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https://www.readbyqxmd.com/read/28941354/modulatory-effect-of-caffeic-acid-on-cholinesterases-inhibitory-properties-of-donepezil
#1
Odunayo Michael Agunloye, Ganiyu Oboh
Background Donepezil hydrochloride commonly used in the management of Alzheimer's disease (AD), exhibiting its inhibitory effects on acetylcholinesterase and butyrylcholinesterase activity thereby enhance cognitive function. Caffeic acid member of hydroxycinnamic acid is widely present in human diet. This study aims to investigate influence of caffeic acid on acetylcholinesterase and butyrylcholinesterase inhibitory properties of donepezil (in vitro). Methods 5 mg of donepezil was dissolved in 50 mL distilled water while 10 mg of caffeic acid was dissolved in 100 mL distilled water...
September 22, 2017: Journal of Complementary & Integrative Medicine
https://www.readbyqxmd.com/read/28938196/sorption-of-uranium-vi-onto-hydrous-ferric-oxide-modified-zeolite-assessment-of-the-effect-of-ph-contact-time-temperature-selected-cations-and-anions-on-sorbent-interactions
#2
Pfano Mathews Nekhunguni, Nikita Tawanda Tavengwa, Hlanganani Tutu
Zeolites are commonly used as adsorbents for metal removal in most applications e.g. in wastewater. However, the ubiquity of iron in such systems may, in the long-term, distort the true interactions and mechanisms of contaminant removal as a result of modification of the zeolite surface. In this study, this potential phenomenon was assessed for the removal of uranium(VI) from aqueous solution by hydrous ferric oxide-modified zeolite (HFOMZ). This was prepared by precipitating iron hydroxide (the common precipitate of iron in aqueous systems) onto zeolite...
September 19, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28938019/fabrication-of-3-methoxyphenol-sensor-based-on-fe3o4-decorated-carbon-nanotube-nanocomposites-for-environmental-safety-real-sample-analyses
#3
Mohammed M Rahman, Mohammad Musarraf Hussain, Abdullah M Asiri
Iron oxide ornamented carbon nanotube nanocomposites (Fe3O4.CNT NCs) were prepared by a wet-chemical process in basic means. The optical, morphological, and structural characterizations of Fe3O4.CNT NCs were performed using FTIR, UV/Vis., FESEM, TEM; XEDS, XPS, and XRD respectively. Flat GCE had been fabricated with a thin-layer of NCs using a coating binding agent. It was performed for the chemical sensor development by a dependable I-V technique. Among all interfering analytes, 3-methoxyphenol (3-MP) was selective towards the fabricated sensor...
2017: PloS One
https://www.readbyqxmd.com/read/28933864/cyanide-ligand-assembly-by-carbon-atom-transfer-to-an-iron-nitride
#4
Jorge L Martinez, Hsiu-Jung Lin, Wei-Tsung Lee, Maren Pink, Chun-Hsing Chen, Xinfeng Gao, Diane A Dickie, Jeremy M Smith
The new iron(IV) nitride complex PhB((i)Pr2Im)3Fe≡N reacts with two equivalents of bis(diisopropylamino)cyclopropenylidene (BAC) to provide PhB((i)Pr2Im)3Fe(CN)(N2)(BAC). This unusual example of a four-electron reaction involves carbon atom transfer from BAC to create a cyanide ligand along with the alkyne (i)Pr2N-C≡C-N(i)Pr2. The iron complex is in equilibrium with an N2-free species. Further reaction with CO leads to formation of a CO analogue, which can be independently prepared using NaCN as the cyanide source, while reaction with B(C6F5)3 provides the cyanoborane derivative...
September 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28930448/direct-observation-of-oxygen-rebound-with-an-iron-hydroxide-complex
#5
Jan Paulo T Zaragoza, Timothy H Yosca, Maxime A Siegler, Pierre Moënne-Loccoz, Michael T Green, David P Goldberg
The rebound mechanism for alkane hydroxylation was invoked over 40 years ago to help explain reactivity patterns in cytochrome P450, and subsequently has been used to provide insight into a range of biological and synthetic systems. Efforts to model the rebound reaction in a synthetic system have been unsuccessful, in part because of the challenge in preparing a suitable metal-hydroxide complex at the correct oxidation level. Herein we report the synthesis of such a complex. The reaction of this species with a series of substituted radicals allows for the direct interrogation of the rebound process, providing insight into this uniformly invoked, but previously unobserved process...
