An optical chemosensor for nano-level determination of Pb2+ and Cu2+ in aqueous media and its application in cell imaging

Dispersive micro solid phase extraction of glibenclamide from plasma, urine, and wastewater using a magnetic molecularly imprinted polymer followed by its determination by a high-performance liquid chromatography-photodiode array detector

“…Thermodynamic studies were performed at four temperatures of 10, 20, 30, and 40 °C under optimal conditions to determine the Gibbs free energy (Δ G ), enthalpy (Δ H ), and entropy (Δ S ). These were determined using following equations: 23 Δ G ° = − RT ln K C where C e is the equilibrium concentration of the GLB solution (mg L −1 ); K C is the equilibrium constant, and q e is the equilibrium sorption capacity (mg g −1 ). Δ G ° (kJ mol −1 ), Δ S ° (kJ mol −1 K −1 ), and Δ H ° (kJ mol −1 ) are the Gibbs free energy, entropy, and enthalpy changes in sorption, respectively; T is the absolute temperature (K), and R is the universal gas constant (8.314 J mol −1 K −1 ).…”

“…21 Furthermore, magnetic sorbents can be easily reused and recycled, making them both cost-effective and eco-friendly. 22,23 Until now, different non-magnetic or magnetic sorbents, such as S@SnO 2 -NPs, 13 Fe 3 O 4 @PPy NPs, 24 CoFe 2 O 4 / MCM-48/chitosan, 25 and SiO 2 -coated Fe 3 O 4 , 26 have been utilized for SPE of glibenclamide from various media.…”

“…Magnetic iron nanoparticles (Fe 3 O 4 ), SiO 2 @Fe 3 O 4 nanoparticles, SiO 2 -MPS@Fe 3 O 4 , MMIP, and MNIP were fabricated using the precipitation polymerization method according to previous works with some modication. 22,23 The schematic of MMIP synthesis is shown in Fig. 1.…”

“…The pH was then adjusted to 8.0 and subjected to extraction and analysis. 22,23 3. Results and discussion…”

Preparation of surface molecularly‐imprinted magnetic kaolin for selective separation and determination of thiabendazole

“…Moreover, the direct addition and dispersion of magnetic sorbents into the sample solution in MSPE significantly enhance the interaction surface area between analytes and sorbents. 20 To date, various conventional analytical techniques have been developed for the quantification of TBZ in real samples. These methods include high-performance liquid chromatography (HPLC), 21 HPLC-mass spectrometry, 22 electroanalytical methods, 23 and capillary electrophoresis.…”