A sensitive electrochemical bisphenol A sensor based on molecularly imprinted polydopamine-coated Fe3O4 microspheres

A new strategy for RRS-based determination of phosphate with a bifunctional Fe3O4 magnetic nanoparticle surface molecularly imprinted polydopamine probe

“…The FTIR peaks at 582 cm −1 and 3411 cm −1 correspond to the stretching vibration of the Fe–O bond and –OH bond of Fe 3 O 4 magnetic nanomaterials, respectively, 12 while 1481 cm −1 is attributed to the stretching vibration of CC in the benzene ring and 3233 cm −1 corresponds to the stretching vibration of the N–H bond, indicating that PD was successfully loaded onto the surface of Fe 3 O 4 . 11 1635 cm −1 corresponds to the stretching vibration of CO, 8 while 788–870 cm −1 was attributed to the stretching vibration of Mo–O–Mo, indicating that PMo was successfully loaded on the surface of the Fe 3 O 4 material. 28 Fe 3 O 4 @MIP has the same absorption band, indicating that the template molecules in the material are not completely eluded.…”

“…The self-polymerization of polydopamine can reduce the concerns about the selection of functional monomers, crosslinkers and initiators in the preparation of molecular imprinting materials to a certain extent and make the preparation of materials more simple, rapid and environmentally friendly. By imprinting bisphenol A (BPA) on the surface of Fe 3 O 4 nanoparticles through dopamine self-polymerization, Wei 11 constructed a low-cost and efficient electrochemical sensor based on Fe 3 O 4 @PDA MIMs, which can be used for the detection of BPA with a linear range of 1 × 10 −11 to 1 × 10 −3 M. The detection limit (DL) is 5.78 × 10 −12 M. Seddaoui 12 combined magnetic nanoparticles as a solid substrate with polydopamine as a coating polymer to prepare an immunomagnetic probe for the screening of pork in adulterated meat. To the best of our knowledge, there is no method for the determination of PO 4 3− by the RRS probe using nanomaterials imprinted with polydopamine on the surface of magnetic molecules.…”

A Wireless, CRISPR-Polymer Dot Electrochemical Sensor for the Diagnosis of Bacterial Pneumonia and Multi-Drug Resistance

“…Electrochemical sensors can provide a versatile diagnostic platform for various disease targets due to the high sensitivity and reliability . However, the previous methods have used materials with poor water solubility and limited modification capabilities. − Polymer dot nanoparticles (PDs) have been developed as an alternative to semiconductor quantum dots (SQDs) to overcome the toxicity associated with heavy metals . PDs exhibit excellent water solubility and electroconductivity, rendering them great advantages as sensing materials. − Moreover, PDs can be endowed with diverse functions via surface modification, such as stimuli responsiveness, adhesion to targets, or selective binding of analytes …”

Polydopamine-Coated Solid Silica Nanoparticles Encapsulating IR-783 Dyes: Synthesis and NIR Fluorescent Cell Imaging

“…The deposited PDA layer allows easy and rapid modification with functional ligands through Schiff base reactions and/or Michael addition even on the NP surface . For example, PDA-coated NPs were chemically modified with polyethylene glycol to enhance their colloidal characteristics. , Additionally, planar aromatic compounds such as doxorubicin and methylene blue can be loaded in the PDA layer, facilitated by hydrophobic interactions and π–π stacking. , Indocyanine green (ICG), a representative NIR fluorescent dye, is also physically encapsulated into PDA-coated NPs. , ICG is a FDA-approved NIR fluorescent dye used in bioimaging for medical diagnosis (FDA, U.S. Food and Drug Administration), but this dye incorporates poorly into SiO 2 NPs using conventional methods due to strong electrostatic repulsion between sulfonates of ICG and silanol groups of SiO 2 NPs . However, ICG loading of PDA-coated mesoporous SiO 2 NPs ( m -SiO 2 NPs) is possible using room-temperature physical adsorption .…”

“… 18 , 19 Additionally, planar aromatic compounds such as doxorubicin and methylene blue can be loaded in the PDA layer, facilitated by hydrophobic interactions and π–π stacking. 20 , 21 Indocyanine green (ICG), a representative NIR fluorescent dye, is also physically encapsulated into PDA-coated NPs. 22 , 23 ICG is a FDA-approved NIR fluorescent dye used in bioimaging for medical diagnosis (FDA, U.S. Food and Drug Administration), 24 but this dye incorporates poorly into SiO 2 NPs using conventional methods due to strong electrostatic repulsion between sulfonates of ICG and silanol groups of SiO 2 NPs.…”