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Green chemistry

Yu-Feng Liang, Ning Jiao
The selective oxidation of organic molecules is a fundamentally important component of modern synthetic chemistry. In the past decades, direct oxidative C-H and C-C bond functionalization has proved to be one of the most efficient and straightforward methods to synthesize complex products from simple and readily available starting materials. Among these oxidative processes, the use of molecular oxygen as a green and sustainable oxidant has attracted considerable attention because of its highly atom-economical, abundant, and environmentally friendly characteristics...
June 21, 2017: Accounts of Chemical Research
Sneha R Bansode, Virendra K Rathod
Ultrasonic irradiation has recently gained attention of researchers for its process intensification in numerous reactions. Earlier ultrasound was known for its application either to deactivate enzyme activity or to disrupt the cell. However, in recent years, practice of ultrasonic irradiation began to emerge as a tool for the activation of the enzymes under mild frequency conditions. The incorporation of ultrasound in any of enzymatic reactions not only increases yield but also accelerates the rate of reaction in the presence of mild conditions with better yield and less side-products...
September 2017: Ultrasonics Sonochemistry
Stamatia-Maria Rapti, Christos K Kontos, Spyridon Christodoulou, Iordanis N Papadopoulos, Andreas Scorilas
OBJECTIVES: MicroRNA-34a (miR-34a) is regulated by TP53 and, in response, downregulates the expression of a gamut of protein-coding genes, including apoptosis regulators, transcription factors, cyclins, and cyclin-dependent kinases. Its upregulation initiates a reprogramming of gene expression and promotes apoptosis. The purpose of this study was the investigation of the potential clinical significance of miR-34a as a molecular prognostic biomarker in colorectal adenocarcinoma using an in-house real-time quantitative PCR (qPCR) methodology...
June 14, 2017: Clinical Biochemistry
Magdalena M Ślączka-Wilk, Elżbieta Włodarczyk, Aleksandra Kaleniecka, Paweł K Zarzycki
There is increasing interest in the development of simple analytical systems enabling the fast screening of target components in complex samples. A number of newly invented protocols are based on quasi separation techniques involving microfluidic paper-based analytical devices and/or micro total analysis systems. Under such conditions, the quantification of target components can be performed mainly due to selective detection. The main goal of this paper is to demonstrate that miniaturized planar chromatography has the capability to work as an efficient separation and quantification tool for the analysis of multiple targets within complex environmental samples isolated and concentrated using an optimized SPE method...
June 16, 2017: Journal of AOAC International
Hidayat Hussain, Ivan R Green
Isocoumarins comprise a six-membered oxygen heterocycle (α-pyranone) along with one aromatic ring and are known to possess interesting biological properties. During the last two decade (1997-2016), isocoumarin chemistry has attracted attention due to its biological and pharmaceutical effects viz., anticancer, anti-diabetic, antibacterial, antimalarial, and fungicidal effects. Areas covered: This review covers the patents on the therapeutic activities of natural and synthetic isocoumarins over the last two decades (1997-2016)...
June 16, 2017: Expert Opinion on Therapeutic Patents
Cindy Schaude, Eleonore Fröhlich, Claudia Meindl, Jennifer Attard, Barbara Binder, Gerhard J Mohr
Indicator cotton swabs have been developed in order to enable faster, less expensive, and simpler information gathering of a wound status. Swabs are normally used for cleaning the wound, but here, they were covalently functionalized with indicator chemistry. Thus, they in principle enable simultaneous wound cleaning and wound pH detection. Using an indicator dye with a color change from yellow to red, combined with an inert dye of blue color, a traffic light color change from green to red is induced when pH increases...
June 12, 2017: Sensors
Yumin Leng, Kai Jiang, Wentai Zhang, Yuhui Wang
Metal-mediated interlocking rings won the 2016 Nobel Prize in Chemistry. The metal-directed interlocking rings in macromolecular systems (e.g. proteins) may be similar to the form of Maxwell's electromagnetic waves, the metal ions may shuttle among the rings in the special environment. To verify this hypothesis, we designed a general approach to synthesize the multicolor gold nanoparticles (GNPs) mediated by Au(I)-directed interlocking rings in proteins. The Au(I) ions shuttled among these interlocking rings in the strong alkaline solution...
