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Journal Article
Research Support, Non-U.S. Gov't
30 s Response Time of K + Ion-Selective Hydrogels Functionalized with 18-Crown-6 Ether Based on QCM Sensor.
Advanced Healthcare Materials 2018 March
Potassium detection is critical in monitoring imbalances in electrolytes and physiological status. The development of rapid and robust potassium sensors is desirable in clinical chemistry and point-of-care applications. In this study, composite supramolecular hydrogels are investigated: polyethylene glycol methacrylate and acrylamide copolymer (P(PEGMA-co-AM)) are functionalized with 18-crown-6 ether by employing surface initiated polymerization. Real-time potassium ion monitoring is realized by combining these compounds with quartz crystal microbalance. The device demonstrates a rapid response time of ≈30 s and a concentration detection range from 0.5 to 7.0 × 10-3 m. These hydrogels also exhibit high reusability and K+ ion selectivity relative to other cations in biofluids such as Na+ , NH4 + , Mg2+ , and Ca2+ . These results provide a new approach for sensing alkali metal ions using P(PEGMA-co-AM) hydrogels.
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