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Detection of Malachite Green Residues in Aquatic Products Based on Fluorescence of Rare Earth Complexes
Abstract
A rare earth complex was synthesized using α-thiophenoyltrifluoroacetone and o-phenanthroline as ligands. The complex was characterized by thermogravimetric analysis, infrared spectra, elemental analysis, and X-ray powder diffraction. The fluorescence spectra showed that the complex produced the characteristic fluorescence emission of Eu3+ ions at 615 nm, highly overlapping with the absorption peak of malachite green to cause fluorescence quenching. Fluorescence lifetime confirmed that the quenching mechanism is a fluorescence resonance energy transfer at low concentration, and fluorescence resonance energy transfer and inner filter effect at high concentration. The complex could exclude the interference of other aquaculture fish drugs and has a specific selectivity for malachite green. Response time was within 1 min, and the linear range was 0.1–70 μmol/L. Detection limit was calculated to be 0.023 μmol/L (3σ/k, n = 9). Spiked recoveries of malachite green in water and fish were in the range of 89.2–98.6%, indicating that the complex could be used as a fluorescent probe for the detection of malachite green residues.
Supporting agencies: This research was supported by the Foundation from the Natural Science Foundation of Fujian Province of China (2023J01778), the Foundation from the Natural Science Foundation of Xiamen City of China (3502Z202373026), and the Undergraduate Training Programs for Innovation and Entrepreneurship (2023xj003).
About the Authors
Jia Jia Xu
College of Ocean Food and Biological Engineering, Jimei University
China
China
Xiamen
Ke Man Shao
College of Ocean Food and Biological Engineering, Jimei University
China
China
Xiamen
Su Yan Chen
College of Ocean Food and Biological Engineering, Jimei University
China
China
Xiamen
Zheng Zhong Lin
College of Ocean Food and Biological Engineering, Jimei University
China
China
Xiamen
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Review
For citations:
Xu J., Shao K., Chen S., Lin Zh. Detection of Malachite Green Residues in Aquatic Products Based on Fluorescence of Rare Earth Complexes. Zhurnal Prikladnoii Spektroskopii. 2025;92(5):701.
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