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Biswa Nath Bhadra, Ji Yoon Song, Nazmul Abedin Khan, Sung Hwa Jhung
A new metal-organic framework (MOF) composite consisting of Ti- and Zn-based MOFs (ZIF-8(x)@H2N-MIL-125; in brief, ZIF(x)@MOF) was designed and synthesized. The pristine MOF [H2N-MIL-125 (MOF)]- and an MOF-composite [ZIF(30)@MOF]-derived mesoporous carbons consisting of TiO2 nanoparticles were prepared by pyrolysis (named MDC-P and MDC-C, respectively). MDC-C showed a higher surface area, larger pore sizes, and larger mesopore volumes than MDC-P. In addition, the TiO2 nanoparticles on MDC-C have more uniform shapes and sizes, and are smaller than those of MDC-P...
August 18, 2017: ACS Applied Materials & Interfaces
Liman Hou, Mingdong Zhou, Xiaozhe Dong, Lei Wang, Zhigang Xie, Dewen Dong, Ning Zhang
Polymer brushes are for the first time used to induce the synthesis of metal-organic frameworks (MOFs). The semi-fixed polymer chains provide a confined environment, which allows a mild growth of MOFs in-between polymer chains to give surface-attached spherical MOF nanoparticles, in contrast to the larger MOF cubics/plates formed simultaneously in solution. Polymer brushes bearing carboxylate acid functionalities are indispensible for the formation of surface bound MOFs, while no MOF nanoparticles are observed on neutral polymer brushes...
August 17, 2017: Chemistry: a European Journal
Alberto Chisvert, Juan L Benedé, Jared L Anderson, Stephen A Pierson, Amparo Salvador
With the aim of contributing to the development and improvement of microextraction techniques, a novel approach combining the principles and advantages of stir bar sorptive extraction (SBSE) and dispersive liquid-liquid microextraction (DLLME) is presented. This new approach, termed stir bar dispersive liquid microextraction (SBDLME), involves the addition of a magnetic ionic liquid (MIL) and a neodymium-core magnetic stir bar into the sample allowing the MIL coat the stir bar due to physical forces (i.e., magnetism)...
August 29, 2017: Analytica Chimica Acta
Myrthe A M van Delft, Marije K Verheul, Leonie E Burgers, Veerle F A M Derksen, Annette H M van der Helm-van Mil, Diane van der Woude, Tom W J Huizinga, René E M Toes, Leendert A Trouw
BACKGROUND: Anti-carbamylated protein (anti-CarP) antibodies have recently been reported to occur in around 45% of rheumatoid arthritis (RA) patients and to have prognostic and diagnostic properties. At present, the breadth and molecular make-up of the anti-CarP antibody response is ill defined. To understand the anti-CarP antibody immune response and potential immune effector mechanisms it can recruit, we determined the anti-CarP antibody isotype and IgG-subclass usage in RA patients...
August 15, 2017: Arthritis Research & Therapy
Larissa Rodrigues Silva, Adriano Francisco Alves, Luiz Henrique Agra Cavalcante-Silva, Renan Marinho Braga, Reinaldo Nóbrega de Almeida, José Maria Barbosa-Filho, Márcia Regina Piuvezam
Milonine is a morphinandienone alkaloid from Cissampelos sympodialis Eichl (Menispermaceae), a plant used in Brazil to treat inflammatory disorders. In this study, we evaluated the anti-inflammatory and analgesic activity of milonine (MIL) by using classical experimental models of inflammation and nociception. The results showed that MIL reduced the paw edema formation induced by lipopolysaccharide, prostaglandin E2, and bradykinin, without interfering with the serotonin-induced edema. With respect to the nociception experiments, MIL decreased the exudate into the peritoneum induced by acetic acid, maintaining the tissue morphology...
August 11, 2017: Inflammation
T C Messemaker, H M M Mikkers, T W Huizinga, R E M Toes, A H M van der Helm-van Mil, F Kurreeman
Innate immune cells, such as monocytes, can adopt a long-lasting pro-inflammatory phenotype, a phenomenon called 'trained immunity'. In trained immunity, increased cytokine levels of genes, like interleukin (IL)-6 and tumor necrosis factor (TNF)-α, are observed, which are associated with increased histone 3 lysine 4 trimethylation (H3K4me3) in the promoter region. As systemic IL6 and TNFα levels are increased in rheumatoid arthritis (RA) patients and monocytes are known to be the primary producers of TNFα and IL6, we hypothesized that 'trained immunity' signals may be observed at these genes in monocytes from RA patients...
August 10, 2017: Genes and Immunity
Marta Tavares-Silva, Mohamed Alaa, Sara Leite, José Oliveira-Pinto, Lucas Lopes, Adelino F Leite-Moreira, André P Lourenço
The choice of inodilator drug in the acute management of patients with pulmonary hypertension (PH) having right ventricular (RV) failure remains unsettled and challenging. Comprehensive experimental evaluations may provide further insight and fundamental translational research clues to support inodilator selection and clinical trial design. Our aim was to compare acute dose-response hemodynamic effects of inodilators dobutamine (DOB), milrinone (MIL), and levosimendan (LEV) in chronic experimental PH. Seven-week-old male Wistar rats were randomly injected with 60 mg·kg(-1) monocrotaline (MCT) or vehicle (Ctrl, n = 7) and underwent systemic and pulmonary artery (PA) pressure and RV pressure-volume (PV) hemodynamic evaluation under halogenate anesthesia 24 to 30 days after injection...
