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iron preparation

N Fahrenfeld, A Pruden, M Widdowson
Methyl ethyl ketone (MEK) is a common groundwater contaminant often present with more toxic compounds of primary interest. Because of this, few studies have been performed to determine the effect of microbial community structure on MEK biodegradation rates in aquifer sediments. Here, microcosms were prepared with aquifer sediments containing MEK following a massive spill event and compared to laboratory-spiked sediments, with MEK biodegradation rates quantified under mixed aerobic/anaerobic conditions. Biodegradation was achieved in MEK-contaminated site sediment microcosms at about half of the solubility (356 mg/L) with largely Firmicutes population under iron-reducing conditions...
October 20, 2016: Biodegradation
Zhuang Li, Ling Liu, Hong-Mei Sun, Qi Shen, Yong Zhang
A novel family of ionic iron(ii) complexes of the general formula [HL][Fe(PR'3)X3] (HL = 1,3-bis(2,6-diisopropylphenyl)imidazolium cation, HIPr, R' = Ph, X = Cl, 2; HL = HIPr, R' = Cy, X = Cl, 3; HL = HIPr, R' = Ph, X = Br, 4; HL = HIPr, R' = Cy, X = Br, 5; HL = 1,3-bis(2,4,6-trimethylphenyl)imidazolium cation, HIMes, R' = Cy, X = Br, 6) was easily prepared via a stepwise approach in 88%-92% yields. In addition, an ionic iron(ii) complex, [HIPr][Fe(C4H8O)Cl3] (1), has been isolated from the reaction of FeCl2(THF)1...
October 21, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Marzieh Zargaran, Ebrahim Saadat, Rassoul Dinarvand, Mohammad Sharifzadeh, Farid Dorkoosh
Purpose: One of the most nutritional disorders around the world is iron deficiency. A novel iron compound was synthesized by chelating ferrous ions with alanine for prevention and treatment of iron deficiency anemia. Methods: The newly synthesized compound was characterized both qualitatively and quantitatively by Fourier Transform Infrared (FT-IR) spectroscopy. The bioavailability of newly synthesized iron micronutrient was evaluated in four groups of Wistar rats. The group I was a negative control group and the other three groups received three different iron formulations...
September 2016: Advanced Pharmaceutical Bulletin
Liejy Agnes Landim, Marcia Luiza Dos Santos Beserra Pessoa, Amanda de Castro Amorim Serpa Brandão, Marcelo Antonio Morgano, Marcos Antônio De Mota Araújo Marcos Antônio de Mota Araújo, Maurisrael De Moura Rocha, José Alfredo Gomes Arêas, Regilda Saraiva Dos Reis Moreira-Araújo
INTRODUCTION: Nutritional intervention in pre-school children using cookies prepared with wheat flour enriched with iron and folic acid (CWFFeFA) and cookies prepared with cowpea (Vigna unguiculata (L.) Walp) flour fortified with iron and zinc and wheat flour enriched with iron and folic acid (CCFFeZn + WFFeFA). OBJECTIVE: To assess the impact of the ingestion of CWFFeFA and CCFFeZn + WFFeFA by pre-school children, using the cowpea variety BRS-Xiquexique, to control iron-deficiency anaemia...
September 20, 2016: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
Maneea Eizadi Sharifabad, Tim Mercer, Tapas Sen
Liposome-capped core-shell mesoporous silica-coated superparamagnetic iron oxide nanoparticles called 'magnetic protocells' were prepared as novel nanocomposites and used for loading anticancer drug doxorubicin (DOX) for cellular toxicity study. Cytotoxicity of the magnetic protocells with or without DOX was tested in vitro on commercial MCF7 and U87 cell lines under alternating magnetic field. MCF7 cell line treated with the DOX-loaded nanoparticles under alternating magnetic field exhibited nearly 20% lower survival rate after 24 h compared with cells treated with free DOX and similarly, it was around 24% when applied to U87...
October 19, 2016: Nanomedicine
Inderbir Singh, Vikas Rana
BACKGROUND: The study was aimed to enhance the mucoadhesive potential of Eudragit RS 100 and RL 100 using iron oxide. METHODS: Microspheres of Eudragit RS/RL100, containing cinnarizine, were prepared by emulsification solvent evaporation technique employing 32 full factorial design. Eudragit RS or RL (X1) and iron oxide (X2) concentrations were the independent variables. Particle size, entrapment efficiency, mucoadhesion, zeta potential and t90% were the response variables...
October 18, 2016: Current Drug Delivery
Tamiris B Grimaldi, Guilherme Lutz, Davi F Back, Gilson Zeni
In this paper, we report our results on the cyclization of (biphenyl-2-alkyne) derivatives to give two different types of phenanthrene derivatives, 9-iodo-10-organochalcogen-phenanthrenes and 9-organochalcogen-phenanthrenes. The strategy for the synthesis was based on the use of electrophilic cyclization for the preparation of 9-iodo-10-organochalcogen-phenanthrenes and iron(iii) chloride/diorganyl diselenide-mediated intramolecular cyclization to prepare 9-organochalcogen-phenanthrenes. The effects of solvent, temperature, reaction time and stoichiometry on the efficiency of cyclization reactions were investigated...