September 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28928514/component-analysis-of-nutritionally-rich-chloroplasts-recovery-from-conventional-and-unconventional-green-plant-species
#6
Mohamed A Gedi, Rhianna Briars, Felius Yuseli, Noorazwani Zainol, Randa Darwish, Andrew M Salter, David A Gray
A study of the literature indicates that chloroplasts synthesise a range of molecules, many of which have nutritional value for humans, but the nutritional credentials of chloroplasts recovered from plant cells are not established. Chloroplast-rich-fractions (CRFs) were prepared from green plant species and the macro- and micro-nutrient composition compared with the whole leaf materials (WLMs). The results indicated that, on a dry weight basis, CRF material from a range of green biomass was enriched in lipids and proteins, and in a range of micronutrients compared with the WLM...
August 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28924575/ex-vivo-tissue-imaging-for-radiology-pathology-correlation-a-pilot-study-with-a-small-bore-7-t-mri-in-a-rare-pigmented-ganglioglioma-exhibiting-complex-mr-signal-characteristics-associated-with-melanin-and-hemosiderin
#7
Kant M Matsuda, Ana Lopes-Calcas, Michael L Honke, Zoe O'Brien-Moran, Richard Buist, Michael West, Melanie Martin
To advance magnetic resonance imaging (MRI) technologies further for in vivo tissue characterization with histopathologic validation, we investigated the feasibility of ex vivo tissue imaging of a surgically removed human brain tumor as a comprehensive approach for radiology-pathology correlation in histoanatomically identical fashion in a rare case of pigmented ganglioglioma with complex paramagnetic properties. Pieces of surgically removed ganglioglioma, containing melanin and hemosiderin pigments, were imaged with a small bore 7-T MRI scanner to obtain T1-, T2-, and T2*-weighted image and diffusion tensor imaging (DTI)...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28921558/safety-and-efficacy-of-intravenous-iron-polymaltose-iron-sucrose-and-ferric-carboxymaltose-in-pregnancy-a-systematic-review
#8
REVIEW
Alaa Qassim, Ben W Mol, Rosalie M Grivell, Luke E Grzeskowiak
BACKGROUND: Intravenous (IV) iron in pregnancy is useful where oral iron is not tolerated or a rapid replenishment of iron is required. AIMS: To review the literature on the efficacy and safety of different IV iron preparations in the management of antenatal iron-deficiency anaemia (IDA). MATERIALS AND METHODS: We searched MEDLINE, Embase and Scopus from inception to June 2016. Eligible studies were randomised controlled trials (RCTs) and observational studies, involving administration of IV iron (ferric carboxymaltose (FCM), iron polymaltose (IPM) or iron sucrose (IS)), regardless of comparator, to manage antenatal IDA...
September 18, 2017: Australian & New Zealand Journal of Obstetrics & Gynaecology
https://www.readbyqxmd.com/read/28921403/biochar-composites-with-nano-zerovalent-iron-and-eggshell-powder-for-nitrate-removal-from-aqueous-solution-with-coexisting-chloride-ions
#9
Munir Ahmad, Mahtab Ahmad, Adel R A Usman, Abdullah S Al-Faraj, Adel S Abduljabbar, Mohammad I Al-Wabel
Biochar (BC) was produced from date palm tree leaves and its composites were prepared with nano zerovalent iron (nZVI-BC) and hen eggshell powder (EP-BC). The produced BC and its composites were characterized by SEM, XRD, BET, and FTIR for surface structural, mineralogical, and chemical groups and tested for their efficiency for nitrate removal from aqueous solutions in the presence and absence of chloride ions. The incidence of graphene and nano zerovalent iron (Fe(0)) in the nZVI-BC composite was confirmed by XRD...
September 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28919429/electrochemical-synthesis-of-ferrate-vi-using-sponge-iron-anode-and-oxidative-transformations-of-antibiotic-and-pesticide
#10
Xuhui Sun, Kexin Zu, He Liang, Lin Sun, Lingyun Zhang, Chuanyi Wang, Virender K Sharma
Passivation of anode is a main challenge in the electrochemical synthesis of ferrate(VI) (Fe(VI)O4(2-), Fe(VI)). A series of electrochemical approaches were employed including polarization curve, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS) to analyze the physicochemical processes involved in electrochemical synthesis of Fe(VI) using sponge iron and cast iron anodes. The results demonstrate that the sponge iron anode achieved higher yield of Fe(VI) compared to grey cast iron anode. The optimum condition to generate Fe(VI) using sponge iron was 35-50°C and 30mA/cm(2)...