September 2017: Journal of Cardiovascular Pharmacology and Therapeutics
Seyed Dariush Taherzade, Janet Soleimannejad, Aliakbar Tarlani
Nanostructures of MIL-100 were synthesized and used as a drug delivery platform for two members of the Tetracycline family. Doxycycline monohydrate (DOX) and Tetracycline hydrochloride (TC) were loaded separately on nano-MIL-100 (nanoparticles of drug@carrier were abbreviated as DOX@MIL-100 and TC@MIL-100). Characterizations were carried out using FT-IR, XRD, BET, DLS, and SEM. The FT-IR spectra revealed that the drugs were loaded into the framework of the carrier. The XRD patterns of DOX@MIL-100 and TC@MIL-100 indicated that no free DOX or TC were present...
August 6, 2017: Nanomaterials
Dries Jonckheere, Julian A Steele, Birgit Claes, Bart Bueken, Laurens Claes, Bert Lagrain, Maarten B J Roeffaers, Dirk E De Vos
Metal-organic frameworks (MOFs) are investigated for the adsorption of aromatic amino acids L-phenylalanine (L-Phe), L-tryptophan (L-Trp) and L-tyrosine (L-Tyr) from aqueous solutions. After screening a range of water-stable MOFs, the hydrophobic Zr-MOF MIL-140C emerged as the most performant material, exhibiting uptakes of 15 wt% for L-Trp and 20 wt% for L-Phe. These uptakes are 5 to 10 wt% higher than those of large-pore zeolites Beta and Y. Both single-compound and competitive adsorption isotherms for L-Phe and L-Trp were experimentally obtained at the natural pH of these amino acid mixtures without additional pH-modification (pH 6...
August 7, 2017: ACS Applied Materials & Interfaces
Sainan Zhang, Peipei Han, Yan Xia
Quaternary amine functionalized metal-organic framework MIL-101(Cr) (MIL-101(Cr)-NMe3) was prepared as the sorbent for the magnetic solid-phase extraction (MSPE) of azide from sartan drugs before ion chromatography determination. Magnetization of MIL-101-NMe3 were achieved concurrently by adding MIL-101-NMe3 and Fe3O4@SiO2 to the sample solution under ultrasonication. The prepared Fe3O4@SiO2/MIL-101-NMe3 gave the adsorption capacity of 37.5mgg(-1). The developed method had a detection limit of 0.24μgL(-1) and quantitation limit of 0...
July 10, 2017: Journal of Chromatography. A
Yuan Xu, Xueli Gao, Xiaojuan Wang, Qun Wang, Zhiyong Ji, Xinyan Wang, Tao Wu, Congjie Gao
A hydrophilic, hydrostable porous metal organic framework (MOF) material-MIL-101 (Cr) was successfully doped into the dense selective polyamide (PA) layer on the polysulfone (PS) ultrafiltration (UF) support to prepare a new thin film nanocomposite (TFN) membrane for water desalination. The TFN-MIL-101 (Cr) membranes were characterized by SEM, AFM, XPS, wettability measurement and reverse osmosis (RO) test. The porous structures of MIL-101 (Cr) can establish direct water channels in the dense selective PA layer for water molecules to transport through quickly, leading to the increasing water permeance of membranes...
October 26, 2016: Materials
Tao Chen, Cong Zhang, Yuemei Qin, Haiguan Yang, Peng Zhang, Fanggui Ye
A cationic porous framework with mobile anions (MIL-101(Cr)-Cl) was easily and successfully synthesized by utilizing the stronger affinity of F(-) to Al(3+) than Cr(3+) in the charge-balanced framework of MIL-101(Cr). The structure, morphology and porosity of MIL-101(Cr)-Cl were characterized. The obtained new materials retain the high surface area, good thermostability, and structure topology of MIL-101(Cr). With the mobile Cl(-) anion, MIL-101(Cr)-Cl can be used as an ion-exchange material for anionic organic pollutions...
July 30, 2017: Materials
Kasimayan Uma, Guan-Ting Pan, Thomas C-K Yang
Abstract: Metal organic framework (MOF) of MIL-101(Cr)-Silica (SiO₂) composites with highly mesoporous and uniform dispersions were synthesized by a microwave-assisted hydrothermal method followed by the sol-gel technique. Water vapor adsorption experiments were conducted on the MIL-101(Cr)-SiO₂ composites for industrial adsorption chiller applications. The effects of MIL-101(Cr)-SiO₂ mixing ratios (ranging from 0% to 52%), the surface area and amount of Lewis and Brønsted sites were comprehensively determined through water vapor adsorption experiments and the adsorption mechanism is also explained...
