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https://www.readbyqxmd.com/read/29785431/slow-magnetic-relaxation-and-luminescence-properties-in-lanthanide-iii-anil-complexes
#1
Diamantoula Maniaki, Ioannis Mylonas-Margaritis, Julia Mayans, Aikaterini Savvidou, Catherine P Raptopoulou, Vlasoula Bekiari, Vassilis Psycharis, Albert Escuer, Spyros P Perlepes
The initial use of anils, i.e. bidentate Schiff bases derived from the condensation of anilines with salicylaldehyde or its derivatives, in 4f-metal chemistry is described. The 1 : 1 reactions between Ln(NO3)3·xH2O (Ln = lanthanide) or Y(NO3)3·6H2O and N-(5-bromosalicylidene)aniline (5BrsalanH) in MeCN has provided access to complexes [Ln(NO3)3(5BrsalanH)2(H2O)]·MeCN (Ln = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb) and [Y(NO3)3(5BrsalanH)2(H2O)]·MeCN, respectively, in good yields. The structures of the isomorphous complexes with Ln = Pr(1·MeCN), Sm(3·MeCN), Gd(5·MeCN), Dy(7·MeCN) and Er(9·MeCN) have been determined by single-crystal X-ray crystallography...
May 22, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29785057/computational-redesign-of-enzymes-for-regio-and-enantioselective-hydroamination
#2
Ruifeng Li, Hein J Wijma, Lu Song, Yinglu Cui, Marleen Otzen, Yu'e Tian, Jiawei Du, Tao Li, Dingding Niu, Yanchun Chen, Jing Feng, Jian Han, Hao Chen, Yong Tao, Dick B Janssen, Bian Wu
Introduction of innovative biocatalytic processes offers great promise for applications in green chemistry. However, owing to limited catalytic performance, the enzymes harvested from nature's biodiversity often need to be improved for their desired functions by time-consuming iterative rounds of laboratory evolution. Here we describe the use of structure-based computational enzyme design to convert Bacillus sp. YM55-1 aspartase, an enzyme with a very narrow substrate scope, to a set of complementary hydroamination biocatalysts...
May 21, 2018: Nature Chemical Biology
https://www.readbyqxmd.com/read/29784338/ionic-liquids-as-signal-amplifiers-for-the-simultaneous-extraction-of-several-neurotransmitters-determined-by-micellar-electrokinetic-chromatography
#3
Natalia Miękus, Ilona Olędzka, Natalia Kossakowska, Alina Plenis, Piotr Kowalski, Adam Prahl, Tomasz Bączek
Nowadays, ionic liquids (ILs) are receiving more attention in various fields of analytical chemistry. Their contribution to the enhancement of the clean-up, extraction, separation and determination of trace amounts of various biologically important compounds in distinct matrices is well documented. Moreover, their importance as "green chemistry" solvents has been pointed out. Advanced analytical methods based on the IL-assisted microextraction and electrophoretic determination of minute concentrations of neurotransmitters (NTs) in samples are presented here for the first time...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29780998/the-synergistic-effect-of-self-assembly-and-visible-light-induced-the-oxidative-c-h-acylation-of-n-heterocyclic-aromatic-compounds-with-aldehydes
#4
Lingling Zhang, Guoting Zhang, Yongli Li, Shengchun Wang, Aiwen Lei
Constructing carbon-carbon bonds through oxidative cross-coupling between two hydrocarbon compounds is regarded as a foundational issue in green chemistry. High atom-economy and mild conditions are long term pursued goals in this field. Herein, we developed a visible-light mediated direct cross-coupling between N-heterocycles and aldehydes without the requirement of a photocatalyst. Several N-heterocycles afforded the acylation products with aromatic or aliphatic aldehydes in good yields. The reaction can be conducted under room temperature and easily scaled up...
May 21, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29776457/a-new-green-method-for-the-quantitative-analysis-of-enrofloxacin-by-fourier-transform-infrared-spectroscopy
#5
Camila Tavares Rebouças, Ana Carolina Kogawa, Hérida Regina Nunes Salgado
Background: A green analytical chemistry method was developed for quantification of enrofloxacin in tablets. The drug, a second-generation fluoroquinolone, was first introduced in veterinary medicine for the treatment of various bacterial species. Objective: This study proposed to develop, validate, and apply a reliable, low-cost, fast, and simple IR spectroscopy method for quantitative routine determination of enrofloxacin in tablets. Methods: The method was completely validated according to the International Conference on Harmonisation guidelines, showing accuracy, precision, selectivity, robustness, and linearity...
