Smartphone-enabled colorimetric determination of silver ions exploiting the peroxidase-mimetic behavior of bowl-shaped Pd₃Pt nanocrystals

作者全名："Wu, Shiyue; Han, Chaoqin; Fu, Wensheng; Gong, Xue; Jiang, Zhongwei; Wang, Yi; Zhang, Pu"

作者地址："[Wu, Shiyue; Han, Chaoqin; Fu, Wensheng; Gong, Xue; Jiang, Zhongwei; Wang, Yi] Chongqing Normal Univ, Coll Chem, Minist Educ, Engn Res Ctr Biotechnol Act Subst,Chongqing Key La, Chongqing 401331, Peoples R China; [Wu, Shiyue; Zhang, Pu] Chongqing Med Univ, Coll Pharm, Chongqing Res Ctr Pharmaceut Engn, Chongqing 400016, Peoples R China"

通信作者："Wang, Y (通讯作者)，Chongqing Normal Univ, Coll Chem, Minist Educ, Engn Res Ctr Biotechnol Act Subst,Chongqing Key La, Chongqing 401331, Peoples R China.; Zhang, P (通讯作者)，Chongqing Med Univ, Coll Pharm, Chongqing Res Ctr Pharmaceut Engn, Chongqing 400016, Peoples R China."

来源：MICROCHEMICAL JOURNAL

ESI学科分类：CHEMISTRY

WOS号：WOS:001088605700001

JCR分区：Q1

影响因子：4.9

年份：2023

卷号：195

期号：　

开始页：　

结束页：　

文献类型：Article

关键词：Nanozyme; Peroxidase; Metal nanocrystal; Colorimetric detection; Smartphone

摘要："Excessive silver ions (Ag+) pose significant risks to both human health and the environment, necessitating the rapid and sensitive detection of Ag+ in aqueous systems to ensure public health and environmental safety. In this study, we present a novel and expeditious colorimetric methodology for Ag+ detection, employing bowl-shaped Pd3Pt nanocrystals as an effective probe. The distinctive bowl-like structure of Pd3Pt provides an abundance of catalytic active sites, endowing them with peroxidase-like activity. Upon exposure to hydrogen peroxide, these Pd3Pt nanobowls facilitate the oxidation of the colorless substrate 3,3 ',5,5 '-tetramethylbenzidine (TMB), resulting in the formation of the blue product oxTMB, which exhibits a pronounced characteristic absorption peak at 652 nm. By virtue of the metal affinity and electrostatic attraction between Ag+ ions and Pd3Pt nanobowls, Ag+ species effectively adsorb onto the nanobowls surface, preferentially occupying the catalytic active sites and impeding the production of the blue oxTMB product. Based on this mechanism, we have established a novel colorimetric approach for the quantitative determination of Ag+, enabling facile Ag+ detection using either a UV-vis absorption spectrometer or a smartphone as the detection instrument. The developed method demonstrates an impressive detectable range spanning 1-100 nmol/L, accompanied by a detection limit of 0.72 nmol/L. Notably, this technique boasts several desirable attributes, including rapid detection, simplified operational procedures, heightened sensitivity, and commendable selectivity. Moreover, we have successfully applied this method to assess Ag+ levels in water samples procured from diverse sources, further attesting to its practical utility and versatility."

基金机构：National Natural Science Foundation of China [81972020]; Chongqing Innovation Research Group Project [CXQT21015]; Chongqing Youth Expert Studio

基金资助正文：This work was supported by the National Natural Science Foundation of China (81972020) and Chongqing Innovation Research Group Project (CXQT21015) . Y.W. was also sponsored by the Chongqing Youth Expert Studio.