Abstract
Hydrophobic ionic liquids (IL) 1-octyl-3-methylimidazole hexafluorophosphate ([OMIM] PF<sub>6</sub>) coated Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> nanoparticles was employed in magnetic solid phase extraction (MSPE) method coupled with ultraviolet visible spectrophotometry for the analysis of safranineT (ST). The results showed that safranineT was adsorbed fast by Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@[OMIM] PF<sub>6</sub> and eluted by ethanol. Different parameters, such as; pH, temperature, ionic strength, eluent type, volume and temperature were studied. This method introduced wide linear range of 15-350 ng mL<sup>-1</sup>, the correlation coefficient was 0.9991, the equations of calibration graph was A (absorbance) = 0.04+0.13c (g mL<sup>-1</sup>), the detection limit was 0.37 ng mL<sup>-1</sup> (RSD = 5.1%). The current method could be applied for the analysis of ST in food samples with satisfactory results.
Highlights
Magnetic solid phase extraction (MSPE) was that, it is a process depends on using magnetic sorbents for separation of various analytes in different volume of the sample [1] in MSPE procedures
The extraction procedure was done as follow, 10.0 mL of the working solution or aqueous sample and 0.05 g of Fe3O4@SiO2@[OMIM] PF6 -MNPs were transferred into a centrifuge tube, and the solution in the tube was subsequently shaken for 15 min at room temperature
69 Almojtaba Abd Alkhalig Ahmed Bakheet and Xia Shi Zhu: Magnetic Solid Phase Extraction Using Ionic Liquid Coated Magnetic Core Fe3O4@SiO2 Nanoparticles Followed by UV Spectrophotometry for Separation/Analysis of Safranine T in Food weighted in 4 beakers, dissolved in 40.0 mL of ethanol + 1.0 mL of ammonia
Summary
Magnetic solid phase extraction (MSPE) was that, it is a process depends on using magnetic sorbents for separation of various analytes in different volume of the sample [1] in MSPE procedures. The analyte magnetic sorbents were separated from the sample by using an external magnetic field, after being eluted by a perfect eluent [2]. It has not been reported to separate or extract ST with Fe3O4@SiO2@[OMIM] PF6. MSPE sorbents (Fe3O4@SiO2@ [OMIM] PF6) were prepared, these sorbents have the property of the ionic liquids and (MNPs). Esafranin% on Fe3O4@SiO2@ [OMIM] PF6 showed a higher extraction efficiency, which was attributed to hydrophobicity of ionic liquids. Anew method of MSPE accompanied with UVspectrophotometry for ST separation from food samples was applied. The Fe3O4@SiO2 @ [OMIM] PF6 can be used repeatedly for 10 times
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