May 18, 2018: Journal of AOAC International
https://www.readbyqxmd.com/read/29775709/use-of-green-chemistry-methods-in-the-extraction-of-dietary-fibers-from-cactus-rackets-opuntia-ficus-indica-structural-and-microstructural-studies
#6
Marwa Cheikh Rouhou, Souhir Abdelmoumen, Sabu Thomas, Hamadi Attia, Dorra Ghorbel
This work aims to compare the development of three green chemistry methods in the extraction of cactus (Opuntia ficus indica) dietary fibers. The influence of extraction conditions (solvent nature: water, lemon juice and ethanol; extraction process: maceration and steam explosion; extraction time: 30 min, 1 h, 3 h, 5 h) on the chemical and structural composition was studied. Fourier Transform Infrared (FTIR) spectroscopy proved that all treatments do not affect the cellulose structure and could induce the reduction of hemicelluloses and lignin content...
May 15, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29774902/pet-raft-polymerisation-towards-green-and-precision-polymer-manufacturing
#7
Jamie Phommalysack-Lovan, Yingying Chu, Cyrille Boyer, Jiangtao Xu
The necessity of sustainable development in the chemical industry has continuously drawn attention to find safe, environmentally friendly and atom-economic chemical processes, which is defined in the 12 principles of green chemistry. Merging photoredox catalysis and reversible addition-fragmentation chain transfer (RAFT) polymerisation, the photoinduced electron/energy transfer (PET)-RAFT process has opened up a new way of performing reversible deactivation radical polymerisation for well-defined polymer synthesis using light as an external stimulus...
May 18, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29774651/visible-light-induced-organic-photochemical-reactions-via-energy-transfer-pathways
#8
Wen-Jing Xiao, Quan-Quan Zhou, You-Quan Zou, Liang-Qiu Lu
Visible-light photocatalysis is a rapidly developing and powerful strategy to initiate organic transformations as it closely adheres to the tenants of green and sustainable chemistry. Generally, most visible-light-induced photochemical reactions occur through single-electron transfer (SET) pathways. Recently, visible-light-induced energy transfer (EnT) reactions have received considerable attentions from the synthetic community as this strategy provides a distinct reaction pathway, and remarkable achievements have been made in this field...
May 18, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29772170/supramolecularly-engineered-circular-bivalent-aptamer-for-enhanced-functional-protein-delivery
#9
Ying Jiang, Xiaoshu Pan, Jin Chang, Weijia Niu, Weijia Hou, Hailan Kuai, Zilong Zhao, Ji Liu, Ming Wang, Weihong Tan
Circular bivalent aptamers (cb-apt) comprise an emerging class of chemically engineered aptamers with substantially improved stability and molecular recognition ability. Its therapeutic application, however, is challenged by the lack of functional modules to control the interactions of cb-apt with therapeutics. We present the design of a β-cyclodextrin-modified cb-apt (cb-apt-βCD) and its supramolecular interaction with molecular therapeutics via host-guest chemistry for targeted intracellular delivery. The supramolecular ensemble exhibits high serum stability and enhanced intracellular delivery efficiency compared to a monomeric aptamer...
May 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29768479/construction-of-a-tri-chromatic-reporter-cell-line-for-the-rapid-and-simple-screening-of-splice-switching-oligonucleotides-targeting-dmd-exon-51-using-high-content-screening
#10
Takenori Shimo, Keisuke Tachibana, Satoshi Obika
Splice-switching oligonucleotides (SSOs) that can modulate RNA splicing are used for the treatment of many genetic disorders. To enhance the efficacy of modulating splicing, it is important to optimize SSOs with regard to target sites, GC content, melting temperature (Tm value), chemistries, and lengths. Thus, in vitro assay systems that allow for the rapid and simple screening of SSOs are essential for optimizing SSO design. In this study, we established a novel tri-chromatic reporter cell line for SSO screening...
