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Citation: WANG Xue, YANG Kun-Cheng, MAO Zhi-Yuan, HUANG Cheng-Zhi, WANG Jian. Determination of L-Cysteine Based on Energy Transfer between Cu_2-xSe Nanoparticles and Rhodamine B[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(10): 1482-1486. doi: 10.11895/j.issn.0253-3820.160409 shu

Determination of L-Cysteine Based on Energy Transfer between Cu_2-xSe Nanoparticles and Rhodamine B

Key Laboratory on Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China

Received Date: 27 May 2016
Revised Date: 14 August 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21405123).

Figures(6)

The fluorescence of Rhodamine B could be quenched by the manner of photo-induced electron transfer with Cu_2-xSe nanoparticles as the energy receptor and Rhodamine B as the energy donor. However, L-cysteine was capable of recovering the fluorescence of Rhodamine B, and the fluorescence intensity was proportional to the concentrations of L-cysteine. Based on that, a novel method for detecting L-cysteine was established. After mixing L-cysteine and Rhodamine B pretreated by Cu_2-xSe nanoparticles at pH 4.6 and 30℃ for 2 min, a linear relationship was obtained between the fluorescence intensity of Rhodamine B at 575 nm and the concentrations of L-cysteine in the range of 2.5×10^-7-1.1×10^-6 mol/L. This method was used in the determination of L-cysteine with a detection limit (3σ/k) of 5.5×10^-8 mol/L. The common amino acids presented little interference for the L-cysteine detection.
- Cu_2-xSe nanoparticles,
- L-Cysteine,
- Photo-induced electron transfer
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