Issue 20, 2013

Retracted Article: Facile synthesis of quantum dots/mesoporous silica/quantum dots core/shell/shell hybrid microspheres for ratiometric fluorescence detection of 5-fluorouracil in human serum

Abstract

Compared to single photoluminescence (PL) intensity-based sensors, dual-emitting-based ratiometric PL sensors are more preferable because the influence from PL fluctuation in the reagents and background PL can be reduced to a minimum. However, so far no report has been directed to the ratiometric PL detection of 5-fluorouracil (5-FU). In this study, for the first time, high-quality quantum dots (QD1)/mesoporous silica (SiO2)/quantum dots (QD2) core/shell/shell hybrid microspheres (QD1/SiO2/QD2) were prepared by self-assembly, and further developed toward a ratiometric PL sensor of 5-FU. The addition of 5-FU induced regular PL quenching of QD2, but hardly influenced on the PL of QD1 in the microspheres. Based on the linear relationship (R = −0.9994) between the ratiometric PL intensity (IQD2/IQD1) and the molar concentration of 5-FU (0–1 μM), a ratiometric PL sensor for 5-FU was achieved and displays a low limit of detection (20 nM). Experimental results testified that this sensor for the detection of 5-FU in human serum samples was highly sensitive and selective over other inorganic ions and biological molecules. Compared with conventional analysis techniques and other spectrofluorimetric methods reported previously, this proposed ratiometric PL sensor could be a good candidate for the highly efficient detection of 5-FU.

Graphical abstract: Retracted Article: Facile synthesis of quantum dots/mesoporous silica/quantum dots core/shell/shell hybrid microspheres for ratiometric fluorescence detection of 5-fluorouracil in human serum

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
31 May 2013
Accepted
18 Jul 2013
First published
22 Jul 2013

Analyst, 2013,138, 5956-5964

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