Cholesteric Molecular Tweezer Artificial Receptor for Rapid and Highly Selective Detection of Ag<sup>+</sup> in Food Samples
Chiral cholesteric molecular tweezer <b>7a</b> was synthesized, and its recognition properties for Ag<sup>+</sup>, Al<sup>3+</sup>, Ca<sup>2+</sup> etc., were investigated by UV and fluorescence spectra. The results showed that in ethanol/Tris (1/1, &l...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/6d9900ee43cf4704afa1e906eca9a449 |
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| Sumario: | Chiral cholesteric molecular tweezer <b>7a</b> was synthesized, and its recognition properties for Ag<sup>+</sup>, Al<sup>3+</sup>, Ca<sup>2+</sup> etc., were investigated by UV and fluorescence spectra. The results showed that in ethanol/Tris (1/1, <i>v</i>/<i>v</i>, pH 7.0) buffer solution, the host molecular tweezer <b>7a</b> had a specific recognition ability for Ag<sup>+</sup>, the detection limit was up to 1 × 10<sup>−6</sup> mol/L, and other metal ions had little effect on Ag<sup>+</sup> recognition. At the same time, the naked-eye detection of Ag<sup>+</sup> was realized by the light red color of the complex solution. Furthermore, the mechanism of recognition of Ag<sup>+</sup> by molecular tweezer <b>7a</b> was studied by a nuclear magnetic titration test and computer molecular simulation, and a rapid detection method of Ag<sup>+</sup> using host molecular tweezer <b>7a</b> was established. Through the determination of Ag<sup>+</sup> in milk powder, quinoa and other food samples, it was proved that this novel method had a good application prospect for the detection of Ag<sup>+</sup> in food. |
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