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Citation: NIU Jian-Li, YU Yong-Li, CAO Yan-Jie, WANG Meng. Determination of Tryptophan Based on Inner Filter Effect of Fluorescent Yttrium Vanadate: Europium Nanoprobes[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(6): 883-888. doi: 10.11895/j.issn.0253-3820.170088 shu

Determination of Tryptophan Based on Inner Filter Effect of Fluorescent Yttrium Vanadate: Europium Nanoprobes

1.
College of Science, Northeastern University, Shenyang 110819, China;
2.
Department of Trace Examination, China Criminal Police College, Shenyang 110035, China

Received Date: 15 February 2017
Revised Date: 2 May 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21205139).

Yttrium vanadate:europium nanoprobes (YVO₄:Eu NPs) with good fluorescence properties and water solubility were synthesized by solvent thermal method. Due to the overlapping of the excitation spectrum of YVO₄:Eu NPs and the absorption spectrum of tryptophan, fluorescent internal filter effect (IFE) occurred, in which YVO₄:Eu NPs were the fluorophore and tryptophan was the absorber, leading the fluorescence of YVO₄:Eu NPs was quenched. Therefore, a new method for the determination of tryptophan was established by using fluorescent YVO₄:Eu as nanoprobes based on IFE. Some experimental parameters, such as the adding amount of YVO₄:Eu NPs, pH value of the reacting solution, and reacting time, were investigated. Under the optimum reaction conditions, the linear range of the method was 4.0×10^-6-4.0×10^-4 mol/L and the detection limit was 1.0×10^-6 mol/L (3σ). The content of tryptophan in the soy sauce was determined with the recovery of 95.2% and 97.3%. This method is simple, rapid, sensitive and accurate.
- Tryptophan,
- Fluorescence,
- Nanoprobes,
- Internal filter effect,
- Yttrium vanadate,
- Europium
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