Grafting of κ-carrageenan with methyl methacrylate was carried out by Prasad, Meena, and Siddhanta (2006) employing microwave irradiation. The resultant crystalline product could be obtained rapidly (2 min). The copolymerization of κ-carrageenan with acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid led to the development of biodegradable hydrogels with potential use for novel drug delivery systems (Pourjavadi, Barzegar, & Zeidabadi, 2007).