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Picomolar selective detection of mercuric ion (Hg2+) using a functionalized single plasmonic gold nanoparticle

机译：使用功能化的单等离激元金纳米粒子对汞离子（Hg2 +）进行皮摩尔选择性检测

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摘要

A highly sensitive method for the selective detection and quantification of mercuric ions (Hg2+) using single plasmonic gold nanoparticle (GNP)-based dark-field microspectroscopy (DFMS) is demonstrated. The method is based on the scattering property of a single GNP that is functionalized with thiolated molecules, which is altered when analytes bind to the functionalized GNP. The spectral resolution of the system is 0.26 nm and a linear response to Hg2+ was found in the dynamic range of 100 pM–10 μM. The method permits Hg2+ to be detected at the picomolar level, which is a remarkable reduction in the detection limit, considering the currently proscribed Environmental Protection Agency regulation level (10 nM, or 2 ppb) and the detection limits of other optical methods for detecting Hg2+ (recently approx. 1–10 nM). In addition, Hg2+ can be sensitively detected in the presence of Cd2+, Pb2+, Cu2+, Zn2+ and Ni2+, which do not interfere with the analysis. Based on the findings reported herein, it is likely that single-nanoparticle-based metal ion sensing can be extended to the development of other chemo- and biosensors for the direct detection of specific targets in an intracellular environment as well as in environmental monitoring.
机译：演示了一种基于单等离激元金纳米粒子（GNP）的暗场显微光谱（DFMS）选择性检测和定量汞离子（Hg2 +）的高灵敏度方法。该方法基于被硫醇化分子官能化的单个GNP的散射特性，当分析物与官能化GNP结合时，该特性会发生改变。该系统的光谱分辨率为0.26 nm，在100 pM–10μM的动态范围内发现了对Hg2 +的线性响应。该方法允许在皮摩尔水平上检测Hg2 +，考虑到当前规定的环境保护局法规水平（10 nM或2 ppb）和其他用于检测Hg2 +的光学方法的检测限，这大大降低了检测限。 （最近大约1–10 nM）。此外，可以在不干扰分析的Cd2 +，Pb2 +，Cu2 +，Zn2 +和Ni2 +的存在下灵敏地检测Hg2 +。基于本文报道的发现，基于单纳米颗粒的金属离子感测可能会扩展到其他化学和生物传感器的开发中，以直接检测细胞内环境以及环境监测中的特定目标。

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