Citation: ZHAO Dan, LI Na, XU Yan-Jie, HUANG Jing-Jing, CHEN Chuan-Xia. Colorimetric Sensing of Cyanide Based on Inhibition of Peroxidase-like Activity of Cysteamine-modified Gold Nanoparticles[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(7): 889-895. doi: 10.19756/j.issn.0253-3820.201051 shu

Colorimetric Sensing of Cyanide Based on Inhibition of Peroxidase-like Activity of Cysteamine-modified Gold Nanoparticles

1.
Department of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, China;
2.
School of Materials Science and Engineering, University of Jinan, Jinan 250022, China

Received Date: 19 January 2020
Revised Date: 27 April 2020

Fund Project: This work was supported by the Project of Science and Technology Department (No. 192102310405), the National Natural Science Foundation of China (No. 21904048), the Scientific Research Foundation of Luoyang Institute of Science and Technology (No. 2017BZ16), the Project of Science and Technology Department (No. 192102310405) and the Key Project of the Education Department of Henan Province, China (Nos. 19A150002, 20B150015, 20B150016).

A simple, sensitive and label-free colorimetric sensor for cyanide (CN^-) was developed based on analyte-induced shielding of peroxidase-like activity of cysteamine-capped gold nanoparticles (cyst-AuNPs). The cyst-AuNPs could catalyze the H₂O₂-mediated oxidation of 3,3',5,5'-tetramethylbenzidine (TMB), producing blue oxidized TMB (oxTMB) with a maximum absorption at 652 nm. With the addition of cyanide, AuNPs could be efficiently oxidized by the dissolved oxygen under alkaline conditions to form soluble and colorless complex, Au(CN)₂^-, which reduced the catalytic ability of AuNPs, thus producing less oxTMB. On the basis of this, both color and absorption at 652 nm decreased corresponding to the concentration of CN^-. Due to the signal amplification effect of the catalytic reaction, a detection limit as low as 0.33 μmol/L was obtained, which was much lower than the maximum level (1.9 μmol/L) of CN^- in drinking water permitted by the World Health Organization. Furthermore, the as-proposed sensor required neither surface modification of nanoparticles nor complex operations. These advantages make this sensor a powerful protocol for the quantitative detection of cyanide in water samples with satisfactory results.
- Cyanide ion,
- Colorimetric method,
- Cysteamine-capped gold nanoparticles,
- Peroxidase-like activity
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