Highly Sensitive and Naked Eye Dual-readout Method for L-Cysteine Detection Based on the NSET of Fluorophore Functionalized Gold Nanoparticles

Bulletin of the Korean chemical society

He Zhang¹  Yuan Liu¹  Zhitao Wu¹  Xin Fu¹ 

关键词: L-Cysteine;    Nanometal surface energy transfer;    Colorimetric;    Fluorometric;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

A simple, highly sensitive and selective method based on the rhodamine B-covered gold nanoparticle with dual-readout (colorimetric and fluorometric) detection for L-cysteine is proposed. A mechanism is that citratestabilized AuNPs were modified with RB by electrostatic interaction, which enables the nanometal surface energy transfer (NSET) from the RB to the AuNPs, quenching the fluorescence. In the presence of L-cysteine, it was used as a competitor in the NSET by the strongly Au-S bonding to release RB from the Au surface and recover the fluorescence, and the red-to-purple color change quickly, which was monitored simply by the naked eye. Under the optimum conditions, the detection limit is as low as 10 nM. The method possessed the advantages of simplicity, rapidity and sensitivity at the same time. The method was also successfully applied to the determination of L-cysteine in human urine samples, and the results were satisfying.

【 授权许可】

Unknown