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A. Richter, A. Bund, M. Keller and K. Arndt, “Characterization of a Microgravimetric Sensor Based on pH Sensitive Hydrogels,” Sensors and Actuators B: Chemical, Vol. 99, No. 2-3, 2004, pp. 579-585. doi:10.1016/j.snb.2004.01.011

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.