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https://www.readbyqxmd.com/read/28927005/mediatorless-impedance-studies-with-titanium-dioxide-conjugated-gold-nanoparticles-for-hydrogen-peroxide-detection
#1
Nur Hamidah Abdul Halim, Yook Heng Lee, Radha Swathe Priya Malon Marugan, Uda Hashim
An impedimetric-based biosensor constructed using gold nanoparticles (AuNP) entrapped within titanium dioxide (TiO₂) particles for hydrogen peroxide (H₂O₂) detection is the main feature of this research. The matrix of the biosensor employed the surface of TiO₂, which was previously modified with an amine terminal group using 3-Aminopropyltriethoxysilane (APTS) at a low temperature to create a ready to immobilise surface for the biosensor application. Hemoglobin (Hb), which exhibits peroxidase-like activity, was used as the bioreceptor in the biosensor to detect H₂O₂ in solution...
September 18, 2017: Biosensors
https://www.readbyqxmd.com/read/28926767/stabilization-of-t4-bacteriophage-at-acidic-and-basic-ph-by-adsorption-on-paper
#2
Abigail Meyer, Melissa Greene, Chad Kimmelshue, Rebecca Cademartiri
Bacteriophages find applications in agriculture, medicine, and food safety. Many of these applications can expose bacteriophages to stresses that inactivate them including acidic and basic pH. Bacteriophages can be stabilized against these stresses by materials including paper, a common material in packaging and consumer products. Combining paper and bacteriophages creates antibacterial materials, which can reduce the use of antibiotics. Here we show that adsorption on paper protects T4, T5, and T7 bacteriophage from acidic and basic pH...
September 5, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28926724/in-situ-grafting-to-improve-polarity-of-polyacrylonitrile-hollow-fiber-supported-polydimethylsiloxane-membranes-for-co2-separation
#3
Leiqing Hu, Jun Cheng, Yannan Li, Jianzhong Liu, Junhu Zhou, Kefa Cen
Surface grafting modification was proposed to improve the surface polarity of polyacrylonitrile hollow fiber-supported polydimethylsiloxane (PDMS) membrane. The initiator 3-aminopropyltriethoxysilane containing one amine group was integrated into PDMS, and polyvinyl pyrrolidone (PVP) with strong polarity was connected to the surface by reacting with amine groups. Surface grafting modification was proven on X-ray photoelectron spectroscopy. The sharp decrease (from ∼98° to ∼28°) in water contact angle of the PDMS membrane indicated the significant improvement in surface polarity after the modification...
September 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28926682/development-of-a-simple-and-valid-method-for-the-trace-determination-of-phthalate-esters-in-human-plasma-using-dispersive-liquid-liquid-microextraction-coupled-with-gc-ms
#4
Karim Ebrahim, Parinaz Poursafa, Mohammad Mehdi Amin
A new method was developed for the trace determination of phthalic acid esters in plasma using dispersive liquid-liquid microextraction and gas chromatography with mass spectrometry analysis. Plasma proteins were efficiently precipitated by trichloroacetic acid and then a mixture of chlorobenzene (as extraction solvent) and acetonitrile (as dispersive solvent) rapidly injected to clear supernatant using a syringe. After the centrifuging, chlorobenzene were sedimented in the bottom of the test tube. 1 μL of this sedimented phase was injected into the gas chromatograph for phthalic acid esters analysis...
September 19, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28926274/nh2-directed-c-h-alkenylation-of-2-vinylanilines-with-vinylbenziodoxolones
#5
Andreas Boelke, Lucien D Caspers, Boris J Nachtsheim
The first directing-group-mediated C-H alkenylation with alkenyl-λ(3)-iodanes as electrophilic alkene-transfer reagents has been developed. The application of free aromatic amines as challenging but synthetically valuable directing groups in combination with an Ir(III) catalyst enabled the synthesis of highly desirable 1,3-dienes in excellent yields of up to 98% with high to perfect (Z,E) stereoselectivity. A broad substrate scope and further synthetic modifications are demonstrated.