June 5, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
W B F Jalil, A Pentón-Madrigal, A Mello, F A Carneiro, R M Soares, L S Baptista, J P Sinnecker, L A S de Oliveira
Superparamagnetic magnetite nanoparticles have been synthesized by a highly reproducible polyvinyl alcohol (PVA)-based modified sol-gel process using water as the only solvent. The synthesis method has proven to be effective, time and cost saving and environmental friendly, resulting in PVA-coated magnetite nanoparticles as direct product from the synthesis, without any special atmosphere or further thermal treatment. X-ray diffraction and transmission electron microscopy revealed that the biocompatible PVA-coating prevents the nanoparticle agglomeration, giving rise to spherical crystals with sizes of 6...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Achim Wieczorek, Philipp Werther, Jonas Euchner, Richard Wombacher
Fluorogenic probes for bioorthogonal labeling chemistry are highly beneficial to reduce background signal in fluorescence microscopy imaging. 1,2,4,5-Tetrazines are known substrates for the bioorthogonal inverse electron demand Diels-Alder reaction (DAinv) and tetrazine substituted fluorophores can exhibit fluorogenic properties. Herein, we report the synthesis of a palette of novel fluorogenic tetrazine dyes derived from widely-used fluorophores that cover the entire emission range from green to far-red. We demonstrate the power of the new fluorogenic probes in fixed and live cell labeling experiments and present the first example of intracellular live cell protein imaging using tetrazine-based probes under no-wash conditions...
February 1, 2017: Chemical Science
Feifan Wang, Yanjie Huang, Zhigang Chai, Min Zeng, Qi Li, Yuan Wang, Dongsheng Xu
Conventional semiconductor photocatalysis based on band-edge absorption remains inefficient due to the limited harvesting of solar irradiation and the complicated surface/interface chemistry. Herein, novel photothermal-enhanced catalysis was achieved in a core-shell hierarchical Cu7S4 nano-heater@ZIF-8 heterostructures via near-infrared localized surface plasmon resonance. Our results demonstrated that both the high surface temperature of the photothermal Cu7S4 core and the close-adjacency of catalytic ZIF-8 shell contributed to the extremely enhanced catalytic activity...
December 1, 2016: Chemical Science
Mariadas Valan Arasu, R Thirumamagal, M P Srinivasan, Naif Abdullah Al-Dhabi, A Ayeshamariam, D Saravana Kumar, N Punithavelan, M Jayachandran
Nanomaterials of CeO2 with A. vera were synthesized by using simple chemical method. Grapes drops are used as an oxidizing agent. Structural and morphological studies of nanomaterials of cerium oxide (CeO2), were studied for combustion method of preparation. The precursor solution was initialized by a hydrothermal reaction. Cerium hydroxyl carbonate precursors which involves cerium (III) nitrate Ce(NO3)3. 6 H2O with (1.0M) of seashell powder, 3% A. vera, extracts, grapes and pomegranate drops and this complex solution was used to produce the CeO2 powder particles...
May 24, 2017: Journal of Photochemistry and Photobiology. B, Biology
Martin Lahn Henriksen, Jens Bomholdt Ravnsbaek, Morten Bjerring, Thomas Vosegaard, Kim Daasbjerg, Mogens Hinge
Epoxy based thermosets are one of the most popular material matrices in many industries and significant environmental benefits can be obtained by development of a recyclable epoxy variant of this widely utilized material. This paper demonstrates that addition of a biobased additive to a commercial epoxy system leads to a crosslinked material that can be fractionated under mild and environmentally benign conditions. The novel material has been analyzed by FT-IR and solid state NMR. Furthermore, modified epoxy matrices with low additive concentrations are demonstrated to have similar mechanical and thermal properties when benchmarked against the commercial available epoxy matrix...
