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https://www.readbyqxmd.com/read/28526350/designing-novel-bioconjugates-of-hydroxyethylcellulose-and-salicylates-for-potential-pharmaceutical-and-pharmacological-applications
#1
Khawar Abbas, Muhammad Amin, Muhammad Ajaz Hussain, Muhammad Sher, Syed Nasir Abbas Bukhari, Ibrahim Jantan, Kevin J Edgar
The present study deals with fabrication of macromolecular prodrugs (MPDs) of salicylic acid (SA) and aspirin (ASP) based on a hydrophilic cellulose ether, hydroxyethylcellulose (HEC). Degrees of substitution (DS) of SA and ASP per HEC repeating unit (HEC-RU) were achieved ranging from 0.60-2.18 and 0.53-1.50, respectively. The amphiphilic HEC-SA conjugate 2 assembled into nanowire-like structures, while HEC-ASP conjugate 6 formed nanoparticles (diameter 300-700nm) at a water/DMSO interface. After oral administration in rabbit models, conjugates 2 and 6 showed plasma half-life of 6...
May 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28526203/quantitative-evaluation-of-inhibitory-effect-of-various-substances-on-anaerobic-ammonia-oxidation-anammox
#2
Tomotaka Nakamura, Yuhki Harigaya, Yuya Kimura, Megumi Kuroiwa, Yuhri Kurata, Kazuichi Isaka, Yuichi Suwa
The inhibitory effect of 20 substances of various chemical species on the anaerobic ammonia oxidation (anammox) activity of an enrichment culture, predominated by Candidatus Brocadia, was determined systematically by using a (15)N tracer technique. The initial anammox rate was determined during first 25 min with a small-scale anaerobic batch incubation supplemented with possible inhibitors. Although Cu(2+) and Mn(2+) did not inhibit anammox, the remaining 18 substances [Ni(2+), Zn(2+), Co(2+), [Formula: see text] , Fe(2+), 4 amines, ethylenediaminetetraacetic acid (EDTA), ethylenediamine-N,N'-bis (2-hydroxyphenylacetic acid) (EDDHA), citric acid, nitrilotriacetic acid (NTA), N,N-dimethylacetamide (DMA), 1,4-dioxane, dimethyl sulfoxide (DMSO), N,N-dimethylformamide (DMF) and tetrahydrofuran (THF)] were inhibitory...
May 16, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28525865/a-selective-naked-eye-chemosensor-derived-from-2-methoxybenzylamine-and-2-3-dihydroxybenzaldehyde-synthesis-spectral-characterization-and-electrochemistry-of-its-bis-bidentates-schiff-bases-metal-complexes
#3
Aggoun Djouhra, Ourari Ali, Ruiz-Rosas Ramiro, Morallon Emilia
A new colorimetric receptor HL, acting as a bidentate Schiff base ligand, has been synthesized by condensation of 2-methoxybenzylamine on 2,3-dihydroxybenzaldehyde in a methanolic solution. Interestingly, this chelating agent can selectively detect Cu(2+), Co(2+), Fe(2+) and Fe(3+) ions with a simple and an easy-to-make, well defined naked-eye visible color changes in two different solvents like acetonitrile and methanol. This bidentate ligand coordinates three metal ions of Co(II), Cu(II) and Fe(II) via nitrogen and oxygen atoms...
May 10, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28521788/methanol-extract-of-dicranopteris-linearis-l-leaves-impedes-acetaminophen-induced-liver-intoxication-partly-by-enhancing-the-endogenous-antioxidant-system
#4
Zainul Amiruddin Zakaria, Farah Hidayah Kamisan, Maizatul Hasyima Omar, Nur Diyana Mahmood, Fezah Othman, Siti Selina Abdul Hamid, Muhammad Nazrul Hakim Abdullah
BACKGROUND: The present study investigated the potential of methanolic extract of Dicranopteris linearis (MEDL) leaves to attenuate liver intoxication induced by acetaminophen (APAP) in rats. METHODS: A group of mice (n = 5) treated orally with a single dose (5000 mg/kg) of MEDL was first subjected to the acute toxicity study using the OECD 420 model. In the hepatoprotective study, six groups of rats (n = 6) were used and each received as follows: Group 1 (normal control; pretreated with 10% DMSO (extract's vehicle) followed by treatment with 10% DMSO (hepatotoxin's vehicle) (10% DMSO +10% DMSO)), Group 2 (hepatotoxic control; 10% DMSO +3 g/kg APAP (hepatotoxin)), Group 3 (positive control; 200 mg/kg silymarin +3 g/kg APAP), Group 4 (50 mg/kg MEDL +3 g/kg APAP), Group 5 (250 mg/kg MEDL +3 g/kg APAP) or Group 6 (500 mg/kg MEDL +3 g/kg APAP)...
