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https://www.readbyqxmd.com/read/29050608/magnetic-nanohydrogel-obtained-by-miniemulsion-polymerization-of-poly-acrylic-acid-grafted-onto-derivatized-dextran
#1
Rodolfo Debone Piazza, Eloiza da Silva Nunes, Wesley Renato Viali, Sebastião William da Silva, Fermin Herrera Aragón, José Antônio Huamaní Coaquira, Paulo César de Morais, Rodrigo Fernando Costa Marques, Miguel Jafelicci
This study describes the synthesis of magnetic nanohydrogels by miniemulsion polymerization technique. Dextran was derivatized by the glycidyl methacrylate to anchor vinyl groups on polysaccharides backbone, allowing its use as a macromonomer for miniemulsion polymerization, as confirmed by proton nuclear magnetic resonance spectroscopy ((13)C NMR). Magnetite nanoparticles were synthesized by coprecipitation, followed by air oxidation to maghemite. The results of X-ray diffractometry (XRD), Raman and transmission electron microscopy (TEM) analysis showed that maghemite nanoparticles were obtained with a diameter of 5...
December 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29050574/superparamagnetic-ipn-gels-of-carrageenan-phema-excelling-in-shape-retention
#2
Takahiro Tsuru, Kazuki Sugimura, Yoshiyuki Nishio
Iron oxide nanoparticles-incorporated carrageenan (CAR)/PHEMA composites of interpenetrating network (IPN) type were successfully prepared by in situ ferrite synthesis in the polymer network. The IPN structure was constructed at CAR/PHEMA compositions of 15/85 and 40/60 (wt/wt) by polymerization and cross-linking of 2-hydroxyethylmethacrylate as an impregnating solvent of CAR gels. As a result of this IPN construction, the composites were firm and showed a good shape-retentivity in their gelatinous state. SQUID magnetometry and X-ray diffractometry were conducted for evaluation of the magnetic property of the inorganic-hybridized IPN composites...
December 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29049972/noble-metals-decorated-hierarchical-maghemite-magnetic-tubes-as-an-efficient-recyclable-catalyst
#3
Rahul Purbia, Santanu Paria
The noble metal nanocatalysts on high surface area magnetic material supports have huge technological importance in the field of catalysis. The green synthesis of magnetic-noble metal hybrid material has another technological importance. In this study, we report a novel, efficient, and sustainable synthesis methodology for Au nanoparticles (NPs) deposited hierarchical magnetic maghemite (γ-Fe2O3) tubes. In this methodology, the green tea extract was used as a reducing agent for both iron oxide and Au NPs synthesis...
October 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29046849/a-systematic-study-of-the-controlled-generation-of-crystalline-iron-oxide-nanoparticles-on-graphene-using-a-chemical-etching-process
#4
Peter Krauß, Jörg Engstler, Jörg J Schneider
Chemical vapor deposition (CVD) of carbon precursors employing a metal catalyst is a well-established method for synthesizing high-quality single-layer graphene. Yet the main challenge of the CVD process is the required transfer of a graphene layer from the substrate surface onto a chosen target substrate. This process is delicate and can severely degrade the quality of the transferred graphene. The protective polymer coatings typically used generate residues and contamination on the ultrathin graphene layer...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29039917/multifunctional-theranostic-nanoparticles-based-on-exceedingly-small-magnetic-iron-oxide-nanoparticles-for-t1-weighted-magnetic-resonance-imaging-and-chemotherapy
#5
Zheyu Shen, Tianxiang Chen, Xuehua Ma, Wenzhi Ren, Zijian Zhou, Guizhi Zhu, Ariel Zhang, Yijing Liu, Jibin Song, Zihou Li, Huimin Ruan, Wenpei Fan, Lisen Lin, Jeeva Munasinghe, Xiaoyuan Chen, Aiguo Wu
The recently emerged exceedingly small magnetic iron oxide nanoparticles (ES-MIONs) (<5 nm) are promising T1-weighted contrast agents for magnetic resonance imaging (MRI) due to their good biocompatibility compared with Gd-chelates. However, the best particle size of ES-MIONs for T1 imaging is still unknown because the synthesis of ES-MIONs with precise size control to clarify the relationship between the r1 (or r2/r1) and the particle size remains a challenge. In this study, we synthesized ES-MIONs with seven different sizes below 5 nm and found that 3...
