‌Discrimination of Triphenylmethane Drug in Aquatic Products Using Fluorescence Sensor Array Based on Rare-Earth...

Four rare-earth complexes were prepared using Eu³⁺ and Tb³⁺ as central rare-earth ions and benzoic acid, furoic acid, α-thenoyltrifluoroacetone, and phenanthroline as organic ligands, and a four-channel fluorescent sensor array was constructed for the identification of triphenylmethane drugs. The four sensing units have different degrees of fluorescence response to six triphenylmethane drugs. The fluorescence quenching of Eu(III) complex by malachite green and Tb(III) complex by methyl violet were confirmed to be the FRET effect. After five parallel experiments, a 4 × 6 × 5 fluorescence data matrix was obtained, and the linear discriminant method were used to distinguish six triphenylmethane drugs at 0.1, 1.0, and 10 µmol L⁻¹ and mixed triphenylmethane drugs at 1.0 µmol L⁻¹ with an accuracy rate of 100%. The array achieved the identification of triphenylmethane drugs in fish samples with accuracy rate of 97.4%.