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Citation: WU Liang-Liang, QIAN Zhi-Juan, XIE Zheng-Jun, ZHANG Ying-Ying, PENG Chi-Fang. Colorimetric Detection of Copper Ions Based on Surface Modification of Silver/Platinum Cluster Nanoenzyme[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(4): 471-476. doi: 10.11895/j.issn.0253-3820.160710 shu

Colorimetric Detection of Copper Ions Based on Surface Modification of Silver/Platinum Cluster Nanoenzyme

1.
State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi 214122, China;
2.
Yangzhou Entry-Exit Inspection and Quarantine Bureau, Yangzhou 225000, China

Received Date: 21 September 2016
Revised Date: 21 November 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No.31371767) and the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period (No.2015BAD17B02).

A sensitive colorimetric method for the detection of copper ions (Cu²⁺) was developed based on the surface modification of silver/platinum nanoclusters (Ag/Pt NCs) and regulation of peroxidase-like activity. It was found that 3-mercaptopropionic acid (MPA) could inhibit the catalytic ability of Ag/Pt NCs; however, it lost the inhibition toward catalytic ability of Ag/Pt NCs after oxidized by oxygen through the catalysis of Cu²⁺. On the basis of this, a colorimetric method was developed for the detection of Cu²⁺ through measuring the colorimetric signal variation of the TMB-H₂O₂ reaction. This method exhibited high sensitivity and selectivity toward Cu²⁺ over a panel of other metal ions. The linear range was 10-100 nmol/L and the detection limit was 5.0 nmol/L (3σ). The above method was also applied to detect real water samples and spiked samples, and the results demonstrated that this method was simple with low cost.
- Silver/platinum nanoclusters,
- Colorimetric detection,
- 3-Mercaptopropionic acid,
- Copper ions
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