September 19, 2017: Organic Letters
https://www.readbyqxmd.com/read/28926233/copper-i-catalyzed-regio-and-stereoselective-intramolecular-alkylboration-of-propargyl-ethers-and-amines
#6
Hiroaki Iwamoto, Yu Ozawa, Koji Kubota, Hajime Ito
The copper(I)-catalyzed regio- and stereoselective intramolecular alkylation of propargyl ethers and amines bearing an alkyl electrophilic moiety has been developed. The reaction showed high functional group tolerance and gave highly functionalized alkenylboronates bearing heterocyclic rings, which are versatile synthetic intermediates in organic chemistry. The borylation products can be transformed into multi-substituted alkenes through stereospecific transformations. Mechanistic studies showed that the chemo- and stereoselectivity of copper(I)-catalyzed borylation depends on the type of leaving group...
September 19, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28926222/degradation-of-paraoxon-and-the-chemical-warfare-agents-vx-tabun-and-soman-by-the-metal-organic-frameworks-uio-66-nh2-mof-808-nu-1000-and-pcn-777
#7
Martijn C de Koning, Marco van Grol, Troy Breijaert
In recent years, Zr-based metal-organic frameworks (MOFs) have been developed that facilitate catalytic degradation of toxic organophosphate agents, such as chemical warfare agents (CWAs). Because of strict regulations, experiments using live agents are not possible for most laboratories and, as a result, simulants are used in the majority of cases. Reports that employ real CWAs are scarce and do not cover the whole spectrum of agents. We here present a comparative study in which UiO-66-NH2, NU-1000, MOF-808, and PCN-777 are evaluated for their effectiveness in the degradation of paraoxon and the chemical warfare agents tabun, VX, and soman, in N-ethylmorpholine buffer (pH 10) as well as in pure water...
September 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28926206/asymmetric-total-syntheses-of-communesin-f-and-a-putative-member-of-the-communesin-family
#8
David Yu-Kai Chen
Here we report asymmetric total syntheses of communesin F and a putative member of the communesin family of bis-aminal alkaloid natural products. The successful strategy featured the invention of an asymmetric organocatalytic reaction to unify two oxindole subunits, a Ti(OiPr)4-mediated dehydrative skeletal rearrangement, and a late-stage Pd(OAc)2-catalyzed directed CH-alkenylation reaction. Collectively, the synthetic technologies disclosed herein enabled the preparation of a late-stage polycyclic intermediate catered for the synthesis of both naturally occurring and designed communesins...
September 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28926128/copper-catalysed-aminoboration-of-vinylarenes-with-hydroxylamine-esters-a-computational-mechanistic-study
#9
Sven Tobisch
This first comprehensive computational study of the copper-mediated formal aminoboration utilising an electrophilic strategy has identified the most accessible pathway for the productive catalysis. The mechanistic picture derived from smooth energy profiles acquired by employing a reliable computational protocol applied to a realistic catalyst model conforms to all available experimental data. The high degree of chemo- and stereoselectivity achieved in syn-borylcupration and Umpolung electrophilic amination is instrumental to the exclusive generation of the (syn)-beta-aminoalkylborane product...
September 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28926067/3-aminoperylene-and-ascorbate-in-aqueous-sds-one-green-laser-flash-%C3%A2-and-action-sustainably-detoxifying-a-recalcitrant-chloro-organic
#10
Tim Kohlmann, Robert Naumann, Christoph Kerzig, Martin Goez
The hydrated electron represents a "super-reductant" in water, providing 2.9 eV of reductive power, which suffices to decompose nonactivated aliphatic halides. We show that 3-amino-perylene in SDS micelles, when combined with the bioavailable ascorbate as an extramicellar sacrificial donor, sustainably produces hydrated electrons through photoredox catalysis with green light, from a metal-free system, and at near-physiological pH. Photoionization of the amine with a 532 nm laser yields an extremely long-lived radical cation as the by-product, and a subsequent reaction of the latter with the sacrificial donor across the micelle/water interface regenerates the catalyst...