2018: PloS One
https://www.readbyqxmd.com/read/29768238/one-pot-green-fabrication-of-metallic-silver-nanoscale-materials-using-crescentia-cujete-l-and-assessment-of-their-bactericidal-activity
#11
Seetharaman Prabukumar, Chandrasekaran Rajkuberan, Gnanasekar Sathishkumar, Mani Illaiyaraja, Sivaperumal Sivaramakrishnan
In this study, the leaf extract of an important medicinal plant Crescentia cujete L. (CC) was employed as a green reducing agent to synthesise highly-stable C. cujete silver nanoparticles (CCAgNPs). The reduction of Ag+ to Ag0 nanoparticles was initially observed by a colour change which generates an intense surface plasmon resonance peak at 417 nm using a UV-Vis spectrophotometer. Various optimisation factors such as temperature, pH, time and the stoichiometric proportion of the reaction mixture were performed, which influence the size, dispersity and synthesis rate of CCAgNPs...
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29768221/optimised-synthesis-of-zno-nano-fertiliser-through-green-chemistry-boosted-growth-dynamics-of-economically-important-l-esculentum
#12
Nyla Jabeen, Qaisar Maqbool, Tahira Bibi, Mudassar Nazar, Syed Z Hussain, Talib Hussain, Tariq Jan, Ishaq Ahmad, Malik Maaza, Sadaf Anwaar
Mounting-up economic losses to annual crops yield due to micronutrient deficiency, fertiliser inefficiency and increasing microbial invasions (e.g. Xanthomonas cempestri attack on tomatoes) are needed to be solved via nano-biotechnology. So keeping this in view, the authors' current study presents the new horizon in the field of nano-fertiliser with highly nutritive and preservative effect of green fabricated zinc oxide-nanostructures (ZnO-NSs) during Lycopersicum esculentum (tomato) growth dynamics. ZnO-NS prepared via green chemistry possesses highly homogenous crystalline structures well-characterised through ultraviolet and visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscope...
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29766716/pick-a-color-maria-adaptive-sampling-enables-the-rapid-identification-of-complex-perovskite-nanocrystal-compositions-with-defined-emission-characteristics
#13
Leonard Bezinge, Richard M Maceiczyk, Ioannis Lignos, Maksym V Kovalenko, Andrew J deMello
Recent advances in the development of hybrid organic-inorganic lead halide perovskite (LHP) nanocrystals (NCs) have demonstrated their versatility and potential application as photovoltaics and light emitters through compositional tuning of optical properties. That said, due to their compositional complexity, the targeted synthesis of mixed-cation, mixed-halide LHP NCs still represents an immense challenge for traditional batch scale chemistry. To address this limitation, we herein report the integration of a high-throughput segmented-flow microfluidic reactor and self-optimizing algorithm for the synthesis of nanocrystals with defined emission properties...
May 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29761185/cationic-hydrophobicity-promotes-dissolution-of-cellulose-in-aqueous-basic-solution-by-freezing-thawing
#14
Yang Wang, Lijuan Liu, Pan Chen, Lina Zhang, Ang Lu
The physical dissolution of cellulose in aqueous solutions of tetramethyl ammonium hydroxide, triethylmethyl ammonium hydroxide, tetraethyl ammonium hydroxide, benzyltrimethyl ammonium hydroxide, benzyltriethyl ammonium hydroxide, NaOH and LiOH via freezing-thawing was investigated. Increasing the hydrophobicity of the cation greatly improved its dissolution capacity, leading to significant enhancement of cellulose solubility and stability against chain aggregation and gelation. The hydrophobic cations accumulated at the cellulose interface and decreased the surface tension, favouring dispersion of the disintegrated cellulose due to its amphiphilicity; this was consistent with molecular dynamics simulations...
May 15, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29751270/calcium-oxide-modified-mesoporous-silica-loaded-onto-ferriferrous-oxide-core-magnetically-responsive-mesoporous-solid-strong-base
#15
Tian-Tian Li, Yu Liu, Shi-Chao Qi, Xiao-Qin Liu, Li Huang, Lin-Bing Sun
The design of new type of solid strong base with ideal activity, stability, and reusability is strongly urged by the growing demand of green chemistry and sustainable development. In this study, a new type of mesoporous solid strong base, denoted as CaO/mSiO2 /Fe3 O4 , is successfully fabricated by successively coating SiO2 onto Fe3 O4 magnetic nanoparticles and loading CaO into the mesoporous SiO2 . Compared with a series of other typical solid bases, the CaO/mSiO2 /Fe3 O4 exhibits higher activity towards the synthesis of dimethyl carbonate by the transesterification of ethylene carbonate and methanol...
