A magnetic nanoscale metal–organic framework (MNMOF) as a viable fluorescence quencher material for ssDNA and for the detection of mercury ions via a novel quenching–quenching mechanism

Abstract

Here, we propose a magnetic nanoscale metal–organic framework as a novel quenching material and reveal its quenching–quenching mechanism. It sensitively and selectively binds Hg(ii) and a detection limit of 8 nM.

Ag@CuO@Cu(OH)2: A Synergistic Catalyst for H2O2 Detection with Peroxidase‐Mimic Activity without Interference of O2

“…Further, the binding energies Ag3d has main peaks at 369.4 and 375.5 eV belong to Ag 3d 5/2 and Ag 3d 3/2 . This corresponds to metallic Ag 0 that generate AgNPs [28] . The HR‐XPS spectrum of Cu2p of Ag@CuO@Cu(OH) 2 was well fit two major peaks at 934.9 and 955.0 eV ascribed with Cu 2p 3/2 and Cu2p 1/2 that confirms octahedral Cu 2+ existed in Ag@CuO@Cu(OH) 2 [29] .…”

Nanoscale Metal-Organic Frameworks as Fluorescence Sensors for Food Safety

“…Mercury is known as one of the most toxic heavy metals, which could cause severe harm to people. Recently, novel NMOF probes were presented for selectively sensing of Hg 2+ basing on fluorescein amidite (FAM)-labeled ssDNA(5′-56-FAM-ATT TGT TTT GTT TCC CCT TTC TTC TTT TCT TTT-3′) and NH 2 -MIL-101(Fe)@Fe 3 O 4 [ 110 ]. FAM-ssDNA exhibits a strong fluorescence emission under UV-light.…”

“… ( a ) Schematic illustration of the process for encapsulating the lanthanide complex modified Fe 3 O 4 into ZIF-8 and concept for sensing Cu 2+ , reprinted with modifications from Wang et al [ 99 ]; ( b ) schematic illustration of the fabrication of UiO-(OH) 2 @RhB and the sensing process to Al 3+ , reprinted with modifications from Zheng et al [ 110 ]; ( c ) schematic of the fluorescence quenching and recovery mechanisms of NH 2 -MIL-125, reprinted with modifications from Venkateswarlu et al [ 113 ]. …”

Synthesis of Magnetic Metal-Organic Frame Material and Its Application in Food Sample Preparation

“…By combining with flame atomic absorption spectrometry (FAAS), the developed MSPE method obtained the lower LODs (0.07-0.5 mg/kg), lower quantification limits (0.2-2.0 mg/kg), wide linear ranges (0.25-250 mg/kg) and good extraction recoveries (97.5-99.0%). Figure 11b illustrated a DNA fluorescence assay comprising a MMOFs functionalized with fluorescein amidite (FAM)-labeled ssDNA for Hg 2+ detection [186]. The fluorescence intensity showed a drastic decrease upon the presence of Hg 2+ .…”

“…Copyright Journal of Hazardous Materials, 2019. (b) Schematic illustration of the DNA fluorescence assay with MMOFs as a sensing platform [186]. Copyright RSC Advances, 2020.…”