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https://www.readbyqxmd.com/read/29144731/zwitterionic-manganese-and-gadolinium-metal-organic-frameworks-as-efficient-contrast-agents-for-in-vivo-magnetic-resonance-imaging
#1
Liang Qin, Zi-Yan Sun, Kai Cheng, Shu-Wen Liu, Jian-Xin Pang, Li-Ming Xia, Wen-Hua Chen, Zhen Cheng, Jin-Xiang Chen
Two water-stable three-dimensional Mn- and Gd-based metal-organic frameworks (MOFs), {[Mn2(Cmdcp)2(H2O)2]·H2O}n (1) and {[Gd(Cmdcp)(H2O)3](NO3)·3H2O}n (2, H3CmdcpBr = N-(4-carboxy benzyl)-(3,5-dicarboxyl)pyridinium bromide), have been prepared and analyzed. In vitro magnetic resonance imaging indicated that MOFs 1 and 2 possess relaxivity r1 values of 17.50 and 13.46 mM(-1)·S(-1), respectively, which are superior to that of the control Gd-DTPA (r1 = 4.87 mM(-1)·S(-1), DTPA = diethylene triamine pentaacetate)...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29141526/the-in-pancia-study-clinical-evaluation-of-gastrointestinal-dysfunction-and-failure-multiple-organ-failure-and-levels-of-citrulline-in-critically-ill-patients
#2
Nazzareno Fagoni, Simone Piva, Rosella Marino, Giovanni Chiarini, Daniela Ferrari, Eleonora Grespi, Rita Bertuetti, Silvia Barbieri, Nicola Latronico, Frank Rasulo
PURPOSE: Gastrointestinal dysfunction and failure (GID and GIF) in critically ill patients are a common, relevant, and underestimated complications in ICU patients. The aims of this study were (1) to determine plasmatic levels of citrulline, glutamine, and arginine as markers of GID/GIF in critically ill patients with or without GID/GIF with or without multiple organ failure (MOF) and (2) to assess the role of intra-abdominal hypertension in these patient groups. MATERIALS AND METHODS: This is a 1-year, monocentric (Italian hospital), prospective observational study...
January 1, 2017: Journal of Intensive Care Medicine
https://www.readbyqxmd.com/read/29139603/catalytic-transfer-hydrogenation-of-biomass-derived-carbonyls-over-hafnium-based-metal-organic-frameworks
#3
Avelino Corma, Pilar García-García, Sergio Rojas-Buzo
A series of highly crystalline, porous, hafnium-based metal-organic frameworks (MOFs) have shown to catalyze the transfer hydrogenation reaction of levulinic ester to produce γ-valerolactone using isopropanol as hydrogen donor and the results are compared with the zirconium-based counterparts. The role of the metal center in Hf-MOFs has been identified and reaction parameters optimized. NMR studies with isotopically labeled isopropanol evidences that the transfer hydrogenation occurs via a direct intermolecular hydrogen transfer route...
November 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/29138874/using-il-6-concentrations-in-the-first-24%C3%A2-h-following-trauma-to-predict-immunological-complications-and-mortality-in-trauma-patients-a-meta-analysis
#4
REVIEW
Zhi Qiao, Weikang Wang, Luxu Yin, Peng Luo, Johannes Greven, Klemens Horst, Frank Hildebrand
PURPOSE: In previous studies, interleukin-6 (IL-6) has been shown to have a high predictive value for the development of complications and mortality after trauma; however, there is some uncertainty around these results. The aim of this meta-analysis was to assess the value of early IL-6 levels (within the first 24 h after trauma) for predicting post-traumatic complications [acute respiratory distress syndrome (ARDS), systemic inflammatory response syndrome (SIRS), sepsis, multiple organ failure (MOF), and multiple organ dysfunction syndrome (MODS)] and mortality...
