A Novel Tb@Sr-MOF as Self-Calibrating Luminescent Sensor for Nutritional Antioxidant

Abstract

Sesamol, is well-known antioxidant and can reduce the rate of oxidation and prolong expiration date. It is also potentially antimutagenic and antihepatotoxic, the detection of sesamol is important and remains a huge challenge. Herein, a new 3D alkaline earth Sr metal organic framework [Sr(BDC)·DMAC·H2O]n (BDC = benzene-1,4-dicarboxylate; DMAC = N,N-dimethylacetamide) is synthesized and a probe based on Tb3+ functionalized Sr-MOF. The Tb(3+)@Sr-MOF showed good luminescence and thermal property. Due to the energy competition between sesamol and ligand, the luminescence intensity of sesamol increases meantime luminescence intensity of Tb3+ decreases, the ratio of the emission intensities (I344/I545) linearly increases with sesamol in concentrations ranging from 1 × 10−7 to 8 × 10−4 M. Furthermore, the fluorescence-detected circular test shows that the composite Tb(3+)@Sr-MOF can serve as ratiometric sensor for sensing of sesamol. This is the first example for self-calibrated detecting sesamol based on metal-organic framework (MOF).

Post-Synthetic Functionalization of Ni-MOF by Eu3+ Ions: Luminescent Probe for Aspartic Acid and Magnetic Property

“…In previous studies, the luminescent quenching mechanism based on MOFs has been shown to be caused by structural collapse, competition absorption, or interactions between the detected objects and MOF frameworks. − The consistent PXRD results confirmed the intact skeleton after amino acid detection, indicating that the luminescence quenching was not caused by structural collapse (Figure S4). The non-overlapping UV–vis absorption spectra of aspartic acid and excitation spectra of Eu 3+ @ 1 exclude the competitive adsorption (Figure S11).…”

Nanoscale Metal-Organic Frameworks as Fluorescence Sensors for Food Safety

“…The LOD of FMOF for nitenpyram was 0.03 µg/mL. MOF-5 [Zn 4 O(BDC) 3 DEF (BDC = 1,4-benzenedicarboxylate, DEF = diethylformamide)] was designed by Kumar et al [ 67 ] for sensing a nitro group containing OPs including parathion, methyl parathion, paraoxon, and fenitrothion. MOF-5 exhibited strong green emission under the UV-light and, upon the addition of Ops, the fluorescence emission would be outstandingly quenched via the PET.…”

Luminescent Hydroxyapatite Doped with Rare Earth Elements for Biomedical Applications

“…Terbium is an essential element of the rare earth family that presents complex optical, magnetic, and electronic properties. It is also an appropriate candidate for applications in the glass industry [ 48 , 49 ], information industry [ 50 ], polymers [ 51 , 52 ], bio-chemical sensors [ 53 , 54 , 55 ], and solar cells [ 56 , 57 , 58 ]. Terbium is unavoidably present in the environment, organisms, and food chains due to its extensive development and utilization.…”