4′-Aminobenzo-18-crown-6 functionalized magnetic nanoparticles as a solid-phase extraction adsorbent for the determination of Pb2+

2019 ◽  
Vol 11 (13) ◽  
pp. 1735-1742 ◽  
Author(s):  
Jing-yan Kang ◽  
Wei Ha ◽  
Hai-xia Zhang ◽  
Yan-ping Shi
Keyword(s):  
Magnetic Nanoparticles ◽  
Solid Phase Extraction ◽  
Mannich Reaction ◽  
Solid Phase ◽  
Phase Extraction ◽  
Magnetic Adsorbent ◽  
Selective Determination ◽  
Functionalized Magnetic Nanoparticles ◽  
The Mannich Reaction

A novel magnetic adsorbent for Pb2+ was synthesized based on 4′-aminobenzo-18-crown-6 (AB18C6) and Fe3O4–CHO via the Mannich reaction. It showed excellent adsorption and selectivity for Pb2+, and the established MSPE method had excellent potential, displaying the selective determination of trace Pb2+ from apples, milk and rice.

Development of an on-line solid phase extraction method based on new functionalized magnetic nanoparticles. Use in the determination of mercury in biological and sea-water samples

Talanta ◽  
2016 ◽  
Vol 153 ◽  
pp. 228-239 ◽  
Author(s):  
Elisa Vereda Alonso ◽  
M.M. López Guerrero ◽  
Pilar Colorado Cueto ◽  
José Barreno Benítez ◽  
José Manuel Cano Pavón ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Solid Phase Extraction ◽  
Water Samples ◽  
Extraction Method ◽  
Sea Water ◽  
Solid Phase ◽  
Phase Extraction ◽  
Functionalized Magnetic Nanoparticles ◽  
On Line

scholarly journals Hybrid Solid-Phase Extraction for Selective Determination of Methamphetamine and Amphetamine in Dyed Hair by Using Gas Chromatography–Mass Spectrometry

Molecules ◽  
2019 ◽  
Vol 24 (13) ◽  
pp. 2501 ◽  
Author(s):  
Nam Hee Kwon ◽  
Yu Rim Lee ◽  
Hee Seung Kim ◽  
Jae Chul Cheong ◽  
Jin Young Kim
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Gas Chromatography Mass Spectrometry ◽  
Phase Extraction ◽  
Selective Determination ◽  
Chromatography Mass Spectrometry ◽  
Hair Samples

Sample preparation is an important step in the isolation of target compounds from complex matrices to perform their reliable and accurate analysis. Hair samples are commonly pulverized or processed as fine cut, depending on preference, before extraction by techniques such as solid-phase extraction (SPE), liquid–liquid extraction, and other methods. In this study, a method based on hybrid solid-phase extraction (hybridSPE) and gas chromatography–mass spectrometry (GC–MS) was developed and validated for the determination of methamphetamine (MA) and amphetamine (AP) in hair. The hair samples were mechanically pulverized after washing with de-ionized water and acetone. The samples were then sonicated in methanol at 50 °C for 1 h and centrifuged at 50,000× g for 3 min. The supernatants were transferred onto the hybridSPE cartridge and extracted using 1 mL of 0.05 M methanolic hydrogen chloride. The combined solutions were evaporated to dryness, derivatized using pentafluoropropionic anhydride, and analyzed by GC–MS. Excellent linearity (R2 > 0.9998) was achieved in the ranges of 0.05–5.0 ng/mg for AP and 0.1–10.0 ng/mg for MA. The recovery was 83.4–96.8%. The intra- and inter-day accuracies were −9.4% to 5.5% and −5.1% to 3.1%, while the intra- and inter-day precisions were within 8.3% and 6.7%, respectively. The limits of detections were 0.016 ng/mg for AP and 0.031 ng/mg for MA. The validated hybridSPE method was applied to dyed hair for MA and AP extraction and compared to a methanol extraction method currently being used in our laboratory. The results showed that an additional hybridSPE step improved the recovery by 5.7% for low-concentration quality control (QC) samples and by 24.1% for high-concentration QC samples. Additionally, the hybridSPE method was compared to polymeric reversed-phase SPE methods, and the absolute recoveries for hybridSPE were 50% and 20% greater for AP (1.5 ng/mg) and MA (3.0 ng/mg), respectively. In short, the hybridSPE technique was shown to minimize the matrix effects, improving GC–MS analysis of hair. Based on the results, the proposed method proved to be effective for the selective determination of MA and AP in hair samples.

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