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Organic synthesis

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https://www.readbyqxmd.com/read/29151005/synthesis-of-a-novel-polymeric-magnetic-solid-phase-extraction-adsorbent-for-selective-extraction-of-amphetamine-from-urine-samples-coupled-with-high-performance-liquid-chromatography
#1
Arezou Taghvimi, Marjan Ghorbani, Hamed Hamishehkar
A novel pH-responsive block copolymer (Poly ethylene glycol-b-poly (N,N-dimethylaminoethylmethacrylate-co-maleic acid) was designed for the decoration and stabilization of magnetic nanoparticles (MNPs) to apply as an efficient magnetic nano adsorbent for extraction of amphetamine (AM) from biological urine samples to be determined by high performance liquid chromatography ultra violet detector (HPLC-UV). Full characterization of the synthesized Polymeric magnetic nanoparticles (PMNPs) were followed by various techniques like Fourier transform infrared (FT-IR) spectroscopy, powder x-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM)...
November 18, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29150635/one-pot-synthesis-of-trifunctional-chitosan-edta-%C3%AE-cyclodextrin-polymer-for-simultaneous-removal-of-metals-and-organic-micropollutants
#2
Feiping Zhao, Eveliina Repo, Dulin Yin, Li Chen, Simo Kalliola, Juntao Tang, Evgenia Iakovleva, Kam Chiu Tam, Mika Sillanpää
The global contamination of water resources with inorganic and organic micropollutants, such as metals and pharmaceuticals, poses a critical threat to the environment and human health. Herein, we report on a bio-derived chitosan-EDTA-β-cyclodextrin (CS-ED-CD) trifunctional adsorbent fabricated via a facile and green one-pot synthesis method using EDTA as a cross-linker, for the adsorption of toxic metals and organic micropollutants from wastewater. In this system, chitosan chain is considered as the backbone, and the immobilized cyclodextrin cavities capture the organic compounds via host-guest inclusion complexation, while EDTA-groups complex metals...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29150502/hyperthermophilic-carbamate-kinase-stability-and-anabolic-in-vitro-activity-at-alkaline-ph
#3
James E Hennessy, Melissa J Latter, Somayeh Fazelinejad, Amy Philbrook, Daniel M Bartkus, Hye-Kyung Kim, Hideki Onagi, John G Oakeshott, Colin Scott, Apostolos Alissandratos, Christopher J Easton
Carbamate kinases catalyze the conversion of carbamate to carbamoyl phosphate, which is readily transformed into other compounds. Carbamate forms spontaneously from ammonia and carbon dioxide in aqueous solutions, so the kinases have potential for sequestrative utilization of the latter compounds. Here, we compare seven carbamate kinases from mesophilic, thermophilic and hyperthermophilic sources. In addition to the known enzymes from Enterococcus faecalis and Pyrococcus furiosus, the previously unreported enzymes from the hyperthermophiles Thermococcus sibiricus and Thermococcus barophilus, the thermophiles Fervidobacterium nodosum and Thermosipho melanesiensis, and the mesophile Clostridium tetani, were all expressed recombinantly, each in high yield...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29150378/enhanced-antibacterial-effects-of-green-synthesized-zno-nps-using-aristolochia-indica-against-multi-drug-resistant-bacterial-pathogens-from-diabetic-foot-ulcer
#4
Katherin Steffy, G Shanthi, Anson S Maroky, S Selvakumar
BACKGROUND: Increased incidence of Multi-drug resistance in microorganisms has become the greatest challenge in the treatment of Diabetic Foot Ulcer (DFU) and urges the need of a new antimicrobial agent. In this study, we determined the bactericidal effects of ZnO nanoparticles (ZnO NPs) green synthesized from Aristolochia indica against Multi-drug Resistant Organisms (MDROs) isolated from pus samples of DFU patients attending in a tertiary care hospital in South India. METHODS: ZnO NPs were characterized by UV-vis-DRS spectroscopy, Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM) and for its zeta potential value...
