Cysteamine-CdTe Quantum Dots Electrochemically Synthesized as Fluorescence Probe for Resveratrol
| Autor: | Erico Teixeira-Neto, Tailândia Maracajá Canuto Belmiro, Gustavo Souza, Denilson V. Freitas, Marcelo Navarro, André F. Lavorante, Natalia S. M. Ramos, Ana Paula S. Paim, Maria C. B. S. M. Montenegro |
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| Rok vydání: | 2018 |
| Předmět: |
Detection limit
010401 analytical chemistry chemistry.chemical_element Nanoparticle 02 engineering and technology Resveratrol 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Applied Microbiology and Biotechnology Fluorescence 0104 chemical sciences Analytical Chemistry chemistry.chemical_compound chemistry Quantum dot Cysteamine 0210 nano-technology Safety Risk Reliability and Quality Tellurium Safety Research Food Science Nuclear chemistry |
| Zdroj: | Food Analytical Methods. 11:3371-3379 |
| ISSN: | 1936-976X 1936-9751 |
| Popis: | This work proposes a fluorescent probe based on CdTe quantum dots (QDs) for the determination of resveratrol in wine samples. The synthesis of cysteamine (CA) capped CdTe QD was carried out in a one-pot eco-friendly process, resorting to the electrochemical reduction of metallic tellurium powder in a graphite macroelectrode (cavity cell). The reduced species of tellurium (Te2− and Te22−) migrated to an intermediate compartment of the electrochemical cell and in the presence of a cadmium salt and organic stabilizing agent (CA), forming the colloidal dispersion of CdTe in a single step. Under optimum synthesis conditions, the fluorescence intensity of the prepared nanoparticles varied linearly with the resveratrol concentration in the range from 3.25 to 75 μg L−1 (R2 = 0.9984), with a detection limit of 0.97 μg L−1 and RSD of 3.7% (5.0 μg L−1 resveratrol, n = 10). The method was successfully applied to the resveratrol determination in wines, with recoveries from 97.8 to 112.4%. Student’s t test was applied and no statistically significant difference was observed between the two methods (HPLC and proposed), with a confidence level of 95% (ttabulated = 2.45 and tcalculated = 0.38). The resveratrol determination method, by using CdTe-CA QDs as fluorescence probe, was simple, rapid, inexpensive, and sensitive. |
| Databáze: | OpenAIRE |
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