May 30, 2017: ChemSusChem
Fathy M Hassan, Qianqian Hu, Jing Fu, Rasim Batmaz, Jingde Li, Aiping Yu, Xingcheng Xiao, Zhongwei Chen
Tuned chalcogenide single crystals rooted in sulfur-doped graphene were prepared by high-temperature solution chemistry. We present a facile route to synthesize a rod-on-sheet-like nanohybrid as an active anode material and demonstrate its superior performance in lithium ion batteries (LIBs). This nanohybrid contains a nanoassembly of one-dimensional (1D) single-crystalline, orthorhombic SnS onto two-dimensional (2D) sulfur-doped graphene. The 1D nanoscaled SnS with the rodlike single-crystalline structure possesses improved transport properties compared to its 2D hexagonal platelike SnS2...
June 21, 2017: ACS Applied Materials & Interfaces
C Snodgrass, M F A'Hearn, F Aceituno, V Afanasiev, S Bagnulo, J Bauer, G Bergond, S Besse, N Biver, D Bodewits, H Boehnhardt, B P Bonev, G Borisov, B Carry, V Casanova, A Cochran, B C Conn, B Davidsson, J K Davies, J de León, E de Mooij, M de Val-Borro, M Delacruz, M A DiSanti, J E Drew, R Duffard, N J T Edberg, S Faggi, L Feaga, A Fitzsimmons, H Fujiwara, E L Gibb, M Gillon, S F Green, A Guijarro, A Guilbert-Lepoutre, P J Gutiérrez, E Hadamcik, O Hainaut, S Haque, R Hedrosa, D Hines, U Hopp, F Hoyo, D Hutsemékers, M Hyland, O Ivanova, E Jehin, G H Jones, J V Keane, M S P Kelley, N Kiselev, J Kleyna, M Kluge, M M Knight, R Kokotanekova, D Koschny, E A Kramer, J J López-Moreno, P Lacerda, L M Lara, J Lasue, H J Lehto, A C Levasseur-Regourd, J Licandro, Z Y Lin, T Lister, S C Lowry, A Mainzer, J Manfroid, J Marchant, A J McKay, A McNeill, K J Meech, M Micheli, I Mohammed, M Monguió, F Moreno, O Muñoz, M J Mumma, P Nikolov, C Opitom, J L Ortiz, L Paganini, M Pajuelo, F J Pozuelos, S Protopapa, T Pursimo, B Rajkumar, Y Ramanjooloo, E Ramos, C Ries, A Riffeser, V Rosenbush, P Rousselot, E L Ryan, P Santos-Sanz, D G Schleicher, M Schmidt, R Schulz, A K Sen, A Somero, A Sota, A Stinson, J M Sunshine, A Thompson, G P Tozzi, C Tubiana, G L Villanueva, X Wang, D H Wooden, M Yagi, B Yang, B Zaprudin, T J Zegmott
We present a summary of the campaign of remote observations that supported the European Space Agency's Rosetta mission. Telescopes across the globe (and in space) followed comet 67P/Churyumov-Gerasimenko from before Rosetta's arrival until nearly the end of the mission in September 2016. These provided essential data for mission planning, large-scale context information for the coma and tails beyond the spacecraft and a way to directly compare 67P with other comets. The observations revealed 67P to be a relatively 'well-behaved' comet, typical of Jupiter family comets and with activity patterns that repeat from orbit to orbit...
July 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Kamlesh Kumari, Vijay K Vishvakarma, Prashant Singh, Rajan Patel, Ramesh Chandra
Green Chemistry is an interdisciplinary science or can also be explained as a branch of chemistry. It is generally described as the chemistry to aim to synthesize chemical compounds to trim down the utilization of harmful chemicals proposed by the Environmental Protection Agency (EPA). Recently, the plan of academicians, researchers, industrialists is to generate greener and more efficient methodologies to carry out various organic syntheses. In the present scenario, green chemistry utilizes the raw materials economically, minimizes the waste and prevents the uses of harmful or hazardous chemicals to make the organic reactions simple and efficient...
