l-Proline-modified magnetic nanoparticles (LPMNP): a novel magnetically separable organocatalyst

RSC Advances ◽  
2014 ◽  
Vol 4 (43) ◽  
pp. 22497 ◽  
Author(s):  
Ali Khalafi-Nezhad ◽  
Maryam Nourisefat ◽  
Farhad Panahi
Keyword(s):  
Magnetic Nanoparticles ◽  
Magnetically Separable ◽  
Modified Magnetic Nanoparticles

Application of highly efficient and reusable H3PW12O40/Fe3O4@SiO2-Pr-Pi nanocatalyst for preparation of dihydro-2-oxypyrrole derivatives

2021 ◽  
Vol 99 (1) ◽  
pp. 72-78
Author(s):  
Shiva Zafari ◽  
Ramin Ghorbani-Vaghei ◽  
Sedigheh Alavinia
Keyword(s):  
Magnetic Nanoparticles ◽  
Ftir Spectroscopy ◽  
Heterogeneous Catalyst ◽  
Environmentally Friendly ◽  
Dimethyl Acetylenedicarboxylate ◽  
Nanostructured Catalyst ◽  
Reaction Conditions ◽  
Highly Efficient ◽  
Magnetically Separable ◽  
Modified Magnetic Nanoparticles

In this study, a novel heterogeneous catalyst (H3PW12O40/Fe3O4@SiO2-Pr-Pi) was prepared via immobilization of H3PW12O40 on the surface of piperidine modified magnetic nanoparticles (Fe3O4@SiO2-Pr-Pi). The synthesis of dihydro-2-oxypyrrole derivatives was carried out by the reaction of substituted aniline, formaldehyde, and dimethyl acetylenedicarboxylate, promoted by H3PW12O40/Fe3O4@SiO2-Pr-Pi in EtOH. The formation of resultant catalyst was confirmed by FTIR spectroscopy, FE-SEM, EDX, VSM, and TGA techniques. The magnetically separable and environmentally friendly nanostructured catalyst remained quite stable during reaction conditions and was reused for at least five recycle runs.

Mo(vi) complex supported on Fe3O4 nanoparticles: magnetically separable nanocatalysts for selective oxidation of sulfides to sulfoxides

RSC Advances ◽  
2015 ◽  
Vol 5 (66) ◽  
pp. 53349-53356 ◽  
Author(s):  
Hasan Keypour ◽  
Masomeh Balali ◽  
Mohammad Mehdi Haghdoost ◽  
Mojtaba Bagherzadeh
Keyword(s):  
Schiff Base ◽  
Catalytic Activity ◽  
Magnetic Nanoparticles ◽  
Catalytic Oxidation ◽  
Fe3o4 Nanoparticles ◽  
Molybdenum Complex ◽  
Covalent Linkage ◽  
Oxidation Of Sulfides ◽  
Magnetically Separable ◽  
Modified Magnetic Nanoparticles

A molybdenum complex was immobilized on amino propyl and Schiff base modified magnetic nanoparticles by covalent linkage. In catalytic oxidation of sulfides, the catalysts showed similar catalytic activity but different stability and recyclability.

scholarly journals Polymer Brush-Modified Magnetic Nanoparticles for His-Tagged Protein Purification

Langmuir ◽  
2011 ◽  
Vol 27 (6) ◽  
pp. 3106-3112 ◽  
Author(s):  
Fei Xu ◽  
James H. Geiger ◽  
Gregory L. Baker ◽  
Merlin L. Bruening
Keyword(s):  
Magnetic Nanoparticles ◽  
Protein Purification ◽  
Polymer Brush ◽  
Modified Magnetic Nanoparticles

Nanoparticle supported, magnetically separable manganese porphyrin as an efficient retrievable nanocatalyst in hydrocarbon oxidation reactions

RSC Advances ◽  
2016 ◽  
Vol 6 (47) ◽  
pp. 41551-41560 ◽  
Author(s):  
Mojtaba Bagherzadeh ◽  
Anahita Mortazavi-Manesh
Keyword(s):  
Magnetic Nanoparticles ◽  
Hydrocarbon Oxidation ◽  
Oxidation Reactions ◽  
Manganese Porphyrin ◽  
Functionalized Magnetic Nanoparticles ◽  
Magnetically Separable

Magnetically separable manganese porphyrin was prepared by immobilizing on functionalized magnetic nanoparticles via the amino propyl linkage and used as an efficient retrievable nanocatalyst in hydrocarbon oxidation reactions.

scholarly journals Selective Capture and Identification of Methicillin-Resistant Staphylococcus aureus by Combining Aptamer-Modified Magnetic Nanoparticles and Mass Spectrometry

2021 ◽  
Vol 22 (12) ◽  
pp. 6571
Author(s):  
Yu-Chen Liu ◽  
Katragunta Kumar ◽  
Cheng-Hsiu Wu ◽  
Kai-Chih Chang ◽  
Cheng-Kang Chiang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Staphylococcus Aureus ◽  
Magnetic Nanoparticles ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Capture Rate ◽  
Mass Spectrometry Analysis ◽  
Ionization Mass ◽  
Methicillin Resistant ◽  
Spectrometry Analysis ◽  
Modified Magnetic Nanoparticles

A nucleic acid aptamer that specifically recognizes methicillin-resistant Staphylococcus aureus (MRSA) has been immobilized on magnetic nanoparticles to capture the target bacteria prior to mass spectrometry analysis. After the MRSA species were captured, they were further eluted from the nanoparticles and identified using matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS). The combination of aptamer-based capture/enrichment and MS analysis of microorganisms took advantage of the selectivity of both techniques and should enhance the accuracy of MRSA identification. The capture and elution efficiencies for MRSA were optimized by examining factors such as incubation time, temperature, and elution solvents. The aptamer-modified magnetic nanoparticles showed a capture rate of more than 90% under the optimized condition, whereas the capture rates were less than 11% for non-target bacteria. The as-prepared nanoparticles exhibited only a 5% decrease in the capture rate and a 9% decrease in the elution rate after 10 successive cycles of utilization. Most importantly, the aptamer-modified nanoparticles revealed an excellent selectivity towards MRSA in bacterial mixtures. The capture of MRSA at a concentration of 102 CFU/mL remained at a good percentage of 82% even when the other two species were at 104 times higher concentration (106 CFU/mL). Further, the eluted MRSA bacteria were successfully identified using MALDI mass spectrometry.

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