October 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/29039101/methods-for-analysis-of-nanoparticle-immunosuppressive-properties-in-vitro-and-in-vivo
#6
Timothy M Potter, Barry W Neun, Marina A Dobrovolskaia
Adverse drug effects on the immune system function represent a significant concern in the pharmaceutical industry, because 10-20% of the drug withdrawal from the market is accounted to immunotoxicity. Immunosuppression is one such adverse effect. The traditional immune function test used to estimate materials' immunosuppression is a T-cell-dependent antibody response (TDAR). This method involves a 28 day in vivo study evaluating the animal's antibody titer to a known antigen (KLH) with and without challenge...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29038584/dual-drug-containing-core-shell-nanoparticles-for-lung-cancer-therapy
#7
Jyothi U Menon, Aneetta Kuriakose, Roshni Iyer, Elizabeth Hernandez, Leah Gandee, Shanrong Zhang, Masaya Takahashi, Zhang Zhang, Debabrata Saha, Kytai T Nguyen
Late-stage diagnosis of lung cancer occurs ~95% of the time due to late manifestation of its symptoms, necessitating rigorous treatment following diagnosis. Existing treatment methods are limited by lack of specificity, systemic toxicity, temporary remission, and radio-resistance in lung cancer cells. In this research, we have developed a folate receptor-targeting multifunctional dual drug-loaded nanoparticle (MDNP) containing a poly(N-isopropylacrylamide)-carboxymethyl chitosan shell and poly lactic-co-glycolic acid (PLGA) core for enhancing localized chemo-radiotherapy to effectively treat lung cancers...
October 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29036735/facile-synthesis-and-characterization-of-l-aspartic-acid-coated-iron-oxide-magnetic-nanoparticles-ionps-for-biomedical-applications
#8
Marziyeh Salehiabar, Hamed Nosrati, Soodabeh Davaran, Hossein Danafar, Hamidreza Kheiri Manjili
Natural L-aspartic acid coated iron oxide magnetic nanoparticles (Asp@IONPs) were prepared by a one pot, in-situ and green co-precipitation method in an aqueous medium. Functionalized iron oxide magnetic nanoparticles (IONPs) were characterized by Vibrating Sample Magnetometer (VSM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) techniques. Cellular toxicity of IONPs was also investigated on HEK-293 cell lines...
October 16, 2017: Drug Research
https://www.readbyqxmd.com/read/29035808/nh2-coordinately-immobilized-tris-8-quinolinolato-iron-onto-the-silica-coated-magnetite-nanoparticle-fe3o4-sio2-feq3-as-a-selective-fenton-like-catalyst-for-clean-oxidation-of-sulfides
#9
Sadegh Rostamnia, Behnam Gholipour, Xiao Liu, Yuan Wang, Hamidreza Arandiyan
A green, robust and eco-friendly procedure for the oxidation of aromatic organic sulfides to sulfones using H2O2 catalyzed by NH2-coordinately immobilized tris(8-quinolinolato)iron onto the silica coated magnetite (Fe3SiO6) has been developed. Physicochemical properties of the resulting nanoparticles were investigated by means of techniques including X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, vibrating sample magnetometer, atomic adsorption spectroscopy and FT-IR spectroscopy...
October 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29035747/studies-on-the-adsorption-and-desorption-of-mitoxantrone-to-lauric-acid-albumin-coated-iron-oxide-nanoparticles
#10
Jan Zaloga, Artem Feoktystov, Vasil M Garamus, Weronika Karawacka, Alexander Ioffe, Thomas Brückel, Rainer Tietze, Christoph Alexiou, Stefan Lyer
A rational use of superparamagnetic iron oxide nanoparticles (SPIONs) in drug delivery, diagnostics, and other biomedical applications requires deep understanding of the molecular drug adsorption/desorption mechanisms for proper design of new pharmaceutical formulations. The adsorption and desorption of the cytostatic Mitoxantrone (MTO) to lauric acid-albumin hybrid coated particles SPIONs (SEON(LA-HSA)) was studied by Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), surface titration, release experiments and small-angle neutron and X-ray scattering...