November 14, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/29150150/biocompatible-hollow-polymeric-particles-produced-by-a-mild-solvent-and-template-free-strategy
#5
Eustolia Rodríguez-Velázquez, Pablo Taboada, Manuel Alatorre-Meda
Macroscopic hollow polymeric particles are attractive materials for various applications such as surgery, food industry, agriculture, etc. However, protocols reporting their synthesis have hitherto made use of organic solvents and/or sacrificial templates, compromising the encapsulation of different bioactive compounds and the process yield. Here, millimeter-size, hollow polymeric particles were synthesized, for the first time, in a solvent- and template free manner onto superhydrophobic surfaces (SHS). The particles were produced upon assembly and double superficial crosslinking of liquid droplets of DNA and methacrylamide chitosan aqueous solutions (CH:MA), leading to liquid-core particles with a hardened hydrogel shell...
November 14, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29150138/new-hybrid-adsorbent-based-on-porphyrin-functionalized-silica-for-heavy-metals-removal-synthesis-characterization-isotherms-kinetics-and-thermodynamics-studies
#6
Smaail Radi, Chahrazad El Abiad, Nuno M M Moura, Maria A F Faustino, M Graça P M S Neves
The pollution of water resources due to the disposal of toxic heavy metals has been a growing global concern for the last decades. For this purpose, the search for effective and economic material based adsorbents is required, due to the efficiency of the process. In this work, a novel inorganic-organic hybrid material based on silica chemically modified with a porphyrin (SiNTPP), with a high metal removal efficiency, was developed. The new material was characterized using a set of suitable techniques such as (13)C NMR of the solid state, elemental analysis, FTIR, nitrogen adsorption-desorption isotherm, BET surface area, BJH pore sizes and scanning electron microscopy (SEM)...
November 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29149836/are-there-different-kinds-of-aging
#7
Amalia Gabriela Diaconeasa
A critical analysis of the accelerated aging syndromes may explain what aging is, but also why some tissues and organs age at accelerated rates in comparison with aging rates of other tissues. Syndromes of accelerated aging are caused by mutations affecting the integrity of the genetic material. Among them, the most studied is Werner's syndrome, "adult progeria", caused by a recessive autosomal mutation with a frequency of 1 in 10 millions, which affects a helicase involved in DNA repair. In Werner syndrome, there is a loss of heterochromatin, though the stability of heterochromatin is also affected in "normal" aging...
November 16, 2017: Current Aging Science
https://www.readbyqxmd.com/read/29149540/controllable-synthesis-of-organic-microcrystals-with-tunable-emission-color-and-morphology-based-on-molecular-packing-mode
#8
Zhi-Zhou Li, Liang-Sheng Liao, Xue-Dong Wang
Organic microcrystals are of essential importance for high fluorescence efficiency, ordered molecular packing mode, minimized defects, and smooth shapes, which are extensively applied in organic optoelectronics. The molecular packing mode significantly influences the optical/electrical properties of organic microcrystals, which makes the controllable preparation of organic microcrystals with desired molecular packing mode extremely important. In the study, yellow-emissive α phase organic microcrystals with rectangular morphology and green-emissive β phase perylene microcrystals with rhombic morphology are separately prepared by simply controlling the solution concentration...
November 17, 2017: Small
https://www.readbyqxmd.com/read/29149531/solution-adsorption-formation-of-a-%C3%AF-conjugated-polymer-graphene-composite-for-high-performance-field-effect-transistors
#9
Yun Liu, Wei Hao, Huiying Yao, Shuzhou Li, Yuchen Wu, Jia Zhu, Lei Jiang
Semiconducting polymers with π-conjugated electronic structures have potential application in the large-scale printable fabrication of high-performance electronic and optoelectronic devices. However, owing to their poor environmental stability and high-cost synthesis, polymer semiconductors possess limited device implementation. Here, an approach for constructing a π-conjugated polymer/graphene composite material to circumvent these limitations is provided, and then this material is patterned into 1D arrays...
