Journal
LANGMUIR
Volume 30, Issue 50, Pages 15364-15372Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la5039798
Keywords
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Funding
- National Natural Science Foundation of China [21173142]
- Ministry of Education of China [NCET-12-0895]
- Shaanxi Provincial Department of Science and Technology [2011KJXX48]
- Program of Introducing Talents of Discipline to Universities [B14041]
- Fundamental Research Funds for the Central Universities [GK201301006]
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A new cationic dansyl derivative-based (DIlSD) fluorescence probe was designed and synthesized. Its combination with anionic surfactant SDS assemblies shows enhanced fluorescence intensity and blue-shifted maximum wavelength. Its fluorescence can be slightly quenched by Cu2+; however, the fluorescence quenching efficiency by Cu2+ is highly increased upon titration of arginine (Arg). As a result, the ternary system containing the cationic fluorophore, anionic surfactant, and Cu2+ functions as a highly sensitive and selective sensor to Arg. The optimized sensor system displays a detection limit of 170 nM, representing the highest sensitivity to Arg in total aqueous solution by a fluorescent sensor. Control experiments reveal that the imidazolium groups in the fluorophore, the anionic surfactant, and Cu2+ all play important roles in the process of sensing Arg. The electrostatic interaction between the cationic fluorophore and anionic surfactants facilitates the binding of imidazolium rings with Cu2+, the surfactant surface-anchored Cu2+ is responsible for further binding of Arg, and the electrostatic interaction between anionic surfactants and positively charged amino acids accounts for the selective responses to Arg.
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