June 2, 2017: Materials
Tobias Preiß, Andreas Zimpel, Stefan Wuttke, Joachim O Rädler
Metal-organic framework nanoparticles (MOF NPs) are promising guest-host materials with applications in separation, storage, catalysis, and drug delivery. However, on- and off-loading of guest molecules by porous MOF nanostructures are still poorly understood. Here we study uptake and release of fluorescein by two representative MOF NPs, MIL-100(Fe) and MIL-101(Cr). Suspensions of these MOF NPs exhibit well-defined size distributions and crystallinity, as verified by electron microscopy, dynamic light scattering, and X-ray diffraction...
February 22, 2017: Materials
Lili Liu, Xishi Tai, Xiaojing Zhou
Post-synthesis modification is a useful method for the functionalization of metal-organic frameworks (MOFs). A novel catalyst Au@MIL-101-ED-SA (ED = ethylenediamine, SA = salicylaldehyde), containing coexisting Au(3+) ions and Au⁰ nanoparticles, was prepared successfully by post-synthesis modification with ethylenediamine, salicylaldehyde and gold. Gold nanoparticles supported on MIL-101 (Au@MIL-101) were prepared successfully by the impregnation method. Au@MIL-101-ED-SA and Au@MIL-101 were characterized by N₂ adsorption-desorption, X-ray diffraction, infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, and inductively coupled plasma-optical emission spectrometry...
January 25, 2017: Materials
Aiping Tang, Cheng Li, Zhihong Chen, Tang Li
Type 1 diabetes (T1D) is an autoimmune disease characterized by a selective destruction of insulin-secreting β-cells. Both T cells and B cells serve a crucial role in pathogenesis and development of T1D. CD20 is a specific membrane antigen of B lymphocytes, while interleukin (IL)‑10 is an important cytokine secreted by T helper 2 cells and has a short half‑life in vivo. The combined effect of anti‑CD20 and IL‑10 on immune function of mice with T1D remains unknown. In the present study, 30 non‑obese diabetic (NOD) mice were treated with anti‑CD20 and adenoviral vector‑mediated interleukin‑10 (Ad‑mIL‑10) therapy...
July 28, 2017: Molecular Medicine Reports
Hossam E Emam, Reda M Abdelhameed
Protective textiles against harmful solar radiation are quite important materials for outdoor workers to secure their skin from several diseases. Current report focuses on production of anti-ultraviolet radiation (UVR) textiles by incorporation of nano metal organic frameworks (n-MOFs). Two different MIL-MOFs namely, MIL-68(In)-NH2 and MIL-125(Ti)-NH2 were immediately formed inside natural textiles (cotton & silk) matrix in nano size using quite simple and one-pot process. The formation of n-MIL-MOFs inside textiles were confirmed by using electron microscope and X-ray diffraction...
July 26, 2017: ACS Applied Materials & Interfaces
Qiu-Xia He, Yao Jiang, Peng Tan, Xiao-Qin Liu, Ju-Xiang Qin, Lin-Bing Sun
Cu(+)-containing materials have drawn much attention in various applications because they are versatile, nontoxic, and low-cost. However, the difficulty of selective reduction and the poor stability of Cu(+) species are now pretty much the agendas. Here, controlled construction of supported Cu(+) sites in MIL-100(Fe) was realized under mild conditions (200 °C, 5 h) via a vapor-reduction strategy (VRS). Remarkably, the yield of Cu(+) reaches 100%, which is quite higher than the traditional high-temperature autoreduction method with a yield less than 50% even at 700 °C for 12 h...
July 27, 2017: ACS Applied Materials & Interfaces
Yudan Wang, Xinpeng Dai, Xi He, Lin Chen, Xiaohong Hou
In this work, MIL-101(Cr)@GO (Graphite Oxide) was synthesized using a hydrothermal synthesis method and was applied as a dispersive micro-solid-phase extraction (D-μ-SPE) sorbent for the efficient concentration of four residual drugs (metronidazole, MNZ; tinidazole, TNZ; chloramphenicol, CAP; sulfamethoxazole, SMX). Meanwhile, the extraction process was optimized by combining it with microwave-assisted extraction. Factors affecting the D-μ-SPE efficiency, such as selection of sorbent materials, pH of the sample solution, salting-out effect, amount of used material, extraction time, desorption solvent and desorption time, were studied...
July 11, 2017: Journal of Pharmaceutical and Biomedical Analysis
Emily Mason, Marie Edmonds, Alexandra V Turchyn
The flux of carbon into and out of Earth's surface environment has implications for Earth's climate and habitability. We compiled a global data set for carbon and helium isotopes from volcanic arcs and demonstrated that the carbon isotope composition of mean global volcanic gas is considerably heavier, at -3.8 to -4.6 per mil (‰), than the canonical mid-ocean ridge basalt value of -6.0‰. The largest volcanic emitters outgas carbon with higher δ(13)C and are located in mature continental arcs that have accreted carbonate platforms, indicating that reworking of crustal limestone is an important source of volcanic carbon...
July 21, 2017: Science
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