September 19, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28926053/catalytic-domino-amination-and-oxidative-coupling-of-gold-acetylides-and-isolation-of-key-vinylene-digold-intermediates-as-a-new-class-of-ditopic-n-heterocyclic-carbene-complexes
#11
Haifeng Chen, Jiwei Wang, Zejun Hu, Sheng Xu, Min Shi, Jun Zhang
A catalytic domino amination and oxidative coupling of in situ prepared gold acetylides has been developed for the synthesis of abnormal NHC (aNHC) gold complexes, and key vinylene digold intermediates are isolated and structurally characterized.
September 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28925304/antibacterial-antioxidant-and-cytotoxic-activities-of-triterpenes-and-flavonoids-from-the-aerial-parts-of-salvia-barrelieri-etl
#12
Meryem Lehbili, Abdulmagid Alabdul Magid, Ahmed Kabouche, Laurence Voutquenne-Nazabadioko, Amin Abedini, Hamid Morjani, Sophie C Gangloff, Zahia Kabouche
From the aerial parts of Salvia barrelieri Etl. (Lamiaceae), 12 compounds including a new triterpene, 3β-acetoxy-olean-18-ene-2α-ol, were isolated. Their structures were established by the combination analyses of spectroscopy including 1D-, 2D-NMR and HRESIMS and in comparison with the reported data in the literature. The antibacterial activity of these compounds was evaluated by bioautography on Staphylococcus aureus followed by the determination of MIC values by serial dilution technique against five bacteria...
September 19, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28923468/immune-regulation-by-histamine-and-histamine-secreting-bacteria
#13
REVIEW
Weronika Barcik, Marcin Wawrzyniak, Cezmi A Akdis, Liam O'Mahony
Histamine is a biogenic amine with extensive effects on many immune cell types. Histamine and its four receptors (H1R-H4R) represent a complex system of immunoregulation with distinct effects dependent on receptor subtypes and their differential expression. In addition to mammalian cells, bacteria can also secrete histamine and the influence of microbiota-derived histamine on host immunological processes is only beginning to be described. However, it is clear that histamine-secreting microbes are present within the human gut microbiota and their levels are increased in asthma patients...
September 15, 2017: Current Opinion in Immunology
https://www.readbyqxmd.com/read/28922924/improving-the-stability-of-amino-containing-plasma-polymer-films-in-aqueous-environments
#14
Johanna Dorst, Marianne Vandenbossche, Martin Amberg, Laetitia Bernard, Patrick Rupper, Klaus-Dieter Weltmann, Katja Fricke, Dirk Hegemann
Plasma polymer films that contain amine groups (NH2-PPFs) are known to degrade over time, particularly in aqueous environments. To reduce such aging effects, a vertical chemical gradient regarding the amine group density was explored ranging over a few nanometers at the coating surface. The gradient-containing nanofilms were formed in low pressure plasma by tuning plasma conditions while keeping the plasma "switched on". The coating process started with a more cross-linked NH2-PPF (70 W, NH3/C2H4 4:7), followed by the deposition of a few nanometers of a less cross-linked yet more functional NH2-PPF (50 W, NH3/C2H4 7:7)...
September 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28922913/regioselective-and-direct-azidation-of-anilines-via-cu-ii-catalyzed-c-h-functionalization-in-water
#15
Hongli Fang, Yandong Dou, Jingyan Ge, Mohit Chhabra, Hongyan Sun, Pengfei Zhang, Yu-Guo Zheng, Qing Zhu
We report herein the first example of Cu(II)-catalyzed site selective azidation of aromatic amines via C-H functionalization in aqueous media. In our strategy, mild reagent was utilized. H2O2 served as the oxidant, and sodium azide was used as the azidation reagent. This method could also be applied to late-stage functionalization of drugs that possess aromatic amine moiety. In addition, we found that bromination or iodination on the ortho-position of aromatic amines could occur efficiently using this catalytic system...
