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Citation: JIANG Rui, YANG Xue-Mei, WANG Ming-Li, YANG Min-Li. Ultrasensitive Determination of L-Cysteine Based on Its Enhancement to Electrochemiluminescence of CdS Quantum Dots with Cd²⁺ Rich Surface[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(3): 409-415. doi: 10.11895/j.issn.0253-3820.160724 shu

Ultrasensitive Determination of L-Cysteine Based on Its Enhancement to Electrochemiluminescence of CdS Quantum Dots with Cd²⁺ Rich Surface

College of Life and Environmental Science, Shanghai Normal University, Shanghai 200234, China

Received Date: 27 September 2016
Revised Date: 11 January 2017

A novel electrochemiluminescence (ECL) method for the determination of L-cysteine (L-Cys) was established. Water-soluble CdS quantum dots (QDs) with Cd²⁺ rich surface were synthesized via a controllable one-poe approach. The mercapto group in L-cysteine molecule can specifically interact with excessive Cd²⁺ on the surface of CdS QDs, resulting in enhancement of ECL intensity of the CdS QDs, which can be used for the detection of L-Cys. Under the optimal experimental conditions, the enhancement of ECL intensity was linear with the concentration of L-Cys in the range of 5.0×10^-9-1.0×10^-5 mol/L. The limit detection of (S/N=3) was 1.2×10^-9 mol/L. In comparison with other methods for detecting L-Cys, this method is more simple and selective, and can be applied to detect L-Cys in real sample with satisfactory results.
- Electrochemiluminescence,
- CdS quantum dots with Cd²⁺rich surface,
- L-Cysteine
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Ultrasensitive Determination of L-Cysteine Based on Its Enhancement to Electrochemiluminescence of CdS Quantum Dots with Cd2+ Rich Surface

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通讯作者: 陈斌, bchen63@163.com

Ultrasensitive Determination of L-Cysteine Based on Its Enhancement to Electrochemiluminescence of CdS Quantum Dots with Cd²⁺ Rich Surface