Department of Chemistry, Seoul National University, Seoul 151-747, Korea.
ACS Appl Mater Interfaces. 2010 Jan;2(1):292-5. doi: 10.1021/am9006963.
A strategy for the rational design of a novel colorimetric sensor based on dithioerythritol-modified gold nanoparticles for the selective recognition of Hg2+ in aqueous media is presented. This approach relies on the combination of gold nanoparticles with Hg2+ through sulfur-Hg2+-sulfur interaction. The gold nanoparticles showed high selectivity toward Hg2+ with binding-induced red shift in the absorption spectra, with no response to major interfering cations such as Pb2+, Cd2+, and Cu2+ in the presence of ethylenediamine tetraacetic acid. The system responds to Hg2+ with a detection limit of 100 nM and might open a new avenue for the development of Hg2+ sensing probes.
提出了一种基于巯基乙二醇修饰的金纳米粒子的新型比色传感器的合理设计策略，用于在水相介质中选择性识别 Hg2+。该方法依赖于金纳米粒子与 Hg2+通过硫-Hg2+-硫相互作用的结合。金纳米粒子对 Hg2+表现出高选择性，伴随着吸收光谱的结合诱导红移，在存在乙二胺四乙酸的情况下，对主要干扰阳离子如 Pb2+、Cd2+和 Cu2+没有响应。该体系对 Hg2+的检测限为 100 nM，可能为 Hg2+传感探针的开发开辟新途径。
