Magnetic solid phase extraction for chromatographic separation of carbamates

Abstract

Magnetic solid phase extraction particles (MSPE) were produced using magnetite nanoparticles with diameters between 9 and 13 nm as nucleating agent. The produced particles with magnetite cores were smaller, and more irregular and polydispersed, than those produced in the absence of the magnetite particles. The average diameters of the particles were 377 and 521 nm, respectively, for silica particles with and without magnetic core, whereas the diameters of the different grafted particles were of the same order of magnitude than the silica particles with magnetic cores. BET results indicated surface areas ranging between 9 and 37 m 2 g À1 The TGA results showed that the particles contained about 10% water and other solvents, and between 5 to 6% grafted groups. The thermal decomposition of the particles (presented under Supplementary Information) was autocatalytic with activation energies of 367, 546, and 616 kJ mol À1 for particles grafted with cyanopropyl (cyano), octyl, and trimethyl (TMS), respectively. The order of dispersity of the particles in water followed the sequence cyano > PMA > TMS ≫ octyl, whereas the pesticides removing efficiency followed the reverse order. K E Y W O R D S carbamate pesticides, functionalized particles, LC-MS, Magnetite, MSPE

Smart Synthesis of Trimethyl Ethoxysilane (TMS) Functionalized Core–Shell Magnetic Nanosorbents Fe3O4@SiO2: Process Optimization and Application for Extraction of Pesticides

“…Adsorbents were then kept on the stirrer for 1 h followed by the addition of 2 mL of trimethyl ethoxysilane (TMS) to the reaction media and incubation for 1 h. on the stirrer. The grafted mNPs were collected using the magnet, washed with water and ethanol, and then dried in the oven for two days at 70 °C [ 48 ].…”

Zeolitic imidazolate framework-8 modified magnetic halloysite nanotube-based solid phase extraction for the analysis of carbamate pesticides by ultra-high performance liquid chromatography tandem mass spectrometry

“…Various sample preparation methods have been developed for the extraction of CPs, such as dispersive liquid-liquid microextraction (DLLME), 8 solid phase extraction (SPE), [9][10][11][12] solid-phase microextraction (SPME) 13 and magnetic solid-phase extraction (mSPE). 14 mSPE is a kind of SPE technique based on the use of magnetic sorbents. In recent years, mSPE has become a widely used sample preparation method due to its rapidity, simplicity and low consumption of organic reagents.…”

Reusable and sustainable graphene oxide/metal–organic framework-74/Fe3O4/polytyramine nanocomposite for simultaneous trace level quantification of five fluoroquinolones in egg samples by high performance liquid chromatography

“…In order to overcome these weaknesses, the development a sustainable sample preparation strategy prior to measurement is essential. Magnetic dispersive micro-solid phase extraction (MD-µ-SPE) as a promising kind of solid-phase extraction (SPE) offers many merits over other traditional sample preparation methods and reveals notable applications in enrichment and isolation of target analyses from complex matrices like environmental, natural, drug and food samples [7][8][9][10]. The major advantages of this new kind of extraction method involve significant reduction of toxic reagent usage, removal of time consuming steps like filtration and centrifugation, considerable automation ability and reasonable extraction yields along with a meaningful decrease of interference effects [1].…”