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  • Title: A simple but highly sensitive and selective colorimetric and fluorescent probe for Cu2+ in aqueous media.
    Author: Li Y, Zhang X, Zhu B, Xue J, Zhu Z, Tan W.
    Journal: Analyst; 2011 Mar 21; 136(6):1124-8. PubMed ID: 21210047.
    Abstract:
    In this paper, CN-DPA was prepared as an effective colorimetric and fluorescent probe for copper ions (Cu(2+)) in aqueous solution. It exhibits good sensitivity and selectivity for Cu(2+) over other metal ions both in aqueous solution and on a simple colorimetric paper-made test kit. Upon addition of Cu(2+), a remarkable color change from purple to colorless was easily observed by the naked eye, and a fluorescence quenching was also determined. Furthermore, CN-DPA can be used to quantitatively detect Cu(2+). The linear range was 0-5 μM determined by absorption spectrometry. All these selective and sensitive results indicate that CN-DPA could meet the selective requirements for biomedical and environmental application and be sensitive enough to detect Cu(2+) in environmental water samples, even in drinking water, which has a limit of 20 μM defined by the U.S. Environmental Protection Agency.
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