May 28, 2017: Current Medicinal Chemistry
Sathishkumar G, Logeshwaran V, Sarathbabu S, Pradeep K Jha, Jeyaraj M, Rajkuberan C, Senthilkumar N, Sivaramakrishnan S
In the present study, a sustainable green chemistry approach was established to fabricate magnetic Fe3O4 nanoparticles (Fe3O4NPs) using the aqueous fruit extract of edible C. guianensis (CGFE). Synthesized NPs were further confirmed with different high-throughput characterization techniques such as UV-visible spectroscopy, FT-IR, XPS, DLS and zeta potential analysis. Additionally, XRD, AFM, HRTEM and SQUID VSM demonstrate the generation of crystalline CGFe3O4NPs with mean diameter of 17 ± 10 nm. Interestingly, CGFe3O4NPs exhibit a stupendous bactericidal action against different human pathogens which depicts its antimicrobial value...
May 29, 2017: Artificial Cells, Nanomedicine, and Biotechnology
Alessandra S Oliveira, Flávia M Dalla Nora, Renius O Mello, Paola A Mello, Bruna Tischer, Adilson B Costa, Juliano S Barin
A simple and fast method is proposed for determining the alcoholic content of distilled beverages by thermal infrared enthalpimetry (TIE), in which purified water is added directly and the temperature rise caused by the heat of dilution is monitored using an infrared camera. A calibration curve was constructed with hydroalcoholic reference solutions to determine the alcoholic content of vodka, whisky, and cachaça. The influence of the total volume of solutions in the reactor, the stirring speed, the dispensing rate, and the ratio between hydroalcoholic samples and water were evaluated to reach an optimum mixture and provide low variation among measurements...
August 15, 2017: Talanta
Lara M Groves, Christiane Schotten, Joseph Beames, James A Platts, Simon J Coles, Peter N Horton, Duncan L Browne, Simon J A Pope
A first-generation machine-assisted approach towards the preparation of hybrid ligand/metal materials has been developed. A comparison of synthetic approaches demonstrates that incorporation of both flow chemistry and microwave heating can be successfully applied to the rapid synthesis of a range of new phenyl-1H-pyrazoles (ppz) substituted with electron-withdrawing groups (-F, -CF3 , -OCF3 , and -SF5 ). These, in turn, can be translated into heteroleptic complexes, [Ir(ppz)2 (bipy)]BF4 (bipy=2,2'-bipyridine)...
May 22, 2017: Chemistry: a European Journal
Qaisar Maqbool, Sidra Iftikhar, Mudassar Nazar, Fazal Abbas, Asif Saleem, Talib Hussain, Rizwan Kausar, Sadaf Anwaar, Nyla Jabeen
In present investigation, copper oxide (CuO) nanostructures have been prepared via green chemistry. Olea europaea leaf extract act as strong chelating agent for tailoring physical as well as bio-medical characteristics of CuO at the nano-size. Physical characterisation such as scanning electron microscope analysis depicts the formation of homogenised spherical shape nanoparticles (NPs) with average size of 42 nm. X-ray diffraction and Fourier transform infrared spectroscopy further confirmed the crystalline pure phase and monoclinic structure...
June 2017: IET Nanobiotechnology
Ahmed F Halbus, Tommy S Horozov, Vesselin N Paunov
Colloidal particles are being extensively studied in various antimicrobial applications due to their small size to volume ratio and ability to exhibit a wide spectrum of antibacterial, antifungal, antialgal and antiviral action. The present review focuses on various nanoparticles (NPs) of inorganic, organic and hybrid materials, and discusses some of the methods for their preparation as well as mechanisms of their antimicrobial action. We consider the antimicrobial applications of metal oxide nanoparticles (ZnO, MgO, CuO, Cu2O, Al2O3, TiO2, CeO2 and Y2O3), metal nanoparticles (NPs), such as copper, silver and gold, metal hydroxide NPs such as Mg(OH)2 as well as hybrid NPs made from biodegradable materials, such as chitosan, lignin and dextran, loaded with other antimicrobial agents...
May 12, 2017: Advances in Colloid and Interface Science
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