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Magnetic nanoparticle

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https://www.readbyqxmd.com/read/28088081/lead-pb-2-and-copper-cu-2-remediation-from-water-using-superparamagnetic-maghemite-%C3%AE-fe2o3-nanoparticles-synthesized-by-flame-spray-pyrolysis-fsp
#1
Shalini Rajput, Lok P Singh, Charles U Pittman, Dinesh Mohan
Superparamagnetic maghemite (γ-Fe2O3) nanoparticles of controllable morphology were successfully synthesized using a flame spray pyrolysis (FSP) technique. Their physico-chemical properties, size, morphology, and surface chemistries were determined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), selected area electron diffraction patterns (SAED), SEM-EDX, scanning electron microscopy (SEM), and pHZPC(6.3). Elemental contents before and after adsorption were identified using energy dispersive X-ray fluorescence (ED-XRF), energy dispersive X-ray analysis (EDX) and elemental mapping...
November 27, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088078/genetically-tailored-magnetosomes-used-as-mri-probe-for-molecular-imaging-of-brain-tumor
#2
M Boucher, F Geffroy, S Prévéral, L Bellanger, E Selingue, G Adryanczyk-Perrier, M Péan, C T Lefèvre, D Pignol, N Ginet, S Mériaux
We investigate here the potential of single step production of genetically engineered magnetosomes, bacterial biogenic iron-oxide nanoparticles embedded in a lipid vesicle, as a new tailorable magnetic resonance molecular imaging probe. We demonstrate in vitro the specific binding and the significant internalization into U87 cells of magnetosomes decorated with RGD peptide. After injection at the tail vein of glioblastoma-bearing mice, we evidence in the first 2 h the rapid accumulation of both unlabeled and functionalized magnetosomes inside the tumor by Enhanced Permeability and Retention effects...
December 19, 2016: Biomaterials
https://www.readbyqxmd.com/read/28087449/highly-biocompatible-chitosan-with-super-paramagnetic-calcium-ferrite-cafe2o4-nanoparticle-for-the-release-of-ampicillin
#3
Ram Bilas, K Sriram, P Uma Maheswari, K M Meera Sheriffa Begum
The CaFe2O4 nanoparticles (CFNP) were synthesized using the solution combustion method. The CFNP-chitosan-ampicillin was prepared by the ionic gelation method using tripolyphosphate (TPP). The CFNP, chitosan-CFNP, chitosan-CFNP-ampicillin materials were characterized by XRD, FT-IR and TGA analysis in order to evaluate the particle nature and size, the presence of functional groups and their thermal stability. The FESEM and EDAX analysis were performed to understand the surface morphology of the materials and the presence of CFNP in the material, respectively...
January 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28087384/epidermal-growth-factor-egf-fragment-guided-anticancer-theranostic-particles-for-ph-responsive-release-of-doxorubicin
#4
Myun Koo Kang, Wei Mao, Jun Bae Lee, Hyuk Sang Yoo
An EGF fragment and doxorubicin were chemically co-decorated on single magnetic nanoparticles for concomitant cancer targeting and treatment. Magnetic nanoparticles (MNPs) were prepared by the precipitation of ferric chloride hydrates in an ammonia solution and subsequent surface-functionalization with amines. The terminal thiol group of the EGF fragment (EGFfr) was first conjugated to surface amines of the MNPs using a heterofunctional crosslinker, and doxorubicin was sequentially conjugated to the MNPs via a hydrazone linker, where the degree of substation of the surface amines to EGF was varied from 1% to 40%...
January 10, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28081462/in%C3%A2-vitro-evaluation-of-biodegradable-lignin-based-nanoparticles-for-drug-delivery-and-enhanced-antiproliferation-effect-in-cancer-cells
#5
Patrícia Figueiredo, Kalle Lintinen, Alexandros Kiriazis, Ville Hynninen, Zehua Liu, Tomás Bauleth-Ramos, Antti Rahikkala, Alexandra Correia, Tomáš Kohout, Bruno Sarmento, Jari Yli-Kauhaluoma, Jouni Hirvonen, Olli Ikkala, Mauri A Kostiainen, Hélder A Santos
Currently, nanosystems have been developed and applied as promising vehicles for different biomedical applications. We have developed three lignin nanoparticles (LNPs): pure lignin nanoparticles (pLNPs), iron(III)-complexed lignin nanoparticles (Fe-LNPs), and Fe3O4-infused lignin nanoparticles (Fe3O4-LNPs) with round shape, narrow size distribution, reduced polydispersity and good stability at pH 7.4. The LNPs showed low cytotoxicity in all the tested cell lines and hemolytic rates below 12% after 12 h of incubation...
