Citation: QIN Xiu, YUAN Chun-Ling, SHI Rui, WANG Shu-Zheng, WANG Yi-Lin. Colorimetric Detection of Dopamine Based on Iodine-mediated Etching of Gold Nanorods[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(1): 60-67. doi: 10.19756/j.issn.0253-3820.201384 shu

Colorimetric Detection of Dopamine Based on Iodine-mediated Etching of Gold Nanorods

School of Chemistry and Chemical Engineering, Guangxi University, Guangxi Key Laboratory of Biorefinery, Nanning 530004, China

Corresponding author: WANG Yi-Lin, theanalyst@163.com
Received Date: 2 July 2020
Revised Date: 10 October 2020

Fund Project: Supported by the National Natural Science Foundation of China (No.61664002), the Innovation Project of Guangxi Graduate Education (No.YCSW2020016) and the Foundation of College Student Innovation Ability Training of Guangxi University (No.202010593042).

A colorimetric analytical method, with wavelength change as a response, was developed for the highly sensitive determination of dopamine (DA) based on gold nanorods (AuNRs) with tunable surface plasma-resonance optical properties and the fact that AuNRs could be etched by I₂ generated from KIO₃ reduction by DA. Even though AuNRs were unable to be etched by KIO₃, however, they surrendered to I₂ generated by IO₃^- in the presence of DA, which made their absorption peak of longitudinal localized surface plasma resonance (LSPR) a blue shift, accompanied by obvious color change from wine red to blue. The influence of KIO₃ concentration, temperature, pH value and incubation time on signal responses was investigated. The results showed that under the optimized conditions including 0.7 mmol/L KIO₃, reaction temperature at 50℃, pH 2.6 and incubation time of 6 min, the amount of blue shift of AuNRs absorption wavelength was linear with DA concentration in the range of 0.80-60.0 μmol/L. The detection limit was 0.62 μmol/L (3σ/k) and the matrix in urine did not interfere with the determination. The DA recovery in actual urine samples ranged from 103.0% to 110.8%.
- Gold nanorods,
- Colorimetric,
- Dopamine
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