May 18, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28521075/quantifying-hydrogen-bond-populations-in-dmso-water-mixtures
#5
Carlos R Baiz, Kwang-Im Oh, Kavya Rajesh, John F Stanton
Dimethyl sulfoxide (DMSO) disrupts the hydrogen-bond networks in water. DMSO's widespread uses as a cosolvent, along with its unusual attributes, have inspired numerous studies. In this study, infrared absorption spectroscopy of the S=O stretch combined with molecular dynamics and quantum chemistry models were used to directly quantify DMSO/water hydrogen bond populations in binary mixtures. Singly H-bonded species are dominant at 10 mol%, due to strong DMSO-water interactions. We found an unexpected increase in non-hydrogen-bonded DMSO near the eutectic point (~35 mol%) which also correlates with several abnormalities in the solution's bulk properties...
May 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28520505/early-blockade-of-matrix-metalloproteinases-in-spinal-cord-injured-dogs-results-in-a-long-term-increase-in-bladder-compliance
#6
Jonathan Michael Levine, Noah D Cohen, Thomas Fandel, Gwendolyn Joan Levine, Joseph M Mankin, John F Griffin, Sharon C Kerwin, C Elizabeth Boudreau, Alpa Trivedi, Linda Noble-Haeusslein
Spinal cord injury (SCI) is often accompanied by reduced bladder compliance, which contributes to adverse conditions including urinary tract infections and vesicoureteral reflux. Reduced compliance is, in part, attributed to extensive remodeling of the bladder wall including the extracellular matrix (ECM). Here we tested the hypothesis that blockade of matrix metalloproteinases (MMPs), known for their ability to remodel the ECM, improves bladder compliance in dogs with SCI. We first evaluated dogs with naturally occurring SCIs resulting from intervertebral disc herniation (IVDH)...
May 18, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28516988/syntheses-and-catalytic-oxotransfer-activities-of-oxo-molybdenum-vi-complexes-of-a-new-aminoalcohol-phenolate-ligand
#7
M K Hossain, M Haukka, R Sillanpää, D A Hrovat, M G Richmond, E Nordlander, A Lehtonen
The new aminoalcohol phenol 2,4-di-tert-butyl-6-(((2-hydroxy-2-phenylethyl)amino)methyl)phenol (H2L) was prepared by a facile solvent-free synthesis and used as a tridentate ligand for new cis-dioxomolybdenum(vi)(L) complexes. In the presence of a coordinating solvent (DMSO, MeOH, pyridine), the complexes crystallise as monomeric solvent adducts while in the absence of such molecules, a trimer with asymmetric Mo[double bond, length as m-dash]O→Mo bridges crystallises. The complexes can catalyse epoxidation of cis-cyclooctene and sulfoxidation of methyl-p-tolylsulfide, using tert-butyl hydroperoxide as oxidant...
May 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28516158/a-management-algorithm-for-mitomycin-c-induced-cystitis
#8
Amy N Luckenbaugh, Rory M Marks, David C Miller, Alon Z Weizer, John T Stoffel, Jeffrey S Montgomery
Background/Objective: A post-bladder tumor resection dose of MMC can reduce non-invasive papillary (pTa) bladder cancer recurrences by up to 40%; this treatment is recommended in both the AUA and EUA non-muscle-invasive bladder cancer guidelines. A common complication of this treatment is eosinophilic cystitis. Symptoms range from mild urinary frequency and urgency to debilitating pain and dysuria. Currently, there is no established treatment algorithm for MMC-induced cystitis. Methods: Members of the Urologic Surgery Quality Collaborative (USQC), a group composed of over 160 private and academic urologists, met to discuss the management of patients with cystitis following MMC therapy...
April 27, 2017: Bladder Cancer
https://www.readbyqxmd.com/read/28514742/effect-and-mechanism-of-inhibition-of-pi3k-akt-mtor-signal-pathway-on-chronic-neuropathic-pain-and-spinal-microglia-in-a-rat-model-of-chronic-constriction-injury
#9
Jian-Rong Guo, Huan Wang, Xiao-Ju Jin, Dong-Lin Jia, Xun Zhou, Qiang Tao
OBJECTIVE: To explore the effects of inhibition of PI3K/Akt/mTOR signal pathway on chronic neuropathic pain (CNP) and spinal microglia in a rat model of chronic constriction injury (CCI). METHODS: Male SD rats were assigned into control, sham, CCI, wortmannin, dimethyl sulfoxide (DMSO) and wortmannin-positive control groups. Paw withdrawal mechanical threshold (PWMT) and thermal withdrawal latency (TWL) were recorded. qRT-PCR and Western blotting were used to detect PI3K, Akt and mTOR expressions and their phosphorylation...