January 2, 2017: Biomaterials
https://www.readbyqxmd.com/read/28081257/influence-of-la3-substitution-on-structure-morphology-and-magnetic-properties-of-nanocrystalline-ni-zn-ferrite
#6
Y K Dasan, B H Guan, M H Zahari, L K Chuan
Lanthanum substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5LaxFe1-xO4; 0.00 ≤x≤ 1.00) synthesized by sol-gel method were presented. X-ray diffraction patterns reveal the typical single phase spinel cubic ferrite structure, with the traces of secondary phase for lanthanum substituted nanocrystals. In addition, the structural analysis also demonstrates that the average crystallite size varied in the range of 21-25 nm. FTIR spectra present the two prominent absorption bands in the range of 400 to 600 cm-1 which are the fingerprint region of all ferrites...
2017: PloS One
https://www.readbyqxmd.com/read/28081239/statistical-modeling-applied-to-deformation-relaxation-processes-in-a-composite-biopolymer-network-induced-by-magnetic-field
#7
Javier Tarrío-Saavedra, Cécilia Galindo González, Salvador Naya, Jorge López-Beceiro, Alain Ponton
This study investigated a methodology based on image processing and statistics to characterize and model the deformation upon controlled and uniform magnetic field and the relaxation under zero field of droplets observed in aqueous solutions of sodium alginate incorporating magnetic maghemite nanoparticles stabilized by adsorption of citrate ions. The changes of droplet geometry were statistically analyzed using a new approach based on the data obtained from optical microscopy, image processing, nonlinear regression, evolutionary optimization, analysis of variance and resampling...
2017: PloS One
https://www.readbyqxmd.com/read/28079975/edge-states-and-topological-phase-transitions-in-chains-of-dielectric-nanoparticles
#8
Sergey Kruk, Alexey Slobozhanyuk, Denitza Denkova, Alexander Poddubny, Ivan Kravchenko, Andrey Miroshnichenko, Dragomir Neshev, Yuri Kivshar
Recently introduced field of topological photonics aims to explore the concepts of topological insulators for novel phenomena in optics. Here polymeric chains of subwavelength silicon nanodisks are studied and it is demonstrated that these chains can support two types of topological edge modes based on magnetic and electric Mie resonances, and their topological properties are fully dictated by the spatial arrangement of the nanoparticles in the chain. It is observed experimentally and described how theoretically topological phase transitions at the nanoscale define a change from trivial to nontrivial topological states when the edge mode is excited...
January 12, 2017: Small
https://www.readbyqxmd.com/read/28079364/dna-modified-fe3o4-au-magnetic-nanoparticles-as-selective-probes-for-simultaneous-detection-of-heavy-metal-ions
#9
Peng Miao, Yuguo Tang, Lei Wang
Driven by the urgent need to detect trace heavy metal ions in various real water samples, this article demonstrates for the first time an electrochemical biosensor based on DNA modified Fe3O4@Au magnetic nanoparticles (NPs). Three DNA probes are designed to contain certain mismatched base pairs. One is thiolated and modified on the surface of Fe3O4@Au NPs (DNA 1). The other two probes (DNA 2 and 3) are labeled with two independent electrochemical species. Stable structures of cytosine-Ag+-cytosine and thymine-Hg2+-thymine formed in the presence of Ag+ and Hg2+ can assist the hybridization of DNA 1/DNA 2 and DNA 1/DNA 3, which locate corresponding electrochemical species onto the surface of the magnetic NPs...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28079221/sizing-and-eddy-currents-in-magnetic-core-nanoparticles-an-optical-extinction-approach
#10
Luis J Mendoza Herrera, Ignacio J Bruvera, Lucía B Scaffardi, Daniel C Schinca
Optical extinction is a handy and ubiquitous technique that allows us to study colloidal nanoparticles in their native state. The typical analysis of the extinction spectrum can be extended in order to obtain structural information of the sample such as the size distribution of the cores and the thickness of the coating layers. In this work the extinction spectra of Fe3O4, Fe3O4@Au, and Fe3O4@SiO2@Au single and multilayer nanoparticles are obtained by solving full Mie theory with a frequency dependent susceptibility derived from the Gilbert equation and considering the effect of Eddy currents...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28079205/reversible-control-of-solubility-using-functionalized-nanoparticles
#11
Samir A Kulkarni, Allan S Myerson
The paper provides a novel method for the reversible control of solubility by use of functionalized nanoparticles. The nanoparticles are functionalized with functional groups that can act as a co-solvent or anti-solvent and thus can induce either dissolution or crystallization. The process is reversible, as the solution will go back to its original state when the nanoparticles are removed. The use of magnetic nanoparticles facilitates this reversibility. Reductions in solubility (and thus crystallization) were demonstrated for d-mannitol-water, sodium chloride-water and fenofibrate-ethyl acetate systems...
