In this work, we present a fast, simple and selective method for the extraction/preconcentration determination of five opium alkaloids. This is based on combination dispersive solid phase extraction with magnetic molecularly imprinted polymers (MMIP) via high performance liquid chromatography. The surface modified Fe3O4 nanoparticles were synthesised in-situ, from co-precipitation by addition m...

DOI: 10.1002/elps.202000086 The cover picture shows the determination of four alkyl sulfate (AS) surfactants (C14, C12, C10, and C8) by capillary electrophoresis (CE) after preconcentration simultaneous adsorption AS on Al2O3 surface. EOF electroosmotic flow (EOF) at high pH pushes move to contactless conductivity detector (C4D). electropherograms show separation in order C14, C8.

This work assesses the use of modified natural natrolite zeolite as an adsorptive material for the separation and preconcentration of trace amounts of ions. In this work we investigated the potential of modified natural natrolite zeolite for the simultaneous separation and preconcentration of trace amounts of copper and zinc ions. We have developed a simple, rapid, selective, sensitive and econ...

In this study, a new procedure, based on on-line solid-phase extraction (SPE) and analysis by liquid-chromatography-atmospheric pressure chemical ionization-mass spectrometry (LC-APCI-MS), has been developed for the simultaneous, multianalyte determination of 21 selected pesticides, phenols and phthalates in water. SPE was carried out on polymeric PLRP-s cartridges by percolating 20 mL-samples....

In this work we describe a novel and simple self-assembly process of colloidal silica beads to create a nanofluidic junction between two microchannels. The nanoporous membrane was used to induce ion concentration polarization inside the microchannel and this electrokinetic preconcentration system allowed rapid concentration of DNA samples by ~1700 times and of protein samples by ~100 times with...

The aim of this study is to prepare and characterize two types of silver-functionalized carbon nanofiber (CNF) composite electrodes, i.e., silver-decorated CNF-epoxy and silver-modified natural zeolite-CNF-epoxy composite electrodes suitable for ibuprofen detection in aqueous solution. Ag carbon nanotube composite electrode exhibited the best electroanalytical parameters through applying precon...

a sensor, based on multi-wall carbon nanotubes modified glassy carbon electrode (mwcnt/gce), was developed for determination of fenitrothion. determining the surface area of mwcnt/gce showed that this surface is three times more active than that of a glassy carbon electrode. the experimental parameters, such as the amount of mwcnts, ph of the fenitrothion solution, preconcentration potential an...

Preconcentration of biomolecules by electrokinetic trapping at the nano/microfluidic interface has been extensively studied due to its significant efficiency. Conventionally, sample preconcentration takes place in continuous flow and therefore suffers from diffusion and dispersion. Encapsulation of the preconcentrated sample into isolated droplets offers a superior way to preserve the sample co...

Selective polymeric extractants were prepared for preconcentration of Cibacron reactive red dye, a dye that is often applied with Cibacron reactive blue and Cibacron reactive yellow for dyeing of fabrics. The best extractant was fabricated (in chloroform) using methacrylic acid (as monomer), ethylene glycol dimethacrylate (as crosslinker), AIBN (as initiator for polymerization), and red dye as ...