May 5, 2017: Oncotarget
https://www.readbyqxmd.com/read/28514521/combining-frozen-density-embedding-with-the-conductor-like-screening-model-using-lagrangian-techniques-for-response-properties
#10
Nils Schieschke, Roberto Di Remigio, Luca Frediani, Johannes Heuser, Sebastian Höfener
We present the explicit derivation of an approach to the multiscale description of molecules in complex environments that combines frozen-density embedding (FDE) with continuum solvation models, in particular the conductor-like screening model (COSMO). FDE provides an explicit atomistic description of molecule-environment interactions at reduced computational cost, while the outer continuum layer accounts for the effect of long-range isotropic electrostatic interactions. Our treatment is based on a variational Lagrangian framework, enabling rigorous derivations of ground- and excited-state response properties...
May 17, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28511056/elimination-of-schistosoma-mansoni-in-infected-mice-by-slow-release-of-artemisone
#11
Daniel Gold, Mohammed Alian, Avraham Domb, Yara Karawani, Maysa Jbarien, Jacques Chollet, Richard K Haynes, Ho Ning Wong, Viola Buchholz, Andreas Greiner, Jacob Golenser
The current treatment of schistosomiasis is based on the anti-helminthic drug praziquantel (PZQ). PZQ affects only the adult stages of schistosomes. In addition, resistance to PZQ is emerging. We suggest a drug, which could serve as a potential alternative or complement to PZQ, and as a means of treating infections at earlier, pre-granuloma stage. Derivatives of the peroxidic antimalarial drug artemisinin have been indicated as alternatives, because both plasmodia and schistosomes are blood-feeding parasites...
May 4, 2017: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/28509536/long-lived-polypyridyl-based-mononuclear-ruthenium-complexes-synthesis-structure-and-azo-dye-decomposition
#12
Koushik Singha, Paltan Laha, Falguni Chandra, Niranjan Dehury, Apurba L Koner, Srikanta Patra
Two mononuclear ruthenium complexes [(bpy)2Ru(II)L1/L2](ClO4)2 ([1](2+)/[2](2+)) (bpy-2,2' bipyridine, L1 = 2,3-di(pyridin-2-yl)pyrazino[2,3-f][1,10]phenanthroline) and L2 = 2,3-di(thiophen-2-yl)pyrazino[2,3-f][1,10]phenanthroline have been synthesized. The complexes have been characterized using various analytical techniques. The complex [1](2+) has further been characterized by its single crystal X-ray structure suggesting ruthenium is coordinating through the N donors of phenanthroline end. Theoretical investigation suggests that the HOMOs of both complexes are composed of pyridine and pyrazine unit of ligands L1 and L2 whereas the LUMOs are formed by the contribution of bipyridine units...
May 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28508648/photoredox-catalyzed-diamidation-and-oxidative-amidation-of-alkenes-solvent-enabled-synthesis-of-1-2-diamides-and-%C3%AE-amino-ketones
#13
Qixue Qin, Yue-Yue Han, Yan-Yan Jiao, Yanyan He, Shouyun Yu
Photoredox-catalyzed difunctionalizations of alkenes with O-acyl hydroxylamine derivatives are described. The solvent tunes the outcome of these reactions. Diamidation and oxidative amidation of alkenes can be achieved in CH3CN and DMSO, respectively. A variety of 1,2-diamidates and α-amino ketones bearing many functional groups are prepared using Ir(ppy)3 as the photocatalyst under visible light irradiation.
May 16, 2017: Organic Letters
https://www.readbyqxmd.com/read/28507950/preparation-and-characterization-of-pistacia-khinjuk-gum-nanoparticles-using-response-surface-method-evaluation-of-its-anti-bacterial-performance-and-cytotoxicity
#14
Ali Fattahi, Tahereh Sakvand, Marziyeh Hajialyani, Behzad Shahbazi, Mohammad Shakiba, Ahmad Tajehmiri, Ebrahim Shakiba
Purpose: This study aims to prepare a novel, natural nanoparticle (NP) as a drug carrier, which also has inherent therapeutic effects. Methods: Pistacia khinjuk gum NPs were prepared and Response surface methodology (RSM) was used for statistical analysis of data and optimizing the size of NPs. Results: NPs were in the range of 75.85-241.3 nm. The optimization study was carried out, and an optimized size (70.86nm) was obtained using DMSO as a solvent. The volume of the organic phase was 111.25µl, and the concentration of gum was 1% w/v...
April 2017: Advanced Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28507671/co-o2-assisted-oxidative-carbon-carbon-and-carbon-heteroatom-bond-cleavage-for-the-synthesis-of-oxosulfonates-from-dmso-and-olefins
#15
Ailong Shao, Meng Gao, Songtao Chen, Tao Wang, Aiwen Lei
Selective carbon-carbon and carbon-heteroatom bond cleavage was achieved in a one reaction system. With this strategy a novel Pd/Cu-catalyzed aerobic oxidative oxosulfonation of olefins with DMSO has been developed. Preliminary mechanistic investigations indicated that CO/O2 assisted the bond cleavage and the leaving groups from the starting materials were trapped by O2 and underwent a hydroxylation process.
