High-Performance Liquid Chromatographic Determination of Diazinon after Its Magnetic Dispersive Solid-Phase Microextraction Using Magnetic Molecularly Imprinted Polymer

Preparation of magnetic mesoporous silica composite for the solid‐phase microextraction of diazinon and malathion before their determination by high‐performance liquid chromatography

“…Then, 5 mL of NH 4 OH (32% w/w) and 2.0 mL of TEOS were added, and the mixture was left to react for 12 h at the room temperature. The resulting SiO 2 ‐coated Fe 3 O 4 nanoparticles were then separated by an external magnet, thoroughly washed with ethanol and deionized water, and dried in the vacuum at 60°C . In step (2), the prepared SiO 2 ‐coated Fe 3 O 4 nanoparticles (0.3 g) were dispersed in a mixture of 90 mL water and 40 mL ethanol by sonication for 20 min, followed by addition of 2.3 g CTAB and 11 mL of concentrated ammonia solution.…”

“…However, due to the very low concentration of OPPs in environmental samples as well as the matrices interferences, their direct determination by chromatographic methods, such as HPLC and GC, is not possible and a separation/preconcentration step is often necessary. Several pretreatment methods including cloud point extraction [5], dispersive liquid–liquid microextraction , headspace solid‐phase microextraction , SPE , and SPME have been reported for the separation, enrichment, and sample cleanup of the OPPs residue in various matrices. SPE and SPME are the most extensively used sample pretreatment method with the advantages of short extraction time, safety, low consumption of organic solvent, simplicity, and possibility of achieving high enrichment factor .…”

Magnetic molecularly imprinted polymers for the detection of aminopyralid in milk using dispersive solid-phase extraction

“…Aer shaking the mixture, the MMIP that adsorbs the target substance is isolated from the solution using an external magnetic eld. 22,23 Compared with other pretreatment methods, MI-MDSPE combines the quick separation of magnetic particles and special selectivity of MIPs and has high specicity and simple method procedures.…”

Synthesis of a molecularly imprinted polymer on mSiO2@Fe3O4 for the selective adsorption of atrazine

“…Surface-imprinted polymers can provide high-binding capacities and fast mass transfer due to the easy accessibility to recognition sites and the homogeneous distribution of binding sites [12][13][14][15]. Various solid supporters have been used for imprinting MIPs on their surfaces, including SiO 2 [16], Fe 3 O 4 [17], carbon nanotubes [18], and so on. Because the binding capacity of a surface-grafting MIP layer is greatly dependent on the surface area of solid support, it is better to choose materials with large surface area for preparing an MIP.…”