期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 321, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128490
关键词
Hydrogel; Microsphere; Fluorescent probe; Dual detection; Al3+; Hg2+
资金
- National Natural Science Foundation of China [21901117, 21722605, 21978131, 21878156]
- National Key R&D Program of China [2018YFA0902200]
- Jiangsu Specially-Appointed Professor program
- Natural Science Foundation of Jiangsu Province [20190674]
- State Key Laboratory of MaterialsOriented Chemical Engineering [ZK201809]
- Six Talent Peaks Project in Jiangsu Province [XCL-034]
- Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Traditional fluorescent sensors for simultaneous detection of metal ions require the use of specially designed fluorescent probes. In this manuscript, we have employed a new strategy for the design of a sensor for simultaneous detection of metal ions that is based on a fluorescent probe encapsulated hydrogel matrix. An investigation designed to assess this strategy led to the development of a novel dual fluorescent encapsulated hydrogel microsphere sensor for sensitive and simultaneous detection of Al3+ and Hg2+. The hyperbranched poly (poly (ethylene glycol) diacrylate) (HB-PEGDA) and thiolated sodium alginate (SA-SH) composite hydrogel microspheres used to construct the sensor, which contain two fluorescent probes encapsulated in a highly dense manner, were prepared by using a self-assembly method in conjunction with a microfluidic device. The functionalized hydrogel microspheres were shown to exhibit high selectivity for Al3+ and Hg2+ among various metal ions with a detection limit of 70 nM and 120 nM, respectively. In addition, the hydrogel microspheres can be readily separated from test samples and utilized for repeated use by removing Al3+ and Hg2+ by addition of a solution containing EDTA and KI. Compared with previously devised sensors, the new HB-PEGDA/SA-SH composite hydrogel microspheres containing two encapsulated fluorescent probes are readily prepared and effective for simultaneous detection of two different metal ions.
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