September 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28914395/repetitive-on-demand-drug-release-from-polymeric-matrices-containing-a-macroscopic-spherical-iron-core
#11
Stefan A Rovers, Maartje F Kemmere, Jos T F Keurentjes, Richard Hoogenboom
A system for multiple on-demand drug release has been prepared that can be activated with an alternating magnetic field as external trigger. The core/shell samples have been developed based on a macroscopic spherical iron core coated with a thermoresponsive polymer, poly(styrene-stat-butyl methacrylate), containing ibuprofen as a model drug. During exposure of the samples to the magnetic field (ON state), the release rate of ibuprofen is significantly increased, up to 35 times the release rate without the magnetic field (OFF state)...
September 15, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28911658/identification-of-an-exposure-risk-to-heavy-metals-from-pharmaceutical-grade-rubber-stoppers
#12
Xianghui Li, Pingping Qian
Exposure to low concentrations of heavy metals and metalloids represents a well-documented risk to animal and human health. However, current standards (European Pharmacopeia [EP], United States Pharmacopoeia [USP], International Organization for Standardization [ISO], YBB concerned with rubber closures) only require testing for Zn in pharmaceutical-grade rubber stoppers and then using only pure water as a solvent. We extracted and quantified heavy metals and trace elements from pharmaceutical-grade rubber stoppers under conditions that might occur during the preparation of drugs...
July 2017: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/28910529/metal-ion-distribution-and-oxygen-vacancies-determine-activity-of-magnetically-recoverable-catalysts-in-methanol-synthesis
#13
Troy Oracko, Rigel Jaquish, Yaroslav B Losovyj, David Gene Morgan, Maren Pink, Barry D Stein, Valentin Yu Doluda, Olga P Tkachenko, Zinaida B Shifrina, Maxim E Grigoriev, Alexander I Sidorov, Esther M Sulman, Lyudmila M Bronstein
Here, we report on the development of novel Zn-, Zn-Cr-, and Zn-Cu-containing catalysts using magnetic silica (Fe3O4-SiO2) as support. Transmission electron microscopy, X-ray powder diffraction, and X-ray photoelectron spectroscopy showed that the iron oxide nanoparticles (NPs) are located in mesoporous silica pores and the magnetite (spinel) structure remains virtually unchanged despite the incorporation of Zn and Cr. According to X-ray photoelectron spectroscopy data, the Zn and Cr species are intermixed within the magnetite structure...
September 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28905627/an-aminocatalyzed-michael-addition-iron-mediated-decarboxylative-cyclization-sequence-for-the-preparation-of-2-3-4-6-tetrasubstituted-pyridines-scope-and-mechanistic-insights
#14
Mateus L Stivanin, Marcelo Duarte, Camila Sartori, Naylil M R Capreti, Celio F F Angolini, Igor D Jurberg
A novel, scalable strategy for the preparation of 2,3,4,6-tetrasubstituted pyridines is described. This protocol has two steps: an aminocatalyzed addition of ketones to alkylidene isoxazol-5-ones, followed by an iron-mediated decarboxylative cyclization event. Mechanistic insights for both steps are provided based on HRMS-ESI(+) studies.
September 14, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28905281/enhanced-degradation-of-acid-red-1-dye-using-a-coupled-system-of-zero-valent-iron-nanoparticles-and-sonolysis
#15
Shoniya Thomas, Sijumon V Abraham, Usha K Aravind, Charuvila T Aravindakumar
The heterogeneous catalytic degradation of a model azo dye, acid red 1 (AR1), initiated by zero valent iron nanoparticles (ZVINP), and its synergic effect with ultrasound (US) have been investigated in the present study. The treatment of AR1 using ZVINP at pH 3 showed maximum efficiency in terms of colour removal (53.0%) and mineralization (48.5% TOC reduction) after 25 min of reaction. However, the coupling of this system with US showed an enhanced efficiency against the decolourization and mineralization of AR1...
