Tian Yueyue, Chen Yancao, Chen Mei, Song Zhi-Ling, Xiong Bin, Zhang Xiao-Bing
College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.
College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
Talanta. 2021 Jan 1;221:121627. doi: 10.1016/j.talanta.2020.121627. Epub 2020 Sep 12.
Here we report the peroxidase-like Au@Pt nanozyme as an integrated nanosensor for selective detection of silver ions (Ag), where the nanozyme plays the roles as both the signal trigger and reporter simultaneously. This method relies on two critical chemical reactions, including (1) the unique inhibitory effect of Ag on the nanozyme triggered HO decomposition at weak acid environment and (2) HO induced Ag reduction onto the nanozyme surface at basic environment, leading to a blueshift in the localized surface plasmonic resonance wavelength (LSPR λ) of the nanosensor. With this simple strategy, we demonstrated the sensitive and selective detection of Ag over a dynamic range from 0.5 to 1000 μM with a limit of detection (LOD) of 500 nM by UV-visible spectroscopy, which is below the permitted level of Ag in drinking water by U.S. Environmental Protection Agency (EPA). This method also exhibits satisfying recovery efficiency for Ag detection both in tap water and spring water from the Yuelu Mountain. With this satisfying sensing performance and excellent stability of nanoprobes, this strategy is promising for the detection of Ag in environment monitoring and food safety analysis.
在此，我们报道了一种过氧化物酶样的金@铂纳米酶作为一种用于选择性检测银离子（Ag）的集成纳米传感器，其中该纳米酶同时充当信号触发剂和报告分子。该方法依赖于两个关键化学反应，包括：（1）在弱酸环境下，Ag对纳米酶触发的过氧化氢（HO）分解具有独特的抑制作用；（2）在碱性环境下，HO诱导Ag在纳米酶表面还原，导致纳米传感器的局域表面等离子体共振波长（LSPR λ）发生蓝移。通过这种简单的策略，我们利用紫外可见光谱法在0.5至1000 μM的动态范围内实现了对Ag的灵敏且选择性检测，检测限（LOD）为500 nM，该检测限低于美国环境保护局（EPA）规定的饮用水中Ag的允许含量水平。该方法对来自岳麓山的自来水和泉水中的Ag检测也表现出令人满意的回收率。凭借这种令人满意的传感性能和纳米探针出色的稳定性，该策略在环境监测和食品安全分析中检测Ag方面具有广阔前景。