November 14, 2017: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/29137748/a-novel-synthesis-of-a-new-thorium-iv-metal-organic-framework-nanostructure-with-well-controllable-procedure-through-ultrasound-assisted-reverse-micelle-method
#5
Ghasem Sargazi, Daryoush Afzali, Ali Mostafavi
Reverse micelle (RM) and ultrasound assisted reverse micelle (UARM) were applied to the synthesis of novel thorium nanostructures as metal organic frameworks (MOFs). Characterization with different techniques showed that the Th-MOF sample synthesized by UARM method had higher thermal stability (354°C), smaller mean particle size (27nm), and larger surface area (2.02×10(3)m(2)/g). Besides, in this novel approach, the nucleation of crystals was found to carry out in a shorter time. The synthesis parameters of UARM method were designed by 2(k-1) factorial and the process control was systematically studied using analysis of variance (ANOVA) and response surface methodology (RSM)...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137740/morphology-dependent-sensing-performance-of-dihydro-tetrazine-functionalized-mof-toward-al-iii
#6
Sayed Ali Akbar Razavi, Mohammad Yaser Masoomi, Ali Morsali
A pillared MOF, [Zn(OBA)(H2DPT)0.5].DMF (TMU-34), based on dihydro tetrazine functionalized pillar spacer (H2DPT=3,6-di(pyridin-4-yl)-1,4-dihydro-1,2,4,5-tetrazine) and V-shape dicarboxylate linker (H2OBA=4,4'-oxybis(benzoic acid)) was synthesized by reflux and ultrasonic methods. The effects of sonication time, initial concentration of reagents and sonication power on size and morphology have been optimized. This MOF has been characterized by scanning electron microscopy, FT-IR spectra, X-ray powder diffraction and N2 adsorption at 77K...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29136896/hollow-mesoporous-cuco2o4-microspheres-derived-from-metal-organic-framework-a-novel-functional-materials-for-simultaneous-h2o2-biosensing-and-glucose-biofuel-cell
#7
Shiqiang Cui, Shuqing Gu, Yaping Ding, Jiangjiang Zhang, Zhen Zhang, Zongqian Hu
Hollow mesoporous CuCo2O4 (meso-CuCo2O4) microspheres were successfully synthesized by decomposing metal-organic frameworks (MOFs) as the template. The as-prepared CuCo2O4 microspheres were first simultaneously used for H2O2 biosensing and glucose biofuel cell (GFC) as the enzyme mimic. The resulting of meso-CuCo2O4 displayed not only excellent catalytic performances to H2O2 including a super-fast response time (within 2s), a super-high sensitivity (654.23 μA mM(-1) cm(-2)) and a super-low detection limit (3nM at S/N = 3) on the sensor, but also great values in GFC as anode material with an open circuit voltage of 0...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136546/multi-component-hybrid-soft-ionogels-for-photoluminescence-tuning-and-sensing-organic-solvent-vapors
#8
Jing Ma, Bing Yan
This paper tries to prepare soft ionogels through the carboxyl ion liquid (IM(+)Br(-)) as double chemical linker connecting both Bio-MOF-1 (Zn8(ad)4(BPDC)6O·2Me2NH2, BPDC=biphenyl-4,4'-dicarboxylate, Ad = adeninate) and lanthanide complexes. Among anionic Bio-MOF-1 interacts with IM(+)Br(-) through cation exchange (IM(+)) to form BMOF-IM and lanthanide ions are further introduced through the coordination to the carboxylic group of IM(+) together with Phen (1,10-phenanthroline) as assistant ligand for Ln(3+) (Ln = Eu, Tb or Eu/Tb)...
November 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29134677/hybridization-of-mofs-and-cofs-a-new-strategy-for-construction-of-mof-cof-core-shell-hybrid-materials
#9
Yongwu Peng, Meiting Zhao, Bo Chen, Zhicheng Zhang, Ying Huang, Fangna Dai, Zhuangchai Lai, Xiaoya Cui, Chaoliang Tan, Hua Zhang
The exploration of new porous hybrid materials is of great importance because of their unique properties and promising applications in separation of materials, catalysis, etc. Herein, for the first time, by integration of metal-organic frameworks (MOFs) and covalent organic frameworks (COFs), a new type of MOF@COF core-shell hybrid material, i.e., NH2 -MIL-68@TPA-COF, with high crystallinity and hierarchical pore structure, is synthesized. As a proof-of-concept application, the obtained NH2 -MIL-68@TPA-COF hybrid material is used as an effective visible-light-driven photocatalyst for the degradation of rhodamine B...
