文献类型：期刊文献

英文题名：Visual detection of multiple antioxidants based on three chloroauric acid/Au-Ag nanocubes

作者：Li, Li[1];Li, Siqun[2];Yu, Xinjie[2];Chen, Zhengbo[2]

第一作者：李丽

通讯作者：Li, L[1];Chen, ZB[2]

机构：[1]Xinxiang Univ, Sch Chem & Mat Engn, Xinxiang 453003, Henan, Peoples R China;[2]Capital Normal Univ, Dept Chem, Beijing 100048, Peoples R China

第一机构：新乡学院

通讯机构：[1]corresponding author), Xinxiang Univ, Sch Chem & Mat Engn, Xinxiang 453003, Henan, Peoples R China;[2]corresponding author), Capital Normal Univ, Dept Chem, Beijing 100048, Peoples R China.|[11071]新乡学院;

年份：2021

卷号：188

期号：4

外文期刊名：MICROCHIMICA ACTA

收录：;Scopus(收录号：2-s2.0-85102380623);WOS:【SCI-EXPANDED(收录号:WOS:000627851600003)】；

基金：All authors received financial support from the Natural Science Foundation of China (Grant No. 21801215).

语种：英文

外文关键词：Core-shell structure; Sensor array; Oxidation etching; Antioxidant discrimination; Urine samples; Linear discriminant analysis

摘要：A colorimetric sensing method is described for discrimination of multiple antioxidants based on core-shell Au@Ag nanocubes (NCs). In order to extract data-rich colorimetric responses from the sensor array, three different concentrations of chloroaurate acid (HAuCl4) were employed as sensing elements. Interestingly, Au3+ ions can be reduced to different valence states (i.e., Au(0) and Au(I)) by different antioxidants, and thus effectively inhibit the oxidation etching process of Au@Ag NCs by Au(III) ions to varying extents, generating diverse colorimetric responses (color and absorbance). This enables identification of the six antioxidants at 10 nM via linear discriminant analysis (LDA) with relative standard deviation (RSD) of 2.52% (n = 3). The discrimination ability of the sensor array was further evaluated in antioxidant binary and multicomponent mixtures. Remarkably, identification of these six antioxidants spiked in urine was realized with 100% of accuracy.