scholarly journals Magnetic Graphene Oxide Composite for the Microextraction and Determination of Benzophenones in Water Samples

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 168
Author(s):  
Alejandro Medina ◽  
Francisco Antonio Casado-Carmona ◽  
Ángela I. López-Lorente ◽  
Soledad Cárdenas
Keyword(s):  
Graphene Oxide ◽  
Magnetite Nanoparticles ◽  
Water Samples ◽  
Hydrophobic Interactions ◽  
Solid Phase ◽  
Magnetic Graphene Oxide ◽  
Hybrid Nanomaterial ◽  
Transmission Electron ◽  
Relative Standard ◽  
Tandem Mass Spectrometric

Magnetite nanoparticles (Fe3O4) functionalized with graphene oxide (GO) have been synthesized through a silanization process of the magnetic nanoparticles with tetraethyl orthosilicate and (3-aminopropyl)triethoxysilane and further coupling of GO. The synthesized nanomaterials have been characterized by several techniques, such as transmission electron microscopy (TEM), and infrared and Raman spectroscopy, which enabled the evaluation of the different steps of the functionalization process. The hybrid nanomaterial has been employed for the extraction of five benzophenones (benzophenone-1, benzophenone-3, 4-hydroxybenzophenone, benzophenone-6 and benzophenone-8) in aqueous samples by dispersive micro-solid phase extraction, combining the magnetic properties of magnetite nanoparticles with the excellent sorption capacity of graphene oxide via hydrophobic interactions with the analytes. The subsequent separation and quantification of the analytes was performed by liquid chromatography with tandem mass spectrometric detection, achieving limits of detection (LODs) in the range 2.5 to 8.2 μg·L−1, with relative standard deviations ranging from 1.3–9.8% and relative recovering in the range 86 to 105%. Positive swimming pool water samples analysed following the developed method revealed the presence of benzophenones in from 14.3 to 39 μg·L−1.

scholarly journals An easily prepared graphene oxide–ionic liquid hybrid nanomaterial for micro-solid phase extraction and preconcentration of Hg in water samples

2018 ◽  
Vol 10 (3) ◽  
pp. 338-346 ◽  
Author(s):  
Annaly Cruz Sotolongo ◽  
Estefanía M. Martinis ◽  
Rodolfo G. Wuilloud
Keyword(s):  
Ionic Liquid ◽  
Graphene Oxide ◽  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Phase Extraction ◽  
Hybrid Nanomaterial ◽  
Sensitive Determination

High retention of Hg and sensitive determination with a graphene oxide–ionic liquid hybrid nanomaterial.

scholarly journals Validation of a Solid-Phase Extraction and Ultra-Performance Liquid Chromatographic Tandem Mass Spectrometric Method for the Detection of 16 Glucocorticoids in Pig Tissues

2009 ◽  
Vol 92 (2) ◽  
pp. 604-611 ◽  
Author(s):  
Bing Shao ◽  
Xiaoliang Cui ◽  
Yi Yang ◽  
Jing Zhang ◽  
Yongnin Wu
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Monitoring Program ◽  
Ion Source ◽  
Tandem Mass ◽  
Phase Extraction ◽  
Mass Spectrometric Method ◽  
Relative Standard ◽  
Liver And Kidney ◽  
Tandem Mass Spectrometric

Abstract A sensitive analytical method has been developed and validated for simultaneous determination of 16 glucocorticoid (fluorometholone, flumethasone, triamcinolone, aldosterone, clobetasol propionate, methylprednisolone, fluocinolone acetonide, hydrocortisone, prednisone, dexamethasone, beclomethasone, prednisolone, budesonide, triamcinolone acetonide, fludrocortisone acetate, and cortisone) residues in pig tissues (muscle, liver, and kidney). These biosamples were hydrolyzed with -glucuronidase/arylsulfatase enzyme and passed through a Supelclean ENVI-Carb graphitized carbon black solid-phase extraction cartridge, followed by further purification using aminopropyl cartridges. Analytes were separated on an ultra-performance liquid chromatography BEH C18 column followed by tandem mass spectrometry (MS) with an electrospray ion source. The MS data acquisition was performed in the negative multireaction monitoring mode by a time-scheduled multireaction monitoring program. The assay for the 16 glucocorticoids were linear over the range of 1250 g/L for pork, liver, and kidney, with correlation coefficient >0.99. Estimated detection limits for the target analytes ranged from 0.03 to 0.30 g/kg, and limits of quantitation ranged from 0.10 to 1.00 g/kg. Recoveries of the glucocorticoids (spiked at levels of 0.4 and 2.0 g/kg) ranged from 81.0 to 112.3, with relative standard deviations between 2.6 and 16.6.

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