September 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28902992/removal-of-antibiotic-florfenicol-by-sulfide-modified-nanoscale-zero-valent-iron
#16
Zhen Cao, Xue Liu, Jiang Xu, Jing Zhang, Yi Yang, Junliang Zhou, Xinhua Xu, Gregory V Lowry
Florfenicol (FF, C12H14Cl2FNO4S), an emerging halogenated organic contaminant of concern was effectively degraded in water by sulfidized nanoscale zerovalent iron (S-nZVI). Sulfidized nZVI (62.5 m(2) g(-1)) that was prepared using a one-step method resulted in small Fe(0)/Fe-sulfide particles that were more stable against aggregation than unsulfidized nZVI (10.2 m(2) g(-1)). No obvious removal of FF was observed by unsulfidized nZVI. S-nZVI degraded FF, having a surface area normalized reaction rate constant of 3...
September 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28902207/preparation-and-characterization-of-crfewtio2-photoanodes-and-their-photoelectrochemical-activities-for-water-splitting
#17
Mohamad Mohsen Momeni, Yousef Ghayeb, Mojgan Shafiei
The chemical bath deposition (CBD) method was successfully applied to prepare WTiO2 nanotube arrays co-deposited with chromium, iron and chromium-iron nanoparticles. Various methods have been used in the characterization of synthetic co-deposited nanostructures. WTiO2 nanotubes can keep the nanotubular structures at low iron concentration in the CBD solution, as indicated by our FESEM results. Iron and chromium can be applied to improve the absorption capability of the WTiO2 nanotubes for the visible-light, according to the UV-Vis results...
September 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28901752/large-coercive-field-of-45-koe-in-a-magnetic-film-based-on-metal-substituted-%C3%AE%C2%B5-iron-oxide
#18
Shin-Ichi Ohkoshi, Kenta Imoto, Asuka Namai, Shizuka Anan, Marie Yoshikiyo, Hiroko Tokoro
Magnetic ferrites are stable, sustainable, and economical. Consequently, they have been used in various fields. The development of large coercive field (large Hc) magnetic ferrites is a very important but challenging issue to accelerate the spread of use and to expand practical applications. In this study, we prepared a rhodium-substituted ε-iron oxide film and observed a remarkably large Hc value of 35 kOe at room temperature. This is the largest value among magnetic ferrites to date. Such a large-Hc ferrite is expected to greatly expand the application of magnetic ferrites...
September 13, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28901139/injectable-and-self-healing-thermosensitive-magnetic-hydrogel-for-asynchronous-control-release-of-doxorubicin-and-docetaxel-to-treat-triple-negative-breast-cancer
#19
Wensheng Xie, Qin Gao, Zhenhu Guo, Dan Wang, Fei Gao, Xiumei Wang, Yen Wei, Lingyun Zhao
Integration of two or more drugs into a multiagent delivery system has been considered to have profound impact on both in vitro and in vivo cancer treatment due to their efficient synergistic effect. This study presents a cheap and simple chitosan hydrogel cross-linked with telechelic difunctional poly(ethylene glycol) (DF-PEG-DF) for synthesis of an injectable and self-healing thermosensitive dual-drug-loaded magnetic hydrogel (DDMH), which contains both doxorubicin (DOX) and docetaxel (DTX) for chemotherapy and iron oxide for magnetic hyperthermia induced stimuli responsive drug release...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28898954/degradation-of-2-4-6-trichlorophenol-with-peroxymonosulfate-catalyzed-by-soluble-and-supported-iron-porphyrins
#20
Tuğçe Günay, Yasemin Çimen
Degradation of 2,4,6-trichloropenol (TCP) with peroxymonosulfate (PMS) catalyzed by iron porphyrin tetrasulfonate ([FePTS)] was investigated in an 8-to-1 (v/v) CH3OH-H2O mixture. Typical reaction medium contained a 4.00 mL methanol solution of TCP (0.100 mmol), a 0.50 mL aqueous solution of catalyst (5.0 × 10(-4) mmol), and 0.100 mmol PMS (as 0.031 g of Oxone). The reaction was performed at ambient temperature. The conversion of TCP was 74% in 30 min and 80% in 6 h when the catalyst was [FePTS]. Amberlite IRA-900 supported [FePTS] catalyst was also prepared...
September 8, 2017: Environmental Pollution
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