November 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29134075/antifungal-activity-of-water-stable-copper-containing-metal-organic-frameworks
#10
Supaporn Bouson, Atiweena Krittayavathananon, Nutthaphon Phattharasupakun, Patcharaporn Siwayaprahm, Montree Sawangphruk
Although metal-organic frameworks (MOFs) or porous coordination polymers have been widely studied, their antimicrobial activities have not yet been fully investigated. In this work, antifungal activity of copper-based benzene-tricarboxylate MOF (Cu-BTC MOF), which is water stable and industrially interesting, is investigated against Candida albicans, Aspergillus niger, Aspergillus oryzae and Fusarium oxysporum. The Cu-BTC MOF can effectively inhibit the growth rate of C. albicans and remarkably inhibit the spore growth of A...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29133873/coordinative-alignment-of-chiral-molecules-to-control-over-the-chirality-transfer-in-spontaneous-resolution-and-asymmetric-catalysis
#11
Zhengqiang Xia, Xu Jing, Cheng He, Xiaoge Wang, Chunying Duan
The production and availability of enantiomerically pure compounds that spurred the development of chiral technologies and materials are very important to the fine chemicals and pharmaceutical industries. By coordinative alignment of enantiopure guests in the metal‒organic frameworks, we reported an approach to control over the chirality of homochiral crystallization and asymmetric transformation. Synthesized by achiral triphenylamine derivatives, the chirality of silver frameworks was determined by the encapsulated enantiopure azomethine ylides, from which clear interaction patterns were observed to explore the chiral induction principles...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29133796/pd-supported-on-carbon-containing-nickel-nitrogen-and-sulfur-for-ethanol-electrooxidation
#12
Zi-Rui Yang, Shang-Qing Wang, Jing Wang, Ai-Ju Zhou, Chang-Wei Xu
Carbon material containing nickel, nitrogen and sulfur (Ni-NSC) has been synthesized using metal-organic frameworks (MOFs) as precursor by annealing treatment with a size from 200 to 300 nm. Pd nanoparticles supported on the Ni-NSC (Pd/Ni-NSC) are used as electrocatalysts for ethanol oxidation in alkaline media. Due to the synergistic effect between Pd and Ni, S, N, free OH radicals can form on the surface of Ni, N and S atoms at lower potentials, which react with CH3CO intermediate species on the Pd surface to produce CH3COO(-) and release the active sites...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29131634/general-oriented-synthesis-of-precise-carbon-confined-nanostructures-by-low-pressure-vapor-superassembly-and-controlled-pyrolysis
#13
Jiashen Meng, Xiong Liu, Jiantao Li, Qi Li, Chuan Zhao, Lin-Han Xu, Xuanpeng Wang, Fang Liu, Wei Yang, Xiaoming Xu, Ziang Liu, Chaojiang Niu, Liqiang Mai
Earth-abundant metal-based nanostructured materials have been widely studied for potential energy conversion and storage. However, controlled synthesis of functional nanostructures with high electron conductivity, high reaction activity and structural stability is still a formidable challenge for further practical applications. Herein, for the first time, we develop a facile, efficient and general method for the oriented synthesis of precise carbon-confined nanostructures by low-pressure vapor superassembly of a thin metal-organic framework (MOF) shell and subsequent controlled pyrolysis...
November 13, 2017: Nano Letters
https://www.readbyqxmd.com/read/29131604/from-zn-ii-carboxylate-to-double-walled-zn-ii-carboxylato-phosphate-mof-change-in-the-framework-topology-capture-and-conversion-of-co2-and-catalysis-of-strecker-reaction
#14
Mayank Gupta, Dinesh De, Kapil Tomar, Parimal K Bharadwaj
The ligand H2L has been built by linking an imidazole moiety to the 5-position of isophthalic acid. It forms two types of porous frameworks, {[Zn(L)]·2DMF·2H2O}n (1) and {[(CH3)2NH2][Zn2(L)(H2O)PO4]·2DMF}n (2). 1 is a porous neutral framework and has rtl rutile 3,6-conn topology, while 2 is an organo-metallophosphate anionic porous framework with double-walled hexagonal channels. Framework 1' (desolvated) exhibits moderate CO2 adsorption (58 cc g(-1) at 273 K, 1 bar), whereas 2' (desolvated) shows a microporous nature with a high adsorption of CO2 (111...
November 13, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29131569/efficient-and-lightweight-electromagnetic-wave-absorber-derived-from-metal-organic-frameworks-encapsulated-cobalt-nanoparticles
#15
Haicheng Wang, Long Xiang, Wei Wei, Jing An, Jun He, Chunhong Gong, Yanglong Hou
Magnetic nanoparticles (NPs)/highly porous carbon nanocomposites, derived from metal organic frameworks (MOFs) are of great potential candidates for electromagnetic wave absorbents because of their excellent properties such as strong absorption, low density and good compatibility. In this study, a facile and effective method was developed to synthesize Co magnetic NPs/metal organic frameworks (Co NPs/ZIF-67) nanocomposites. The Co NPs/porous C composites were subsequently obtained by annealing the Co NPs/ZIF-67 nanocomposites at different temperatures under inert atmosphere...