January 12, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28078950/magnetic-nanoparticles-based-drug-and-gene-delivery-systems-for-the-treatment-of-pulmonary-diseases
#12
Ibrahim M El-Sherbiny, Nancy M Elbaz, Mohammed Sedki, Abdulaziz Elgammal, Magdi H Yacoub
Magnetic nanoparticles (MNPs) have gained much attention due to their unique properties such as biocompatibility and biodegradability as well as magnetic and heat-medicated characteristics. Due to these inherent properties, MNPs have been widely used in various biomedical applications including targeted drug delivery and hyperthermia-based therapy. Hyperthermia is a promising approach for the thermal activation therapy of several diseases, including pulmonary diseases. Additionally, due to their large loading capacity and controlled release ability, several MNP-based drug delivery systems have been emerged for treatment of cystic fibrosis and lung cancer...
January 12, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28078913/silibinin-loaded-magnetic-nanoparticles-inhibit-htert-gene-expression-and-proliferation-of-lung-cancer-cells
#13
Soumaye Amirsaadat, Younes Pilehvar-Soltanahmadi, Faraz Zarghami, Shahriar Alipour, Zohreh Ebrahimnezhad, Nosratollah Zarghami
Nanoparticle-based targeted drug delivery has the potential for rendering silibinin specifically at the favorite site using an external magnetic field. Also, it can circumvent the pitfalls of poor solubility. For this purpose, silibinin-loaded magnetic nanoparticles are fabricated, characterized and evaluated cytotoxicity and hTERT gene expression in A549 lung cancer cell line. silibinin-loaded PLGA-PEG-Fe3O4 had dose- and time-dependent cytotoxicity than pure silibinin. Additionally, hTERT expression is more efficiently reduced with increasing concentrations of nanosilibinin than pure silibinin...
January 12, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28078889/quantification-of-free-polyelectrolytes-present-in-colloidal-suspension-revealing-a-source-of-toxic-responses-for-polyelectrolyte-wrapped-gold-nanoparticles
#14
Tian A Qiu, Marco D Torelli, Ariane M Vartanian, Nathan B Rackstraw, Joseph T Buchman, Lisa M Jacob, Catherine J Murphy, Robert J Hamers, Christy L Haynes
Polyelectrolyte (PE) wrapping of colloidal nanoparticles (NPs) is a standard method to control NP surface chemistry and charge. Because excess polyelectrolytes are usually employed in the surface modification process, it is critical to evaluate different purification strategies to obtain a clean final product and thus avoid ambiguities in the source of effects on biological systems. In this work, 4 nm diameter gold nanoparticles (AuNPs) were wrapped with 15 kDa poly(allylamine hydrochloride) (PAH), and three purification strategies were applied: (a) diafiltration or either (b) one round or (c) two rounds of centrifugation...