May 3, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29750850/lipase-catalysed-synthesis-of-furan-based-oligoesters-and-their-self-assembly-assisted-polymerization
#16
Nagarajan Subbiah, Muthusamy K, Lalitha Krishnamoorthy, Siva Prasad Yadavali, Thamizhanban Ayyapillai, Sridharan Vellaisamy, Maheswari C Uma
Bio-based polyesters are well-known biodegradable materials that are frequently used in our daily life, which include food industries and biomedical fields. The journey towards the development of sustainable polymer materials and technology postulate the replacement of traditionally using petrochemical-based monomers, transition metal catalyst, and more intensive purification techniques, which do not agree with the green chemistry principles. This contribution investigates the synthesis of bio-based hydrophilic and hydrophobic oligoesters, which in turn derived from easily accessible monomers of natural resources...
May 11, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29745639/using-alkali-metal-ions-to-template-the-synthesis-of-interlocked-molecules
#17
Alex Inthasot, Shun-Te Tung, Sheng-Hsien Chiu
In 1987, Pedersen, Cram, and Lehn were awarded the Nobel Prize in Chemistry to honor their achievements in, among other things, the selective recognition of alkali metal ions by synthetic hosts. Almost three decades later, the 2016 Nobel Prize went to Stoddart, Sauvage, and Feringa for the development of artificial molecular machines, in which interlocked molecules play a significant role. Surprisingly, although many rotaxane- and catenane-based molecular machines have been constructed using various templating approaches, alkali metal ions, which are good templates for crown ether synthesis, have only rarely been applied as templates for the assembly of these interlocked molecules...
May 10, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29743852/n1-benzenesulfonyl-2-pyrazoline-hybrids-in-neurological-disorders-syntheses-biological-screening-and-computational-studies
#18
Avinash C Tripathi, Savita Upadhyay, Sarvesh Paliwal, Shailendra K Saraf
A novel series of 1,3,5-trisubstituted-2-pyrazolines (5a-5t ) was prepared via Claisen Schmidt condensation, followed by heterocyclization with hydrazine hydrate, substitution of N1 hydrogen of 2-pyrazoline nucleus with 4-chlorobenzenesulfonylchloride, applying conventional and green chemistry approaches. Among the two, microwave assisted organic synthesis (MAOS) emerged as a better synthetic tool in terms of faster reaction rate and high yield. Various physicochemical and spectral studies were conducted to characterize the synthesized derivatives including- IR, Mass, 1 H-NMR, 13 C-NMR and elemental analysis...
2018: EXCLI Journal
https://www.readbyqxmd.com/read/29742201/organic-synthesis-new-vistas-in-the-brazilian-landscape
#19
Ronaldo A Pilli, Francisco F DE Assis
In this overview, we present our analysis of the future of organic synthesis in Brazil, a highly innovative and strategic area of research which underpins our social and economical progress. Several different topics (automation, catalysis, green chemistry, scalability, methodological studies and total syntheses) were considered to hold promise for the future advance of chemical sciences in Brazil. In order to put it in perspective, contributions from Brazilian laboratories were selected by the citations received and importance for the field and were benchmarked against some of the most important results disclosed by authors worldwide...
2018: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/29739332/characterization-and-remediation-of-sample-index-swaps-by-non-redundant-dual-indexing-on-massively-parallel-sequencing-platforms
#20
Maura Costello, Mark Fleharty, Justin Abreu, Yossi Farjoun, Steven Ferriera, Laurie Holmes, Brian Granger, Lisa Green, Tom Howd, Tamara Mason, Gina Vicente, Michael Dasilva, Wendy Brodeur, Timothy DeSmet, Sheila Dodge, Niall J Lennon, Stacey Gabriel
BACKGROUND: Here we present an in-depth characterization of the mechanism of sequencer-induced sample contamination due to the phenomenon of index swapping that impacts Illumina sequencers employing patterned flow cells with Exclusion Amplification (ExAmp) chemistry (HiSeqX, HiSeq4000, and NovaSeq). We also present a remediation method that minimizes the impact of such swaps. RESULTS: Leveraging data collected over a two-year period, we demonstrate the widespread prevalence of index swapping in patterned flow cell data...
May 8, 2018: BMC Genomics
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