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Reference type: Journal
Authors: Hrdina A, Lai E, Li CS, Sadi B, Kramer GH
Article Title: Synthesis of crown ether modified cation exchange polymer particles for 90Sr urinalysis.
Publication date: 2012
Journal: Reactive and Functional Polymers
Volume: 72
Issue: (5)
Page numbers: 295-302.
DOI: 10.1016/j.reactfunctpolym.2012.03.003
Alternative URL: http://www.sciencedirect.com/science/article/pii/S1381514812000582

Abstract: Cation exchange polymer particles have been synthesized for urinalysis to monitor levels of strontium-90 (90Sr) exposure in humans. Two techniques were utilized in the incorporation of a Sr2+ selective chelating agent, di-tert-butyl-cyclohexano-18-crown-6 (DtBuCH18C6). The ion imprinting technique involved entrapment of DtBuCH18C6 during the formation of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) polymer particles. In the surface immobilization technique, adsorption of DtBuCH18C6 onto the surface of AMPS polymer particles was assisted by a molecular modifier. Ethylene glycol dimethacrylate (EGDMA) and divinylbenzene (DVB) were evaluated as cross-linking agents to provide better support for DtBuCH18C6. These polymer particles were characterized by scanning electron microscopy, dynamic light scattering, and Fourier transform infrared spectroscopy. Radiometric binding assays demonstrated that surface immobilization, in comparison to matrix imprinting, achieved greater Sr2+ uptake. Application of the surface immobilized particles in urinalysis was successful, attaining 86 2% 90Sr uptake at pH 9
Template and target information: strontium ion, Sr(II), 90Sr
Author keywords: crown ether, ion imprinting, Surface immobilization, Strontium-90


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