November 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29127901/cerium-dioxide-doped-carboxyl-fullerene-as-novel-nanoprobe-and-catalyst-in-electrochemical-biosensor-for-amperometric-detection-of-the-cyp2c19-2-allele-in-human-serum
#16
Chengli Zhang, Junlin He, Yuchan Zhang, Jun Chen, Yilin Zhao, Yazhen Niu, Chao Yu
The disposition dose of clopidogrel is different in CYP2C19*2 gene carriers and non-carriers. High-dose clopidogrel has been recommended to overcome a low-responsiveness to clopidogrel in patients with the CYP2C19*2 gene. To guide the choice of clopidogrel dosage and catalyse a development in the field of personalized therapy, we developed an ultrasensitive electrochemical biosensor to detect CYP2C19*2 gene. We constructed a novel assay based on cerium dioxide (CeO2)-functionalized carboxyl fullerene (c-C60) supported by Pt nanoparticles (c-C60/CeO2/PtNPs) for signal amplification...
November 8, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29126465/facile-synthesis-of-magnetic-metal-organic-frameworks-for-highly-efficient-proteolytic-digestion-used-in-mass-spectrometry-based-proteomics
#17
Rui Zhai, Yifeng Yuan, Fenglong Jiao, Feiran Hao, Xiang Fang, Yangjun Zhang, Xiaohong Qian
Mass spectrometry (MS) based bottom-up strategy is now the first choice for proteomics analysis. In this process, highly efficient and complete enzymatic degradation of protein samples is extremely important to achieve in-depth protein coverage and high-throughput protein profiling. However, conventional in-solution digestion suffer from long digestion time and enzyme autolysis that limit the protein sample processing throughput and identification accuracy. Here, we developed a novel type of magnetic metal organic frameworks (MOFs)-based immobilized enzyme reactor, Fe3O4@DOTA-ZIF-90-trypsin...
November 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29126073/facile-synthesis-of-ultrafine-cobalt-oxides-embedded-into-n-doped-carbon-with-superior-activity-in-hydrogenation-of-4-nitrophenol
#18
Xiuling Zhang, Na Wang, Longlong Geng, Junna Fu, Hui Hu, Dashuai Zhang, Baoyong Zhu, Jesse Carozza, Haixiang Han
Design and synthesis of low-cost catalysts with high activity and stability for hydrogenation reactions is an important research area of applied catalysis. In this work, we present a kind of ultrafine cobalt oxides encapsulated by N-doped carbon (donated as CoOx/CN) as efficient catalysts for hydrogenation of 4-nitrophenol (4-NP) process. The CoOx/CN was fabricated through a pyrolysis strategy using an N-containing metal-organic framework (Co-MOF) as precursor followed by a fine thermal-treatment. With an optimized pyrolysis temperature of 500 °C, the CoOx species present as ultrafine particles highly dispersed in the obtained catalyst (CoOx/CN-500)...
November 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29119671/a-microribbon-hybrid-structure-of-coox-moc-encapsulated-in-n-doped-carbon-nanowire-derived-from-mof-as-efficient-oxygen-evolution-electrocatalysts
#19
Tan Huang, Yu Chen, Jong-Min Lee
Developing highly efficient electrocatalysts for oxygen evolution is vital for renewable and sustainable energy production and storage. Herein, nitrogen-doped carbon encapsulated CoOx-MoC heterostructures are reported for the first time as high performance oxygen evolution electrocatalysts. The composition can be tuned by the addition of a Mo source to form a nanowire-assembled hierarchically porous microstructure, which can enlarge the specific surface area, thus exposing more active sites, facilitating mass transport and charge transfer...
November 9, 2017: Small
https://www.readbyqxmd.com/read/29119184/highly-efficient-hydrogen-evolution-electrocatalysts-based-on-coupled-molybdenum-phosphide-and-reduced-graphene-oxide-derived-from-mofs
#20
Ji-Sen Li, Jing-Quan Sha, Bing Du, Bo Tang
A coupled hybrid of molybdenum phosphide (MoP) and reduced graphene oxide has been prepared for the first time utilizing Mo-MOFs as precursors through a facile method. The nanocomposite exhibits superior electrocatalytic performance towards the HER, and is one of the best high-performance MoP-based electrocatalysts under acidic conditions reported so far.
November 9, 2017: Chemical Communications: Chem Comm
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