scholarly journals Comparison between Exhaustive and Equilibrium Extraction Using Different SPE Sorbents and Sol-Gel Carbowax 20M Coated FPSE Media

Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 382 ◽  
Author(s):  
Angela Tartaglia ◽  
Marcello Locatelli ◽  
Abuzar Kabir ◽  
Kenneth G. Furton ◽  
Daniela Macerola ◽  
...  
Keyword(s):  
Solid Phase ◽  
Retention Volume ◽  
Sol Gel ◽  
Theoretical Plate ◽  
Retention Factor ◽  
Performance Comparison ◽  
Bioanalytical Method Validation ◽  
Breakthrough Volume ◽  
Volume Number ◽  
Hydrophilic Lipophilic Balance

This paper reports the performance comparison between the exhaustive and equilibrium extraction using classical Avantor C18 solid phase extraction (SPE) sorbent, hydrophilic-lipophilic balance (HLB) SPE sorbent, Sep-Pak C18 SPE sorbent, novel sol-gel Carbowax 20M (sol-gel CW 20M) SPE sorbent, and sol-gel CW 20M coated fabric phase sorptive extraction (FPSE) media for the simultaneous extraction and analysis of three inflammatory bowel disease (IBD) drugs that possess logP values (polarity) ranging from 1.66 for cortisone, 2.30 for ciprofloxacin, and 2.92 for sulfasalazine. Both the commercial SPE phases and in-house synthesized sol-gel CW 20M SPE phases were loaded in SPE cartridges and the extractions were carried out under an exhaustive extraction mode. FPSE was carried out under an equilibrium extraction mode. The drug compounds were resolved using a Luna C18 column (250 mm × 4.6 mm; 5 m particle size) in gradient elution mode within 20 min and the method was validated in compliance with international guidelines for the bioanalytical method validation. Novel in-house synthesized and loaded sol-gel CW 20M SPE sorbent cartridges were characterized in terms of their extraction capability, breakthrough volume, retention volume, hold-up volume, number of the theoretical plate, and the retention factor.

scholarly journals Novel MIPs-Parabens based SPE Stationary Phases Characterization and Application

Molecules ◽  
2019 ◽  
Vol 24 (18) ◽  
pp. 3334 ◽  
Author(s):  
Angela Tartaglia ◽  
Abuzar Kabir ◽  
Songul Ulusoy ◽  
Halil Ibrahim Ulusoy ◽  
Giuseppe Maria Merone ◽  
...  
Keyword(s):  
Solid Phase ◽  
Stationary Phases ◽  
Retention Volume ◽  
Sol Gel ◽  
Retention Factor ◽  
Array Detector ◽  
Breakthrough Volume ◽  
Volume Number ◽  
Imprinted Polymers ◽  
Photodiode Array Detector

In this work, the synthesis, characterization, and application of novel parabens imprinted polymers as highly selective solid-phase extraction (SPE) sorbents have been reported. The imprinted polymers were created using sol–gel molecular imprinting process. All the seven parabens were considered herein in order to check the phase selectivity. By means of a validated HPLC-photodiode array detector (PDA) method all seven parabens were resolved in a single chromatographic run of 25 min. These SPE sorbents, in-house packed in SPE empty cartridges, were first characterized in terms of extraction capability, breakthrough volume, retention volume, hold-up volume, number of theoretical plates, and retention factor. Finally, the device was applied to a real urine sample to check the method feasibility on a very complex matrix. The new paraben imprinted SPE sorbents, not yet present in the literature, potentially encourage the development of novel molecularly imprinted polymers (MIPs) to enhance the extraction efficiency, and consequently the overall analytical performances, when the trace quantification is required.

Catalytic activity of Co-åkermanite and Co-pyroxene in oxidation reactions

2011 ◽  
Vol 89 (8) ◽  
pp. 939-947 ◽  
Author(s):  
Irena Mihailova ◽  
Dimitar Mehandjiev
Keyword(s):  
Catalytic Activity ◽  
Solid Phase ◽  
Sol Gel ◽  
Cobalt Content ◽  
Octahedral Coordination ◽  
Tetrahedral Coordination ◽  
Oxidation Reactions ◽  
Oxidation Of Co ◽  
Phase Synthesis ◽  
Catalytically Active

