Journal
ANALYTICAL CHEMISTRY
Volume 84, Issue 16, Pages 7233-7240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac301660k
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Funding
- European Union (ERC Advanced Grant SPINMOL)
- Spanish Ministerio de Economia y Competitividad [CTQ 2011-26760, CTQ 2011-26507, MAT2007-51584, MAT2011-22785, CSD2007-00010]
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We report a new in-tube solid phase microextraction approach named magnetic in-tube solid phase microextraction, magnetic-IT-SPME. Magnetic-IT-SPME has been developed, taking advantage of magnetic microfluidic principles with the aim to improve extraction efficiency of IT-SPME systems. First, a magnetic hybrid material formed by Fe3O4 nanoparticles supported on SiO2 was synthesized and immobilized in the surface of a bared fused silica capillary. column to obtain a magnetic adsorbent extraction phase. The capillary column was placed inside a magnetic coil that allowed the application of a variable magnetic field. Acetylsalicylic acid, acetaminophen, atenolol, diclofenac, and ibuprofen were tested as target analytes. The application of a controlled magnetic field resulted in quantitative extraction efficiencies of the target analytes between 70 and 100%. These results demonstrated that magnetic forces solve the low extraction efficiency (10-30%) of IT-SPME systems, which is one of their main drawbacks.
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