Keywords Parole chiave: Mercury Ions, Fluorescence, Dansyl-Aminoacid, Optical Fiber Probe,
Affiliations Affiliazioni: *** IBB - CNR ***
Optoelectronics Group, Department of Engineering, University of Sannio, I-82100 Benevento, Italy Institute of Biostructure and Bioimaging, National Research Council, I-80143 Naples, Italy Interuniversity Research Centre on Bioactive Peptides (CIRPeB), University “Federico II”, Naples, Italy
References Riferimenti: Not available. Non disponibili.
Fluorescent chemosensors for Hg2+ detection in aqueous environment
Mercury is a pollutant extremely toxic to the environment and human health. Although numerous methods have been reported for the analysis of Hg2+ ions in water, the development of simple, rapid, inexpensive, and sensitive sensors still represents a challenge. Here, we describe the design, synthesis and spectral characterization of a set of dansyl-amino acids able to recognize Hg2+ ions via different fluorescence emission modes. The analysis of the binding features of the different chemosensors shows that the stoichiometry of the sensor–Hg2+ complex depends on the concentration of the sensor and Hg2+ since it plays an important role in the type of response for Hg2+ ions. Among those studied here N-dansylated methionine is the best performing chemosensor in terms of sensitivity with a LOD of 140 nM. To improve the LOD of this chemosensor, we evaluated the response of a portable experimental set-up based on optical fiber probes. The new device shows an increase of LOD from 140 nM to about 5 nM, which can meet the requirements imposed by the Environmental Protection Agency for monitoring Hg2+ in drinkable water. We also show that the chemosensors are not applicable to marine water-based matrices because of the significant coordinating ability of chloride anions with Hg2+.
Graphical abstract
Fluorescent chemosensors for Hg2+ detection in aqueous environment
160 Records (153 escludendo Abstract e Conferenze). Impact factor totale: 606.441 (588.727 escludendo Abstract e Conferenze). Impact factor a 5 anni totale: 630.981 (611.914 escludendo Abstract e Conferenze).
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