October 18, 2016: Organic & Biomolecular Chemistry
Young Jin Sa, Dong-Jun Seo, Jinwoo Woo, Jung Tae Lim, Jae Yeong Cheon, Seung Yong Yang, Jae Myeong Lee, Dongwoo Kang, Tae Joo Shin, Hyeon Suk Shin, Hu Young Jeong, Chul Sung Kim, Min Gyu Kim, Tae-Young Kim, Sang Hoon Joo
Iron-nitrogen on carbon (Fe-N/C) catalysts have emerged as promising non-precious metal catalysts (NPMCs) for oxygen reduction reaction (ORR) in energy conversion and storage devices. It has been widely suggested that an active site structure for Fe-N/C catalysts contains Fe-Nx coordination. However, the preparation of high-performance Fe-N/C catalysts mostly involves a high-temperature pyrolysis step, which generates not only catalytically active Fe-Nx sites, but also less active large iron-based particles...
October 18, 2016: Journal of the American Chemical Society
Qing Zhang, Haoyu Zhao, Dong Li, Liping Liu, Shuhu Du
To achieve drug targeting and on-demand releasing, surface functionalization plays a critical role in fabricating potential mesoporous silica nanoparticles (MSNs) toward tumor chemotherapy. Here, we prepared a size-controllable ligand-functionalized MSNs delivery system via coordinate bonding, which can release doxorubicin (DOX) in response to pH and prolong the circulation time of drug in vivo. After modifying the external surface of MSNs with polyethylene glycol (PEG), iminodiacetic acid (IDA) as a ligand was mainly grafted on the surface of mesopores to chelate cupric iron and DOX in sequence via coordinate bonds...
October 11, 2016: Colloids and Surfaces. B, Biointerfaces
Teresa F Mastropietro, Nadia Marino, Giovanni De Munno, Francesc Lloret, Miguel Julve, Emilio Pardo, Donatella Armentano
The preparation and structural characterization of four novel oxalate-based iron(III) compounds of formulas {(MeNH3)2[Fe2(ox)2Cl4]·2.5H2O}n (1), K(MeNH3)[Fe(ox)Cl3(H2O)] (2), {MeNH3[Fe2(OH)(ox)2Cl2]·2H2O}n (3), and {(H3O)(MeNH3)[Fe2O(ox)2Cl2]·3H2O}n (4) (MeNH3(+) = methylammonium cation and H2ox = oxalic acid) are reported here. 1 is an anionic waving chain of oxalato-bridged iron(III) ions with peripheral chloro ligands, the charge balance being ensured by methylammonium cations. 2 is a mononuclear complex with a bidentate oxalate, three terminal chloro ligands, and a coordinated water molecule achieving the six-coordination around each iron(III) ion...
October 17, 2016: Inorganic Chemistry
Amal Juma Habish, Slavica Lazarević, Ivona Janković-Častvan, Bojan Jokić, Janez Kovač, Jelena Rogan, Đorđe Janaćković, Rada Petrović
Natural (SEP) and partially acid-activated (AAS) sepiolites were used to prepare composites with nanoscale zerovalent iron (nZVI) at different (SEP or AAS)/nZVI ratios in order to achieve the best nZVI dispersibility and the highest adsorption capacity for Cd(2+). Despite the higher surface area and pore volume of AAS, better nZVI dispersibility was achieved by using SEP as the support. On the other hand, a lower oxidation degree was achieved during the synthesis using AAS. X-ray photoelectron spectroscopy (XPS) analysis of the composite with the best nZVI dispersibility, before and after Cd(2+) adsorption, confirmed that the surface of the nZVI was composed of oxidized iron species...
October 14, 2016: Environmental Science and Pollution Research International
Ditte B Hermund, Ayse Karadag, Ulf Andersen, Rósa Jónsdóttir, Hordur G Kristinsson, Cesarettin Alasalvar, Charlotte Jacobsen
Fucus vesiculosus extracts that have both radical scavenging activity and metal chelating ability in vitro were used as natural antioxidant in granola bars enriched with fish oil emulsion either by using primary and secondary emulsion systems stabilized by sodium caseinate alone and sodium caseinate-chitosan. The bars were stored at 20°C and evaluated over a period of 10 weeks by measuring the development of primary and secondary oxidation products. The samples prepared with secondary emulsion system developed less oxidation products probably due to increased interfacial layer thickness that would act a barrier to the penetration and diffusion of molecular species that promote oxidation...
October 14, 2016: Journal of Agricultural and Food Chemistry
Farah Benyettou, Jaen Alonso Ocadiz Flores, Florent Ravaux, Rachid Rezgui, Mustapha Jouiad, Samer I Nehme, Rajesh Kumar Parsapur, John-Carl Olsen, Parasuraman Selvam, Ali Trabolsi
Mesoporous iron-oxide nanoparticles (mNPs) were prepared by using a modified nanocasting approach with mesoporous carbon as a hard template. mNPs were first loaded with doxorubicin (Dox), an anticancer drug, and then coated with the thermosensitive polymer Pluronic F108 to prevent the leakage of Dox molecules from the pores that would otherwise occur under physiological conditions. The Dox-loaded, Pluronic F108-coated system (Dox@F108-mNPs) was stable at room temperature and physiological pH and released its Dox cargo slowly under acidic conditions or in a sudden burst with magnetic heating...
