Issue 11, 2013

Simple and sensitive turn-on luminescent detection of biothiols based on energy transfer between green-emitting upconversion nanocrystals and gold nanoparticles

Abstract

We have constructed a nanoconjugate composed of positively charged NaYF4:Yb3+,Er3+ upconversion nanoparticles (UCNPs) and negatively charged gold nanoparticles (AuNPs). Fluorescence resonance energy transfer occurs between the UCNPs and the AuNPs. If the AuNPs interact with thiols, this will cause aggregation and lead to the decreased absorption by the AuNPs. As a result, the luminescence intensity of the UCNPs will be restored. This finding was explored to design a simple and sensitive luminescence assay for biothiols including cysteine, homocysteine. Under the optimal conditions, the calibration plot is linear in the range from 0.04 to 1.00 μg mL−1 of cysteine, and from 0.06 to 1.80 μg mL−1 of homocysteine. This method was applied to the determination of cysteine in synthetic samples.

Graphical abstract: Simple and sensitive turn-on luminescent detection of biothiols based on energy transfer between green-emitting upconversion nanocrystals and gold nanoparticles

Article information

Article type
Paper
Submitted
18 Jan 2013
Accepted
07 Apr 2013
First published
09 Apr 2013

Anal. Methods, 2013,5, 2873-2879

Simple and sensitive turn-on luminescent detection of biothiols based on energy transfer between green-emitting upconversion nanocrystals and gold nanoparticles

H. Chen, F. Yuan and L. Wang, Anal. Methods, 2013, 5, 2873 DOI: 10.1039/C3AY40105G

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