November 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29148783/in-situ-assembly-of-nanoparticles-into-hierarchical-beta-zeolite-with-tailored-simple-organic-molecule
#10
Kai Zhang, Zewei Liu, Xin Yan, Xuelong Hao, Min Wang, Chao Li, Hongxia Xi
A hierarchically structured beta zeolite with intercrystalline mesopores was successfully synthesized via in situ assembly of nanoparticles by employing a simple organic molecule N2-p-N2, tailored form polyquaternium surfactant, with no hydrophobic long chain. The obtained material was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), nitrogen adsorption/desorption isotherms and computer simulation. These results indicated that the tailored template molecule N2-p-N2 without hydrophobic long chain tail still can direct the zeolite crystallization, the hydrophobic long chain tail is not necessary during the mesoporous Beta zeolite formation...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148721/ratiometric-fluorescence-sensing-and-real-time-detection-of-wa-ter-in-organic-solvents-with-one-pot-synthesis-of-ru-mil-101-al-nh2
#11
Hua-Qing Yin, Jichun Yang, Xue-Bo Yin
Ratiometric fluorescence detection attracts much attention because of its decreased environment influence and easy-to-differentiate color and intensity change. Herein, a guest-encapsulation metal organic framework (MOF), Ru@MIL-NH2, is prepared with 2-aminoterephthalic acid, AlCl3, and Ru(bpy)32+ by simple one-pot method for ratiometric fluorescence sensing of water in organic solvents. The rational selection of excitation wavelength provides dual emission at 465 and 615 nm from Ru@MIL-NH2 under single excitation of 300 nm...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29148566/factors-that-influence-the-provision-of-intrapartum-and-postnatal-care-by-skilled-birth-attendants-in-low-and-middle-income-countries-a-qualitative-evidence-synthesis
#12
REVIEW
Susan Munabi-Babigumira, Claire Glenton, Simon Lewin, Atle Fretheim, Harriet Nabudere
BACKGROUND: In many low- and middle-income countries women are encouraged to give birth in clinics and hospitals so that they can receive care from skilled birth attendants. A skilled birth attendant (SBA) is a health worker such as a midwife, doctor, or nurse who is trained to manage normal pregnancy and childbirth. (S)he is also trained to identify, manage, and refer any health problems that arise for mother and baby. The skills, attitudes and behaviour of SBAs, and the extent to which they work in an enabling working environment, impact on the quality of care provided...
November 17, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29147758/a-systematic-review-assessing-non-pharmacological-conservative-treatment-studies-for-people-with-non-inflammatory-multi-joint-pain-clinical-outcomes-and-research-design-considerations
#13
REVIEW
C Comer, T O Smith, B Drew, R Raja, S R Kingsbury, Philip G Conaghan
To systematically review the evidence to determine the clinical outcomes and the important methodological quality features of interventional studies on adults with non-inflammatory multi-joint pain (MJP). Systematic search of published and unpublished literature using the databases: AMED, CINAHL, MEDLINE, EMBASE, psycINFO, SPORTDiscus, PEDro, OpenGrey, the EU Clinical Trials Register, World Health Organization International Clinical Trial Registry Platform, ClinicalTrials.gov and the ISRCTN registry (search: inception to 19th October 2017)...
November 16, 2017: Rheumatology International
https://www.readbyqxmd.com/read/29147706/amine-assisted-top-down-delamination-of-the-two-dimensional-metal-organic-framework-cu2-bdc-2
#14
Christel Kutzscher, André Gelbert, Sebastian Ehrling, Claudia Schenk, Irena Senkovska, Stefan Kaskel
A chemically assisted top-down method for the synthesis of MOF-nanoplates was developed applying amine based delamination agents. Applied on a well described model structure, the layered MOF Cu2(bdc)2(DMF)2 (bdc - 1,4-benzenedicarboxylate), two different strategies of amine assisted delamination turned out to be successful to obtain nanoplates. Particles with thicknesses of around 70 nm were obtained by direct delamination of crystals using octylamine. The surfactant (polyvinylpyrrolidone) assisted synthesis combined with a post-synthetic amine delamination step enabled a further reduction of the thickness of the MOF nanoplates down to 4-14 nm...
