Smartphone-assisted visual ratio-fluorescence detection of hypochlorite based on copper nanoclusters

Yanyue Li; Yu He; Yili Ge; Gongwu Song; Jiangang Zhou

doi:10.1016/j.saa.2021.119740

Smartphone-assisted visual ratio-fluorescence detection of hypochlorite based on copper nanoclusters

Spectrochim Acta A Mol Biomol Spectrosc. 2021 Jul 5:255:119740. doi: 10.1016/j.saa.2021.119740. Epub 2021 Mar 23.

Authors

Yanyue Li¹, Yu He², Yili Ge¹, Gongwu Song¹, Jiangang Zhou¹

Affiliations

¹ Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, China.
² Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, China. Electronic address: heyu@hubu.edu.cn.

PMID: 33799190
DOI: 10.1016/j.saa.2021.119740

Abstract

A sensitive naked eye and ratio-fluorescence sensor for Curcumin (CCM) and hypochlorite (ClO^-) determination based on copper nanoclusters (Cu NCs) was developed. The fluorescence of the Cu NCs can be quenched due to inner filter effect (IFE) between CCM and Cu NCs, and the ratio fluorescence probe was formed. After adding ClO^- to Cu NCs-CCM system, the phenolic and methoxy groups of CCM were oxidized to quinones, then the fluorescence of CCM was quenched and the fluorescence of Cu NC was restored. Moreover, the continuous detection of CCM and ClO^- is accompanied by the change of solution color. Therefore, CCM and ClO^- semiquantitative visual and fluorescence dual channel detection were realized. The detection results show that the detection based on Cu NCs-CCM probe has a wide detection range (0-412 µM) and low detection limit (24 µM), and a good recovery rate is obtained in adulterated milk and tap water detection. Furthermore, smartphone was introduced for image digital colorimetric analysis through the acquisition, recognition and RGB data processing of solution colors, providing an effective scheme for the field rapid detection of hypochlorite.

Keywords: Copper nanoclusters; Curcumin; Hypochlorite; Naked eye detection; Ratio-fluorescence; Smartphone.