期刊
FOOD CHEMISTRY
卷 278, 期 -, 页码 523-532出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2018.11.086
关键词
Tetracycline; Milk; Carbon dots; Fluorescence; Confocal microscopy; Detection of Al3+; Bacterial samples
资金
- Direccion General de Asuntos de Personal Academico (Project PAPIIT) [IN209616]
- CONACYT-DST [266150]
- CONACYT
We developed a technique that detects Al3+ in milk/bio-samples, and reversibly applied to recognize tetracycline (TC) in milk, enhancing the fluorescence intensity without interference from other cations (Cd2+, Ni2+, Co2+, Sr2+, Mg2+, Fe3+, K+, Sm3+, Ag+, Na+, Ba2+, Cr3+, Zn2+ and Mn2+); the limit of detection (LOD) is found to be 0.00022 mM with r(2)=0.9439. The detection of Al3+ is tested in milk as well as in living cells (Saccharomyces cerevisiae and Debaryomyces spp.) by TC or by its quantum dots. This is consistent with the molecular orbital, revealing that the lowering of the energy of HOMO (Highly Occupied Molecular Orbital) discourages the electron transfer from HOMO of fluorophore to HOMO of excited states of Al-complex that increases the fluorescent intensity. Interestingly, carbon dots (CDs) generated from TC also recognize Al3+ as its LOD is as low as to 0.00050 mM with r(2) of 0.9404.
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