH modifying gas, and (c) optionally drying the gelled foam obtained at step (b). Also, the gelled foam obtained from such a method as well as the uses thereof.