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L. H. Gan, G. R. Deen, Y. Y. Gan and K. C. Tam, “Water Sorption Studies of New pH-Responsive N-acryloyl-N′- methyl piperazine and Methyl Methacrylate Hydrogels,” European Polymer Journal, Vol. 37, No. 7, 2001, pp. 1473-1478. doi:10.1016/S0014-3057(00)00250-0

has been cited by the following article:

• TITLE: Synthesis of pH-Sensitive Hydrogel Based on Starch-Polyacrylate Superabsorbent

  AUTHORS: Mohammad Sadeghi, Fatemeh Soleimani

  KEYWORDS: Starch; Hydrogel; pH-Sensitive; Vinylic Monomers

  JOURNAL NAME: Journal of Biomaterials and Nanobiotechnology, Vol.3 No.2A, May 11, 2012

  ABSTRACT: In this article, we synthesize of a novel starch-based superabsorbent hydrogel via graft copolymerization of mixtures of acrylic acid (AA) and 2-Hydroxy ethyl methacrylate (HEMA) onto starch backbones. The polymerization reaction was carried out in an aqueous medium and in the presence of ammonium persulfate (APS) as an initiator and N,N’-methylene bisacrylamide (MBA) as a crosslinker. The hydrogel structures were confirmed by FTIR spectroscopy. Furthermore, the swelling of superabsorbing hydrogels was examined in solutions with pH values ranging between 1 and 13. It showed a reversible pH-responsive behavior at pHs 2 and 8. This on-off switching behavior makes the synthesized hydrogels as an excellent candidate for controlled delivery of bioactive agents. A proposed mechanism for hydrogel formation was suggested and the structure of the product was established using FTIR and SEM spectroscopies.