September 19, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28922725/ameliorative-impact-of-morus-alba-leaves-aqueous-extract-against-embryonic-ophthalmic-tissue-malformation-in-streptozotocin-induced-diabetic-rats
#16
Adel M A Assiri, Mohamed E El-Beeh, Ali H Amin, Mohamed Fawzy Ramadan
BACKGROUND: Diabetes mellitus (DM) is becoming a serious threat to human health. Morus alba var. multicaulis (Perr.) Loudon (Moraceae) showed a bright future in DM therapy. OBJECTIVE: The study evaluates the antioxidant activity of Morus alba leaves aqueous extract (MLAE) and antidiabetic properties of MLAE in streptozotocin-induced diabetic rats focusing on the ameliorative effects against embryogenesis defects. MATERIALS AND METHODS: MLAE was assayed for bioactive compounds, and antiradical potential...
September 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28922405/assessment-on-induced-genetic-variability-and-divergence-in-the-mutagenized-lentil-populations-of-microsperma-and-macrosperma-cultivars-developed-using-physical-and-chemical-mutagenesis
#17
Rafiul Amin Laskar, Samiullah Khan
Induced mutagenesis was employed to create genetic variation in the lentil cultivars for yield improvement. The assessments were made on genetic variability, character association, and genetic divergence among the twelve mutagenized populations and one parent population of each of the two lentil cultivars, developed by single and combination treatments with gamma rays and hydrazine hydrates. Analysis of variance revealed significant inter-population differences for the observed quantitative phenotypic traits...
2017: PloS One
https://www.readbyqxmd.com/read/28922260/increased-risk-of-inflammatory-bowel-disease-in-a-population-based-cohort-study-of-patients-with-hirschsprung-disease
#18
Anna Löf Granström, Leila Amin, Henrik Arnell, Tomas Wester
OBJECTIVES: Hirschsprung disease (HSCR) has previously been associated with inflammatory bowel disease (IBD). There are no data to show how common this association is. The aim of this study was to assess the risk of IBD in individuals with HSCR in a population-based cohort. METHODS: This was a nationwide, population-based cohort study. The study exposure was HSCR and the study outcome was IBD. The cohort included all individuals with HSCR registered in the Swedish National Patient Register between 1964-2013 and ten age- and sex-matched controls per patient, randomly selected from the Swedish Population Register...
September 16, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28921981/the-use-of-cyclopentadienone-iron-tricarbonyl-complexes-for-c-n-bond-formation-reactions-between-amines-and-alcohols
#19
Thomas J Brown, Madeleine Cumbes, Louis J Diorazio, Guy J Clarkson, Martin Wills
The application of a series of (cyclopentadienone)iron tricarbonyl complexes to 'borrowing hydrogen' reactions between amines and alcohols was completed in order to assess their catalytic activity. The electronic variation of the aromatic groups flanking the C=O of the cyclopentadienone influenced the efficiency of the reactions, however in other cases the Knölker catalyst 1, containing trimethylsilyl groups flanking the cyclopentadienone ketone, gave the best results. In some cases, the change of the ratio of amine to alcohol improves the conversion significantly...
September 18, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28921433/large-scale-transient-transfection-of-suspension-mammalian-cells-for-vlp-production
#20
Laura Cervera, Amine A Kamen
Large-scale transient transfection of mammalian cell suspension cultures enables the production of biological products in sufficient quantity and under stringent quality attributes to perform accelerated in vitro evaluations and has the potential to support preclinical or even clinical studies. Here we describe the methodology to produce VLPs in a 3L bioreactor, using suspension HEK 293 cells and PEIPro as a transfection reagent. Cells are grown in the bioreactor to 1 × 10(6) cells/mL and transfected with a plasmid DNA-PEI complex at a ratio of 1:2...
2018: Methods in Molecular Biology
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