Three-dimensional assembly and disassembly of Fe3O4-decorated porous carbon nanocomposite with enhanced transversal relaxation for magnetic resonance sensing of bisphenol A

Magnetic Relaxation Switch Biosensors Based on Self-Assembly of Polystyrene Microspheres and Magnetic Nanoparticles for Detection of Bisphenol A

“…The novelty of this method is that the formation of the DNA hydrogel causes the magnetic probes to aggregate, which changes the relaxation signal of the surrounding water proton. Xu designed a novel MRS sensor based on nanoporous Fe 3 O 4 @NPC nanoparticles that was confirmed with enhanced transversal relaxation. But the stability or high cost of Fe 3 O 4 @NPC and the antibody affects its practical application.…”

Magnetic Relaxation Switching Immunosensors via a Click Chemistry-Mediated Controllable Aggregation Strategy for Direct Detection of Chlorpyrifos

“…14−16 Chromatography analyses are accurate and reliable but with complex sample preparation and high requirements for operation. 17 Other detection methods include immunoassay-based methods 18,19 and biosensor-based methods. 20,21 Compared with other detection methods, biosensors such as optical sensors, electrochemical sensors, and molecularly imprinted polymer sensors have drawn growing interest due to their ultrasensitivity, high stability, and simplicity for the rapid detection of pesticides.…”

“…To determine the contamination level of CPF residues in foods, the gold standard for quantifying CPF is chromatography analysis. − Chromatography analyses are accurate and reliable but with complex sample preparation and high requirements for operation . Other detection methods include immunoassay-based methods , and biosensor-based methods. , Compared with other detection methods, biosensors such as optical sensors, electrochemical sensors, and molecularly imprinted polymer sensors have drawn growing interest due to their ultrasensitivity, high stability, and simplicity for the rapid detection of pesticides. − Among them, magnetic relaxation switching (MRS) sensors are homogeneous, light-independent, and easy to operate without pretreatment . The classical sensing logic of MRS immunosensors relies on the change of the state of magnetic nanoparticles (MNPs), which further affects the transverse magnetic relaxation time ( T 2 ) of the surrounding water molecules to achieve quantitative analysis .…”

Magnetic relaxation switching assay based on three-dimensional assembly of Fe3O4@ZIF-8 for detection of cadmium ions

“…Based on our previous findings, MOFs magnetic nanoporous materials (Fe 3 O 4 @NPC) are excellent signal labels for enhanced magnetic relaxation switch signals that can be applied to MRS sensors. 36 But, the poorly dispersed and low r 2 value of these magnetic nanoporous materials problems for the MRS sensor detection performance. Therefore, synthesizing novel MOFs magnetic nanoporous materials with higher magnetic relaxation performances is crucial for improving the performance of MRS sensors.…”