Abstract
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.
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All authors received financial support from the Natural Science Foundation of China (Grant No. 21801215).
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A colorimetric sensor array for the discrimination of multiple antioxidants based on three chloroauric acid/Au-Ag nanocube sensors
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Li, L., Li, S., Yu, X. et al. Visual detection of multiple antioxidants based on three chloroauric acid/Au-Ag nanocubes. Microchim Acta 188, 122 (2021). https://doi.org/10.1007/s00604-021-04774-5
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DOI: https://doi.org/10.1007/s00604-021-04774-5