Two calcium–cobalt silicates were synthesized in which cobalt occupies different structural positions. The crystal phases belong to two main structural silicate types. In the Co-åkermanite structure (Ca2CoSi2O7), cobalt cations take tetrahedral coordination toward oxygen atoms. In the Co-pyroxene structure of CaCoSi2O6, cobalt displays octahedral coordination. Ca2CoSi2O7 was prepared by solid-phase synthesis and CaCoSi2O6 was prepared by sol–gel method. The synthesis of the phases was confirmed by XRD, FTIR, and EPR data. On the basis of the XPS analysis, it can be concluded that Co2+ cations exist in the studied silicates. Thus, it is possible to study the catalytic activity of two silicate phases containing Co2+ cations in different coordinations: tetrahedral and octahedral. It was found that cobalt silicates with crystal structures corresponding to pyroxene and åkermanite possess catalytic activity in the reactions of complete oxidation of CO and toluene. Co-pyroxene exhibits higher catalytic activity than Co-åkermanite, but the higher cobalt content on the surface of Co-pyroxene should also be taken into account. Then, it turns out that catalytically active complexes with Со2+ ions in tetrahedral coordination are more efficient than those with such ions in octahedral coordination when equal concentrations of cobalt were used on the surface of the catalysts.

scholarly journals Molecularly imprinted sol-gel silica for solid phase extraction of phenobarbital

2008 ◽  
Vol 19 (6) ◽  
pp. 1136-1143 ◽  
Author(s):  
Eduardo J. Pilau ◽  
Raquel G. C. Silva ◽  
Isabel C. F. S. Jardim ◽  
Fabio Augusto
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Sol Gel ◽  
Phase Extraction ◽  
Molecularly Imprinted

Hydroxyfullerene as a novel coating for solid-phase microextraction fiber with sol–gel technology

2002 ◽  
Vol 978 (1-2) ◽  
pp. 37-48 ◽  
Author(s):  
Jianxin Yu ◽  
Li Dong ◽  
Caiying Wu ◽  
Lin Wu ◽  
Jun Xing
Keyword(s):  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Sol Gel

Preparation and characterization of a novel nanocomposite coating based on sol-gel titania/hydroxyapatite for solid-phase microextraction

2019 ◽  
Vol 145 ◽  
pp. 942-950 ◽  
Author(s):  
Fereidoon Rahmani ◽  
Ali Es-haghi ◽  
Mohammad-Reza Milani Hosseini ◽  
Afsaneh Mollahosseini
Keyword(s):  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Sol Gel ◽  
Nanocomposite Coating

scholarly journals Synthesis and Characterization of Highly Efficient Oil-Water Separation, Recyclable, Magnetic Particles CoFe2O4/SDB

2021 ◽  
Author(s):  
Cailin Liu ◽  
Li Yu ◽  
Yue Fan ◽  
Chang Li ◽  
Xianyan Ren ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Magnetic Particles ◽  
In Situ Polymerization ◽  
Solid Phase ◽  
Sol Gel ◽  
Water Separation ◽  
Practical Applications ◽  
Oil Water Separation ◽  
Oil Water

Abstract In the oil-water separation, the difficulty to recover and low hydrophobicity are key limitation factors for practical applications. In this paper, we design Cobalt ferrite hybird Polystyrene divinylbenzene microspheres (CoFe2O4/SDB), which were conducted through in-situ suspension copolymerization. The CoFe2O4 is prepared by low heat solid phase sol-gel method. It had been found that the CoFe2O4/SDB have a spherical structure, good adsorption behavior, highly hydrophobicity and even superhydrophobicity. The adsorption capacity of CoFe2O4/SDB composites could absorb kerosene up to 6 times of its own weight. Interestingly, kerosene can be easily separated from the surface of CoFe2O4/SDB particles with ultrasonic operation. CoFe2O4/SDB particles can still maintain good hydrophobicity and adsorption capacity of kerosene after 11 cycles after drying. With in situ polymerization of St、DVB and CoFe2O4, CoFe2O4/SDB as a promising absorbent of kerosene which has great potential in application of oil-water separation.

Metal organic framework MIL-101 coated fiber for headspace solid phase microextraction of volatile aromatic compounds

2015 ◽  
Vol 7 (3) ◽  
pp. 918-923 ◽  
Author(s):  
Xiaohuan Zang ◽  
Guijiang Zhang ◽  
Qingyun Chang ◽  
Xi Zhang ◽  
Chun Wang ◽  
...  
Keyword(s):  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Steel Wire ◽  
Metal Organic Framework ◽  
Sol Gel ◽  
Metal Organic Frameworks ◽  
Coating Method ◽  
Metal Organic ◽  
Gel Technique ◽  
Volatile Aromatic Compounds

The sol–gel technique was applied as a novel coating method in the preparation of metal organic frameworks (MOFs)-based solid phase microextraction (SPME) fibers by coating MIL-101 onto a stainless steel wire.

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