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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 1
BKCSDE 29(1)
January 20, 2008 

The Composition Dependence Selectivity Changes by Plasticizer at the Cation Sensors Based on Tetracycline Antibiotics
Jonggyu Baek, Jin-San Kim, Insook Rhee Paeng, Ki-Jung Paeng*
Cation selective electrodes, Tetracycline, Plasticizer, Membrane
The performances of tetracycline based cation selective polymeric membrane electrodes of many sets with different plasticizers were investigated as the selectivity of ion-selective electrodes and optodes are greatly influenced by membrane solvent and also controlled by plasticizers. The membrane 1 with Bis(2-ethylhexyl) sebacate (DOS) and additive shows good potentiometric performance toward Ca2+ (slope: 27.8 mV per decade; DL: ?4.52) including selectivity. Contrastingly, membrane 4 with Dibutyl phthalate (DBP) shows near- Nernstian response, it has also shown the best measuring range and detection limit for Ca2+ (29.5 mV and ?5.10) and Mg2+ (24.4 mV and ?5.04) and the least selectivity has been also observed between Ca2+ and Mg2+. When the membrane 1 and 4 were used together to flow system, we could determine the concentration of Ca2+ and Mg2+, simultaneously.
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