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28505606/a-new-azine-derivative-colorimetric-and-fluorescent-dual-channel-probe-for-cyanide-detection
#16
Bin Yu, Chun-Yu Li, Yin-Xia Sun, Hao-Ran Jia, Jian-Qiang Guo, Jing Li
A novel azine derivative colorimetric and fluorescent dual-channel probe salicylaldehyde hydrazine-3,5-dibromosalicylaldehyde (1) has been designed, synthesized and characterized. The probe 1 is confirmed to have especial selectivity and good sensitivity on detecting CN(-) via UV-vis absorption and fluorescence spectrum in aqueous solution (H2O/DMSO, 1:4, v/v). This colorimetric and fluorescent dual-channel probe response to CN(-) owed to the deprotonation process and established the mechanism by using (1)H NMR spectroscopy...
May 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28502854/characterization-of-a-bi-functional-cellulase-produced-by-a-gut-bacterial-resident-of-rosaceae-branch-borer-beetle-osphranteria-coerulescens-coleoptera-cerambycidae
#17
Atousa Hatefi, Ali Makhdoumi, Ahmad Asoodeh, Omid Mirshamsi
A cellulolytic bacterium was obtained from the digestive tract of Osphranteria coerulescens. The breakdown of woody and cellulosic substances by this insect may be relative in part to its symbiont bacteria. Under optimal cultural conditions the novel isolate produced 5.35U/ml cellulase after 72h. The enzyme was purified to 36 fold with a 0.59% yield and showed a specific activity of 9.0U/mg. It presented its maximum activity at 60°C and pH 5, while it was stable in a wide range of temperature from 20 to 60°C and pH from 5 to 10...
May 11, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28499875/natural-zwitterionic-l-carnitine-as-efficient-cryoprotectant-for-solvent-free-cell-cryopreservation
#18
Hongwen Zhai, Jing Yang, Jiamin Zhang, Chao Pan, Nana Cai, Yingnan Zhu, Lei Zhang
Organic solvents, such as dimethyl sulfoxide (DMSO) and glycerol, have been commonly used as cryoprotectants (CPAs) in cell cryopreservation. However, their cytotoxicity and need of complex freezing protocols have impeded their applications especially in clinical cell therapy and regenerative medicine. Trehalose has been explored as a natural CPA to cryopreserve cells, but its poor cell permeability frequently results in low cryopreservation efficacy. In this work, we presented that a natural zwitterionic molecule-l-carnitine-could serve as a promising CPA for solvent-free cryopreservation...
May 9, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28497135/unscrambling-micro-solvation-of-cooh-and-nh-groups-in-neat-dimethyl-sulfoxide-insights-from-1-h-nmr-spectroscopy-and-computational-studies
#19
Panteleimon G Takis, Konstantinos D Papavasileiou, Loukas D Peristeras, Georgios C Boulougouris, Vasilios S Melissas, Anastassios N Troganis
Dimethyl sulfoxide (DMSO) has a significant, multi-faceted role in medicine, pharmacy, and biology as well as in biophysical chemistry and catalysis. Its physical properties and impact on biomolecular structures still attract major scientific interest, especially the interactions of DMSO with biomolecular functional groups. In the present study, we shed light on the "isolated" carboxylic (-COOH) and amide (-NH) interactions in neat DMSO via(1)H NMR studies along with extensive theoretical approaches, i.e. molecular dynamics (MD) simulations, density functional theory (DFT), and ab initio calculations, applied on model compounds (i...
May 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28492624/a-simple-quinolone-schiff-base-containing-chef-based-fluorescence-turn-on-chemosensor-for-distinguishing-zn-2-and-hg-2-with-high-sensitivity-selectivity-and-reversibility
#20
Yuwei Dong, Ruiqing Fan, Wei Chen, Ping Wang, Yulin Yang
A new simple 'dual' chemosensor MQA ((E)-2-methoxy-N-((quinolin-2-yl)methylene)aniline) for distinguishing Zn(2+) and Hg(2+) has been designed, synthesized and characterized. The sensor showed excellent selectivity and sensitivity with a fluorescence enhancement to Zn(2+)/Hg(2+) over other commonly coexisting cations (such as Na(+), Mg(2+), Al(3+), K(+), Mn(2+), Fe(2+), Fe(3+), Co(2+), Ni(2+), Cu(2+), Ga(3+), Cd(2+), In(3+) and Pb(2+)) in DMSO-H2O solution (1/99 v/v), which was reversible with the addition of ethylenediaminetetraacetic acid (EDTA)...
May 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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