November 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29147530/programmed-serial-stereochemical-relay-and-its-application-in-the-synthesis-of-morphinans
#15
Kun Ho Kenny Park, Rui Chen, David Y-K Chen
Herein we report a rationally designed, serial point-to-axial and axial-to-point stereoinduction and its integration into multi-step and target-oriented organic synthesis. In this proof-of-concept study, the configurational stability of several carefully designed atropisomeric intermediates and the fidelity of their unconventional stereoinductions were systematically investigated. The highly functionalized prepared synthetic intermediate was further applied in a novel chemical method to access the morphinans and it is potentially applicable to other structurally related alkaloids...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29146968/heterologous-expression-and-characterization-of-a-new-lipase-from-pseudomonas-fluorescens-pf0-1-and-used-for-biodiesel-production
#16
Wu Liu, Menggang Li, Yunjun Yan
As a kind of important biocatalysts, Pseudomonas lipases are commonly applied in various industrial fields. Pflip1, a new extracellular lipase gene from Pseudomonas. fluorescens Pf0-1, was first cloned and respectively expressed in Escherichia coli BL21(DE3) and Pichia pastoris KM71, the recombinant proteins Pflip1a and Pflip1b were later purified separately. Then Pflip1a was further characterized. The optimum pH of Pflip1a was 8.0 and its optimal temperature was 70 °C. After incubation at 70 °C for 12 h, Pflip1a could retain over 95% of its original activity...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146667/building-better-bridges-into-stem-a-synthesis-of-25-years-of-literature-on-stem-summer-bridge-programs
#17
Michael Ashley, Katelyn M Cooper, Jacqueline M Cala, Sara E Brownell
Summer bridge programs are designed to help transition students into the college learning environment. Increasingly, bridge programs are being developed in science, technology, engineering, and mathematics (STEM) disciplines because of the rigorous content and lower student persistence in college STEM compared with other disciplines. However, to our knowledge, a comprehensive review of STEM summer bridge programs does not exist. To provide a resource for bridge program developers, we conducted a systematic review of the literature on STEM summer bridge programs...
2017: CBE Life Sciences Education
https://www.readbyqxmd.com/read/29144523/protein-templated-gold-nanoparticle-synthesis-protein-organization-controlled-gold-sequestration-and-unexpected-reaction-products
#18
Cassidy Hart, Nouf Abuladel, Madeleine Bee, Megan C Kreider, Alexander C CVitan, Moira M Esson, Andrew Farag, Trisha Ibeh, Eleni N Kalivas, Daniel-Mario Larco, Andrew Walker Long, Loukas Lymperopoulos, Zachary Mendel, Nancy Miles, Carly M Zareba, James C Schwabacher, Helen Slucher, Javier Vinals, John M Heddleston, Wenyue Li, Douglas M Fox, Matthew R Hartings
Emerging applications that exploit the properties of nanoparticles for biotechnology require that the nanoparticles be biocompatible or support biological recognition. These types of particles can be produced through syntheses that involve biologically relevant molecules (proteins or natural extracts, for example). Many of the protocols that rely on these molecules are performed without a clear understanding of the mechanism by which the materials are produced. We have investigated a previously described reaction in which gold nanoparticles are produced from the reaction of chloroauric acid and proteins in solution...
November 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29143778/the-forty-sixth-euro-congress-on-drug-synthesis-and-analysis-snapshot-%C3%A2
#19
Pavel Mucaji, Atanas G Atanasov, Andrzej Bak, Violetta Kozik, Karolina Sieron, Mark Olsen, Weidong Pan, Yazhou Liu, Shengchao Hu, Junjie Lan, Norbert Haider, Robert Musiol, Jan Vanco, Marc Diederich, Seungwon Ji, Jan Zitko, Dongdong Wang, Danica Agbaba, Katarina Nikolic, Slavica Oljacic, Jelica Vucicevic, Daniela Jezova, Anna Tsantili-Kakoulidou, Fotios Tsopelas, Constantinos Giaginis, Teresa Kowalska, Mieczyslaw Sajewicz, Jerzy Silberring, Przemyslaw Mielczarek, Marek Smoluch, Izabela Jendrzejewska, Jaroslaw Polanski, Josef Jampilek
The 46th EuroCongress on Drug Synthesis and Analysis (ECDSA-2017) was arranged within the celebration of the 65th Anniversary of the Faculty of Pharmacy at Comenius University in Bratislava, Slovakia from 5-8 September 2017 to get together specialists in medicinal chemistry, organic synthesis, pharmaceutical analysis, screening of bioactive compounds, pharmacology and drug formulations; promote the exchange of scientific results, methods and ideas; and encourage cooperation between researchers from all over the world...
October 28, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29143473/recent-advancements-of-rylene-imide-dyes-synthesis-and-application-as-organic-semiconducting-materials
#20
Jiajing Feng, Wei Jiang, Zhaohui Wang
Rylene imide dyes have been among the most promising organic semiconducting materials for several years due to their remarkable optoelectronic properties and high chemical/thermal persistency. In the past decades, various spendid rylene imide dyes have been developed for optoelectronic devices, such as organic solar cells (OSCs) and organic field-effect transistors (OFETs). Recently, tremendous progress of perylene diimides (PDIs) and the analogues used in OSCs has been witnessed attributed to their ease of functionalization...
November 16, 2017: Chemistry, An Asian Journal
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