文献类型：期刊文献

英文题名：Histidine-mediated tunable peroxidase-like activity of nanosized Pd for photometric sensing of Ag+

作者：Zhang, Wenchi[1];Niu, Xiangheng[1];Meng, Suci[1];Li, Xin[1];He, Yanfang[1];Pan, Jianming[1];Qiu, Fengxian[1];Zhao, Hongli[2];Lan, Minbo[2]

机构：[1]Jiangsu Univ, Sch Chem & Chem Engn, Inst Green Chem & Chem Technol, Zhenjiang 212013, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China

年份：2018

卷号：273

起止页码：400

外文期刊名：SENSORS AND ACTUATORS B-CHEMICAL

收录：;EI(收录号：20182605360326);WOS:【SCI-EXPANDED(收录号:WOS:000441519000051)】；

基金：This research was supported by the National Natural Science Foundation of China (Nos. 21605061 and 31601549), the Natural Science Foundation of Jiangsu Province (No. BK20160489), the Natural Science Fund for Colleges and Universities in Jiangsu Province (No. 16KJB150009), the Postdoctoral Fund of China (No. 2016M600365), the Postdoctoral Fund of Jiangsu Province (No. 1601015B), the Open Fund from the Shanghai Key Laboratory of Functional Materials Chemistry (No. SKLFMC201601), the Open Fund from the State Key Laboratory of Bioreactor Engineering, and the Cultivation Project for Excellent Young Teachers in Jiangsu University.

语种：英文

外文关键词：Pd-based nanozyme; Histidine; Ag+; Activity regulation; Colorimetric detection

摘要：In this work, we proposed a new and facile strategy for the high-performance colorimetric detection of Ag+ based on the tunable peroxidase-like activity of Pd nanoparticles (NPs) mediated by histidine (His). Bare Pd NPs possess intrinsic catalytic ability to trigger the oxidation of colorless 3,3',5,5'-tetramethylbenzidine (TMB) to blue TMBox in the presence of H2O2. After being decorated by His, the formed His-Pd nanozyme exhibits significantly improved mimetic activity due to its favorable physicochemical characteristics including smaller size, interactions between Pd and His, and better hydrophilicity, and such that an enhanced TMB color reaction is observed. When Ag+ exists, it is able to despoil the His modifier from the His-Pd surface via the specific interaction between Ag+ and His, resulting in the bald Pd again with weak activity. With this principle, highly sensitive determination of Ag+ in a linear scope of 30-300 nM was achieved with a limit of detection down to 4.7 nM. In addition, the colorimetric sensor based on the tunable enzymatic activity of nanosized Pd adjusted by His could provide excellent selectivity for Ag+ sensing against common interferents. Reliability of the strategy for practical detection of Ag+ was also demonstrated.