Controlled drug release Controlled drug delivery 4 Delayed-Action Preparations 4 Drug products 4 Scanning electron microscopy 4 seaweed 4 Antibiotics 2 Argentina 2 Carrageenan 2 Carrageenans 2 Cationized agarose 2 Crystalline materials 2 Diffusion 2 Drug Compounding 2 Electrolytes 2 Eudragit E 2 Excipients 2 Gas adsorption 2 Gigartina skottsbergii 2 IPECs 2 Ibuprofen 2 Interpolyelectrolyte complexes (IPECs) 2 Methylmethacrylates 2 Molecular Structure 2 Molecular Weight 2 Morphological characterization 2 Narrow size distributions 2 Nitrogen adsorption isotherm 2 Patagonia 2 Physico-chemical characterization 2