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A ratiometric fluorescence nanosensor for highly selective and sensitive detection of selenite.
- Source :
-
Analyst . 8/7/2016, Vol. 141 Issue 15, p4685-4693. 9p. - Publication Year :
- 2016
-
Abstract
- The instant and on-site detection of selenium still remains a challenge for environmental monitoring and medical prevention. We herein developed a ratiometric fluorescent nanosensor for accurate and on-site sensing of SeO32− by linking the recognition molecule 3,3′-diaminobenzidine (DAB) onto the surface of carboxyl group modified CdTe@SiO2. The fluorescence of DAB on the surface of silica nanospheres could be selectively and efficiently enhanced by SeO32− through a surface chelating reaction between DAB and SeO32−. Thus, in the presence of SeO32−, the nanosensor would show two characteristic fluorescence emissions of Se-DAB and CdTe QDs under a single excitation wavelength. The selectivity and the optimal conditions for the detection of SeO32− were carefully investigated. The ratio of F530/F635 linearly increased with increasing SeO32− concentration in the range of 0 to 2.5 μM and the detection limit reaches as low as 6.68 nM (0.53 ppb). This developed nanosensor has the capability of on-site detection in an aqueous system without any separation step. The Se concentrations in selenium-rich food were detected and the results were consistent with the values determined by ICP-AES. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SELENIUM
*NANOSENSORS
*CARBOXYL group
*WAVELENGTHS
*ANTIOXIDANTS
Subjects
Details
- Language :
- English
- ISSN :
- 00032654
- Volume :
- 141
- Issue :
- 15
- Database :
- Academic Search Index
- Journal :
- Analyst
- Publication Type :
- Academic Journal
- Accession number :
- 116883554
- Full Text :
- https://doi.org/10.1039/c6an00740f