September 28, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29035540/targeted-clinical-nanoparticles-for-precision-cancer-therapy-based-on-disease-specific-molecular-inflection-points
#11
Charalambos Kaittanis, Alexander Bolaender, Barney Yoo, Nilesh Shah, Ouathek Ouerfelli, Jan Grimm
ional approaches based on clinical modular nanoplatforms are needed, in order to treat solid cancers according to their discrete molecular features. In the present study, we show that the clinical nanopharmaceutical Ferumoxytol, which consists of a glucose-based coat surrounding an iron oxide core, could identify molecular characteristics of prostate cancer, corresponding to unique phases of the disease continuum. By affixing a targeting probe for the prostate-specific membrane antigen on its surface, the nanopharmaceutical was able to assess the functional state of the androgen receptor pathway via MRI, guiding therapy and delivering it with the same clinical nanoparticle...
October 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/29035511/tuning-the-multifunctionality-of-iron-oxide-nanoparticles-using-self-assembled-mixed-lipid-layers
#12
Matthew Ryan Preiss, Eily Cournoyer, Karissa L Paquin, Elizabeth A Vuono, Kayla Belanger, Edward Walsh, Niall George Howlett, Geoffrey D Bothun
We present an approach to tune the multifunctionality of iron oxide nanoparticles (IONs) using mixed self-assembled monolayers of cationic lipid and anionic polyethylene glycol (PEG) lipid. By forming stable, monodispersed lipid coated IONs (L-IONs) through a solvent exchange technique, we were able to demonstrate the relationship between surface charge, the magnetic transverse relaxivity (r2 from T2 weighted images), and the binding capacity of small interfering ribonucleic acids (siRNAs) as a function of the cationic/anionic (PEG) lipid ratio...
October 16, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29035507/sequential-delivery-of-doxorubicin-and-zoledronic-acid-to-breast-cancer-cells-by-cb-7-modified-iron-oxide-nanoparticles
#13
Farah Benyettou, Marwa Alhashimi, Matthew O'Connor, Renu Pasricha, Jérémy Brandel, Hassan Trabousli, Javed Mazher, John-Carl Olsen, Ali Trabolsi
Drug-loaded magnetic nanoparticles were synthesized and used for the sequential delivery of the anti-resorptive agent zoledronic acid (Zol) and the cytotoxic drug doxorubicin (Dox) to breast cancer cells (MCF-7). Zol was attached to bare iron oxide nanoparticles (IONPs) via phosphonate coordination to form Z-NPs. The unbound imidazole of Zol was then used to complex the organic macrocycle CB[7] to obtain CZ-NPs. Dox was then complexed to the CZ-NPs to form the fully loaded particles (DCZ-NPs), which were stable in solution at 37 ºC and physiological pH (7...
October 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29033565/double-receptor-targeting-multifunctional-iron-oxide-nanoparticles-drug-delivery-system-for-the-treatment-and-imaging-of-prostate-cancer
#14
Md Shakir Uddin Ahmed, Ahmad Bin Salam, Clayton Yates, Kyle Willian, Jesse Jaynes, Timothy Turner, Mohamed O Abdalla
As an alternative therapeutic treatment to reduce or eliminate the current side effects associated with advanced prostate cancer (PCa) chemotherapy, a multifunctional double-receptor-targeting iron oxide nanoparticles (IONPs) (luteinizing hormone-releasing hormone receptor [LHRH-R] peptide- and urokinase-type plasminogen activator receptor [uPAR] peptide-targeted iron oxide nanoparticles, LHRH-AE105-IONPs) drug delivery system was developed. Two tumor-targeting peptides guided this double-receptor-targeting nanoscale drug delivery system...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29031960/the-effect-of-post-synthesis-aging-on-the-ligand-exchange-activity-of-iron-oxide-nanoparticles
#15
Kathleen Davis, Michael Vidmar, Airat Khasanov, Brian Cole, Melanie Ghelardini, Justin Mayer, Christopher Kitchens, Amar Nath, Brian A Powell, O Thompson Mefford
HYPOTHESIS: Ligand exchange is a widely-used method of controlling the surface chemistry of nanomaterials. Exchange is dependent on many factors including the age of the core particle being modified. Aging of the particles can impact surface structure and composition, which in turn can affect ligand binding. EXPERIMENTS: To quantify the effects of aging on ligand exchange, we employed a technique to track the exchange of radiolabeled (14)C-oleic acid with unlabeled, oleic acid bound to iron oxide nanoparticles...
