UiO-66-NH₂ based fluorescent sensing for detection of tetracyclines in milk

Abstract

We have developed a UiO-66-NH2 fluorescent sensor by a simple microwave-assisted method. The synthetic UiO-66-NH2 sensor has good sensitivity and selectivity for tetracyclines determination in milk samples.

Luminescence Nanothermometry: Investigating Thermal Memory in UiO-66-NH2 Nanocrystals

“…Additionally, the time scan of the MOF in deionized water showed no response, further indicating that the observed thermal response is specific to the MOF’s assembly environment (Figure S8). This observation was also reported by Wang and Wang who observed no changes in the fluorescent signal of UiO-66-NH 2 upon heating in pure water in the absence of HEPES …”

“…This observation was also reported by Wang and Wang who observed no changes in the fluorescent signal of UiO-66-NH 2 upon heating in pure water in the absence of HEPES. 47 As depicted in Figure 6A, the fluorescence intensity of UiO-66-NH 2 was measured in matrices of 1 mM, 5 mM, 10 mM, and 50 mM HEPES buffers all with 150 mM NaCl, as well as in deionized water. These measurements were taken at ambient temperature (20 °C), after heating to 70 °C, and following a cooling period back to 20 °C.…”

“…This observation was also reported by Wang and Wang who observed no changes in the fluorescent signal of UiO-66-NH 2 upon heating in pure water in the absence of HEPES. 47 …”

A Turn-Off Fluorescent Biomimetic Sensor Based on a Molecularly Imprinted Polymer-Coated Amino-Functionalized Zirconium (IV) Metal–Organic Framework for the Ultrasensitive and Selective Detection of Trace Oxytetracycline in Milk

“…The FT-IR spectra were recorded in order to analyze the surface chemistry of the synthetic materials. As presented in Figure 1g, in the spectrum of NH2-UIO-66 (Zr), the characteristic peaks at 3492 and 3373 cm −1 can be attributed to the antisymmetric and symmetric stretching modes of -NH2, respectively [8,40]. The absorption bands in the range of 1400-1500 cm −1 originated from a C=C stretching vibration in the benzene ring of the ATA ligand [14,15].…”

“…Wang et al designed a novel ratio FL probe based on fluorescent Zr-MOF for the highly sensitive determination of dopamine and reduced glutathione [5]. Wang et al stated clearly that the NH 2 -UIO-66 fluorescent sensor was triumphantly prepared and applied for the FL sensing of tetracyclines in milk [8]. Although these NH 2 -UIO-66 (Zr)-based optical sensors showed gratifying FL sensing performances, there were still some limitations, such as a relatively low selectivity for target analytes and a weak anti-interference capability in elaborate actual samples.…”