October 14, 2016: Chemistry: a European Journal
Xuefei Tu, Apichaya Aneksampant, Shizusa Kobayashi, Atsushi Tanaka, Ryo Nishimoto, Masami Fukushima
It had been reported that iron and manganese oxides in steel slag enhanced the production of humic acid (HA) from low-molecular-weight compounds, such as phenolic acids, amino acids, and saccharides. In the present study, this function of steel slag was applied to the composting of raw organic wastes (ROWs). The degree of humification of HAs is an important factor in evaluating compost quality. Thus, HAs were extracted from the prepared composts and the humification parameters were determined, in terms of elemental compositions, acidic functional group contents, molecular weights, spectroscopic parameters from UV-vis absorption and (13)C NMR spectra...
October 13, 2016: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
Cyril Bosset, Gauthier Lefebvre, Patrick Angibaud, Ian Stansfield, Lieven Meerpoel, Didier Berthelot, Amandine Guérinot, Janine Cossy
An iron-catalyzed synthesis of sulfur- and sulfone-containing heterocycles is reported. The method is based on the cyclization of readily available substrates and proceeded with high efficiency and diastereoselectivity. A variety of sulfur-containing heterocycles bearing moieties suitable for subsequent functionalization are prepared. Illustrative examples of such postcyclization modifications are also presented.
October 13, 2016: Journal of Organic Chemistry
Pinghua Ling, Jianping Lei, Huangxian Ju
In this work, we designed a nanoscaled porphyrinic metal-organic framework (PorMOF) with iron porphyrin as linker and zirconium ion as node for electrochemical detection of telomerase activity. The as-prepared PorMOF was characterized with scanning electron microscopy, powder X-ray diffraction and spectroscopic techniques, and demonstrated the excellent electrocatalytic activity towards O2 reduction. Sequentially, the functionalization of PorMOF with streptavidin results in water-stable electrochemical tracer for detection of telomerase...
October 11, 2016: Analytical Chemistry
Xiaojun Liu, Shouzhong Zou, Shaowei Chen
Doping with foreign atoms is an effective approach to significantly enhance the catalytic performance of carbon materials for oxygen reduction reaction (ORR). In this paper, a colloidal silica template method was employed to synthesize nitrogen and iron codoped ordered mesoporous carbon for ORR electrocatalysis. The carbon materials were thoroughly characterized by transmission electron microscopy, Raman spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy measurements. The porosity was quantified by nitrogen adsorption/desorption measurements that showed the formation of ordered mesoporous structures with a BET specific surface area up to 953...
October 11, 2016: Nanoscale
Takahiro Suzuki
Most patients with iron deficiency anemia are treated effectively with oral iron preparations. However, a small number of these patients are refractory to such treatments, even when the pathologic condition underlying the anemia is concurrently treated. The pathological basis for this refractoriness can be explained by several factors, including malabsorption of iron, e.g. atrophic gastritis, deficiency of other hematopoietic vitamins or minerals, e.g. vitamin B12 or zinc, other undiagnosed anemic disorders, e...
2016: [Rinshō Ketsueki] the Japanese Journal of Clinical Hematology
M Arshadi, M K Abdolmaleki, F Mousavinia, S Foroughifard, A Karimzadeh
This paper reports the preparation and stabilization of nano zero valent iron (NZVI) on a modified aquatic plant, Azolla filiculoides, and investigates its potential for the adsorption/reduction of Pb(II) and Hg(II) ions from aqueous media even after six months of storage in the lab condition. XRD, TEM and zeta potential results demonstrated that the Azolla-NaOH could be a good stabilizer of aged NZVI (six months) and the green support suppressed the oxidation and aggregation of immobilized NZVI. Kinetic and equilibrium models for lead and mercury ions uptake were developed by considering the effect of the initial Pb(II) and Hg(II) concentrations, contact time, adsorbent dosage, initial pH and effect of temperature...
October 4, 2016: Journal of Colloid and Interface Science
Sharif Najafishirtari, Tathiana Midori Kokumai, Sergio Marras, Priscila Destro, Mirko Prato, Alice Scarpellini, Rosaria Brescia, Aidin Lak, Teresa Pellegrino, Daniela Zanchet, Liberato Manna, Massimo Colombo
We report the colloidal synthesis of dumbbell-like Au0.5Cu0.5@Fe3O4 nanocrystals (AuCu@FeOx NCs) and the study of their properties in the CO oxidation reaction. To this aim, the as-prepared NCs were deposited on γ-alumina and pre-treated in an oxidizing environment to remove the organic ligands. A comparison of these NCs with bulk Fe3O4-supported AuCu NCs showed that the nanosized support was far more effective in preventing the sintering of the metal domains, leading thus to a superior catalytic activity...
October 10, 2016: ACS Applied Materials & Interfaces
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