January 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28077264/self-assembly-of-green-tea-catechin-derivatives-in-nanoparticles-for-oral-lycopene-delivery
#15
Weikun Li, Murat Yalcin, Qishan Lin, Mohammed-Salleh M Ardawi, Shaker A Mousa
Lycopene is a natural anti-oxidant that has attracted much attention due to its varied applications such as protection against loss of bone mass, chronic diseases, skin cancer, prostate cancer, and cardiovascular disease. However, high instability and extremely low oral bioavailability limits its further clinical development. We selected a green tea catechin derivative, oligomerized (-)-epigallocatechin-3-O-gallate (OEGCG) as a carrier for oral lycopene delivery. Lycopene-loaded OEGCG nanoparticles (NPs) were prepared by a nano-precipitation method, followed by coating with chitosan to form a shell...
January 7, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28075557/facile-synthesis-of-magnetic-covalent-organic-framework-with-three-dimensional-bouquet-like-structure-for-enhanced-extraction-of-organic-targets
#16
Sijing He, Tao Zeng, Saihua Wang, Hongyun Niu, Yaqi Cai
A facile strategy for the fabrication of novel bouquet-shaped magnetic porous nanocomposite via grafting a covalent organic framework (COF, TpPa-1) onto the surface-modified Fe3O4 nanoparticles (Fe3O4 NPs) was reported. The magnetic TpPa-1 (a COF synthesized from 1,3,5-triformylphloroglucinol (Tp) and p-phenylenediamine (Pa-1)) contains clusters of core-shell magnetic nanoparticles and interconnected porous TpPa-1 nanofibers. Thus, it possesses larger specific surface area, higher porosity, and supermagnetism, making it an ideal sorbent for enrichment of trace analytes...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28074208/optomagnetic-detection-of-dna-triplex-nanoswitches
#17
Gabriel Antonio S Minero, Jeppe Fock, John S McCaskill, Mikkel F Hansen
We report on optomagnetic dose-dependent detection of DNA triplex-mediated and pH-switchable clusters of functionalised magnetic nanoparticles.
January 11, 2017: Analyst
https://www.readbyqxmd.com/read/28072579/development-of-advanced-signal-processing-and-source-imaging-methods-for-superparamagnetic-relaxometry
#18
Ming-Xiong Huang, Bill Anderson, Charles W Huang, Gerd J Kunde, Erika C Vreeland, Jeffrey W Huang, Andrei N Matlashov, Todor Karaulanov, Christopher P Nettles, Andrew Gomez, Kayla Minser, Caroline Weldon, Giulio Paciotti, Michael Harsh, Roland R Lee, Edward R Flynn
Superparamagnetic relaxometry (SPMR) is a highly sensitive technique for the in vivo detection of tumor cells and may improve early stage detection of cancers. SPMR employs superparamagnetic iron oxide nanoparticles (SPION). After a brief magnetizing pulse is used to align the SPION, SPMR measures the time decay of SPION using super-conducting quantum interference device (SQUID) sensors. Substantial research has been carried out in developing the SQUID hardware and in improving the properties of the SPION. However, little research has been done in the pre-processing of sensor signals and post-processing source modeling in SPMR...
January 10, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28072576/ultrasonic-computed-tomography-imaging-of-iron-oxide-nanoparticles
#19
Or Perlman, Haim Azhari
Iron oxide nanoparticles (IONPs) are becoming increasingly used and intensively investigated in the field of medical imaging. They are currently FDA approved for magnetic resonance imaging (MRI), and it would be highly desirable to visualize them by ultrasound as well. Previous reports using the conventional ultrasound B-scan (pulse-echo) imaging technique have shown very limited detectability of these particles. The aim of this study is to explore the feasibility of imaging IONPs using the through-transmission ultrasound methodology and demonstrate their detectability using ultrasonic computed tomography (UCT)...
January 10, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28072433/effects-of-superparamagnetic-nanoparticles-on-nucleation-and-crystal-growth-in-the-vitrified-vs55-during-warming
#20
Y Xu, H M Yu, Y Q Niu, S C Luo, X Cheng
:   BACKGROUND:Magnetic nanoparticles (mNPs), once excited by radiofrequency (RF) energy, could heat uniformly and rapidly the vitrified biospecimens. However, there are few studies about the impact of mNPs on crystallization kinetics of vitrified samples. OBJECTIVES: The present work aims to investigate the nucleation and crystal growth in the vitrification solution VS55 with mNPs. MATERIALS AND METHODS: Ferrotec EMG308 superparamagnetic nanoparticles (10 ± 2...
November 2016: Cryo Letters
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