Journal of Agricultural and Food Chemistry · 2019 · 318 citations · 42 references
A fluorescent method for detection of tetracyclines (TCs) in milk was developed by using the NH<sub>2</sub>-MIL-53(Al) nanosensor synthesized via a one-pot hydrothermal method. The nanosensor had a crystalline nanoplates structure with rich groups of -NH<sub>2</sub> and -COOH. The -NH<sub>2</sub>/-COOH of NH<sub>2</sub>-MIL-53(Al) reacted with the -CO-/-OH of TCs to form a complex. The electron of -NH<sub>2</sub>/-COOH from the NH<sub>2</sub>-BDC ligand transferred to the -CO-/-OH of TCs. -NH<sub>2</sub> of the NH<sub>2</sub>-MIL-53(Al) interacted with the -CO-/-OH of TCs by hydrogen bonding. The quenching efficiency of the inner filter effect (IFE) was calculated to contribute 57-89%. The synergistic effect of photoinduced electron transfer (PET) and IFE account for fluorescence quenching. TCs were quantitatively detected in milk samples with recoveries of 85.15-112.13%; the results were in great accordance with high-performance liquid chromatography (HPLC) ( P > 0.05), confirming the NH<sub>2</sub>-MIL-53(Al) nanosensor has potential applicability for the detection of TCs in food matrix.
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Full-Color Light-Emitting Carbon Dots with a Surface-State-Controlled Luminescence Mechanism
Hui Ding, Shang‐Bo Yu, Jishi Wei et al. · ACS Nano · 2015 · 2.4K citations