September 23, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29031879/the-effects-of-extracellular-polymeric-substances-on-magnetic-iron-oxide-nanoparticles-stability-and-the-removal-of-microcystin-lr-in-aqueous-environments
#16
Yangyang Yang, Jun Hou, Peifang Wang, Chao Wang, Lingzhan Miao, Yanhui Ao, Xun Wang, Bowen Lv, Guoxiang You, Zhilin Liu, Yongxu Shao
The behaviors of nanoparticles rely on the aqueous condition such as natural organic matter (NOM). Therefore the presence of NOM would influence the interaction of nanoparticles with other substances possibly. Here, microcystin-LR (MC-LR) adsorption on iron oxide nanoparticles (IONPs) was studied in an aqueous solution with different types of NOM, including extracellular polymeric substances (EPS) from cyanobacteria and alginic acid sodium salt (AASS) from brown algae. Results revealed that EPS played an important role in stabilizing IONPs and in the toxin adsorption efficiency...
October 12, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29031797/impact-of-zero-valent-iron-nanoparticles-on-the-activity-of-anaerobic-granular-sludge-from-macroscopic-to-microcosmic-investigation
#17
Chuan-Shu He, Pan-Pan He, Hou-Yun Yang, Ling-Li Li, Yue Lin, Yang Mu, Han-Qing Yu
The study aimed at evaluating the influence of nano zero-valent iron (nZVI) on the activity of anaerobic granular sludge (AGS) from both macroscopic and microcosmic aspects using different methodologies. The tolerance response of AGS to nZVI was firstly investigated using short-term and long-term experiments, and also compared with anaerobic flocs. The Fe fate and distribution, the change of contents/structure of extracellular polymeric substances (EPS), and the variation of microbial community in the AGS after exposure to nZVI were further explored...
October 1, 2017: Water Research
https://www.readbyqxmd.com/read/29030222/vascular-changes-in-tumors-resistant-to-a-vascular-disrupting-nanoparticle-treatment
#18
Shweta Sharma, Aman P Mann, Tarmo Mölder, Venkata Ramana Kotamraju, Robert Mattrey, Tambet Teesalu, Erkki Ruoslahti
Anti-angiogenic and vascular disrupting therapies rely on the dependence of tumors on new blood vessels to sustain tumor growth. We previously reported a potent vascular disrupting agent, a theranostic nanosystem consisting of a tumor vasculature-homing peptide (CGKRK) fused to a pro-apoptotic peptide [D(KLAKLAK)2] coated on iron oxide nanoparticles. This nanosystem showed promising therapeutic efficacy in glioblastoma (GBM) and breast cancer models. However, complete control of the tumors was not achieved, and some tumors became non-responsive to the treatment...
October 13, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29029643/an-integrated-methodology-for-assessing-the-impact-of-food-matrix-and-gastrointestinal-effects-on-the-biokinetics-and-cellular-toxicity-of-ingested-engineered-nanomaterials
#19
Glen M DeLoid, Yanli Wang, Klara Kapronezai, Laura Rubio Lorente, Roujie Zhang, Georgios Pyrgiotakis, Nagarjun V Konduru, Maria Ericsson, Jason C White, Roberto De La Torre-Roche, Hang Xiao, David Julian McClements, Philip Demokritou
BACKGROUND: Engineered nanomaterials (ENMs) are increasingly added to foods to improve their quality, sensory appeal, safety and shelf-life. Human exposure to these ingested ENMs (iENMS) is inevitable, yet little is known of their hazards. To assess potential hazards, efficient in vitro methodologies are needed to evaluate particle biokinetics and toxicity. These methodologies must account for interactions and transformations of iENMs in foods (food matrix effect) and in the gastrointestinal tract (GIT) that are likely to determine nano-biointeractions...
October 13, 2017: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/29025673/effects-of-cetyltrimethylammonium-bromide-on-the-morphology-of-green-synthesized-fe3o4-nanoparticles-used-to-remove-phosphate
#20
Li Gan, Zeyang Lu, Dan Cao, Zuliang Chen
In this paper, iron oxide nanoparticles (IONPs) are successfully synthesized using Eucalyptus leaf extract in the presence of cetyltrimethylammonium bromide (CTAB) to enhance the dispersion and reduce aggregation of IONPs. CTAB was used as a stabilizing and capping agent in biosynthesis of IONP was observed. The particle size decreased from 183.9±30.1nm to 89.8±17.1nm as the concentration of CTAB increased from 0 to 0.4mM CTAB, indicating that CTAB reduce the aggregation of IONPs and enhance the reactivity...
January 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
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