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Green chemistry

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https://www.readbyqxmd.com/read/28734297/nonequilibrium-phase-coexistence-and-criticality-near-the-second-explosion-limit-of-hydrogen-combustion
#1
Lucas B Newcomb, Mohammad Alaghemandi, Jason R Green
While hydrogen is a promising source of clean energy, the safety and optimization of hydrogen technologies rely on controlling ignition through explosion limits: pressure-temperature boundaries separating explosive behavior from comparatively slow burning. Here, we show that the emergent nonequilibrium chemistry of combustible mixtures can exhibit the quantitative features of a phase transition. With stochastic simulations of the chemical kinetics for a model mechanism of hydrogen combustion, we show that the boundaries marking explosive domains of kinetic behavior are nonequilibrium critical points...
July 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28732982/sonochemical-green-reduction-to-prepare-ag-nanoparticles-decorated-graphene-sheets-for-catalytic-performance-and-antibacterial-application
#2
Sayan Ganguly, Poushali Das, Madhuparna Bose, Tushar Kanti Das, Subhadip Mondal, Amit Kumar Das, Narayan C Das
The emerging popularity and wide acceptance of green chemistry and environmentally benign/ecofriendly approaches have comprehensively considered for catalyst synthesis methods. Natural resource derived carbogenic quantum dots has been used in assistance with ultrasonic shock wave to graphene oxide (GO) aqueous dispersion in order to prepare reduced graphene oxide decorated with silver nanoparticles following the 'top-down' method. The total reduction process is done without using any toxic external reducing agents and any surfactants or stabilizers, thus it can be accepted as green method...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732952/ultrasound-promoted-direct-functionalization-of-multi-walled-carbon-nanotubes-in-water-via-diels-alder-click-chemistry
#3
Cuong M Q Le, Xuan Thang Cao, Kwon Taek Lim
A facile and environmentally friendly strategy for grafting polymers onto the surface of multi-walled carbon nanotubes (CNTs) was demonstrated by Diels-Alder "click chemistry". Firstly, the copolymers of poly(styrene-alt-maleic anhydride) (PSM) were prepared by the reversible addition-fragmentation chain transfer (RAFT) polymerization and subsequently functionalized with furfuryl amine to introduce anchoring groups. The copolymers were then grafted on CNTs via the Diels-Alder reaction in water through a conventional heating-stirring route and ultrasound-assisted method...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28723168/enhanced-room-temperature-oxygen-sensing-properties-of-laocl-sno2-hollow-spheres-by-uv-light-illumination
#4
Ya Xiong, Wenbo Lu, Degong Ding, Lei Zhu, Xiaofang Li, Cuicui Ling, Qingzhong Xue
In this paper, a facile and elegant Green Chemistry method for the synthesis of SnO2 based hollow spheres has been investigated. The influences of doping, crystallite morphology, and operating condition on the O2 sensing performances of SnO2 based hollow-sphere sensors were comprehensively studied. It was indicated that, compared with undoped SnO2, 10 at. % LaOCl-doped SnO2 possessed better O2 sensing characteristics owing to an increase of specific surface area and oxygen vacancy defect caused by LaOCl dopant...
May 26, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722734/scavenging-and-recombination-kinetics-in-radiation-chemistry
#5
Eyad H Al-Samra, Nicholas J B Green
This work describes stochastic models developed to study the competition between radical scavenging and recombination for simple model systems typical of radiation chemistry, where the reactive particles are tightly clustered and reactions are assumed fully diffusion limited. Three models are developed: a Monte Carlo random flights model with a periodic boundary condition for scavengers, Monte Carlo simulations in which the scavenging rate is calculated from the Smoluchowski theory for diffusion-limited reactions and a modification of the independent reaction times method where the scavengers close to the spur are explicitly included and the scavengers further away are treated as a continuum...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28717021/genetic-and-metabolic-engineering-in-diatoms
#6
REVIEW
Weichao Huang, Fayza Daboussi
Diatoms have attracted considerable attention due to their success in diverse environmental conditions, which probably is a consequence of their complex origins. Studies of their metabolism will provide insight into their adaptation capacity and are a prerequisite for metabolic engineering. Several years of investigation have led to the development of the genome engineering tools required for such studies, and a profusion of appropriate tools is now available for exploring and exploiting the metabolism of these organisms...
September 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28714902/fluorescence-modulation-of-green-fluorescent-protein-using-fluorinated-unnatural-amino-acids
#7
Jordan K Villa, Hong-Anh Tran, Megha Vipani, Stephanie Gianturco, Konark Bhasin, Brent L Russell, Elizabeth J Harbron, Douglas D Young
The ability to modulate protein function through minimal perturbations to amino acid structure represents an ideal mechanism to engineer optimized proteins. Due to the novel spectroscopic properties of green fluorescent protein, it has found widespread application as a reporter protein throughout the fields of biology and chemistry. Using site-specific amino acid mutagenesis, we have incorporated various fluorotyrosine residues directly into the fluorophore of the protein, altering the fluorescence and shifting the pKa of the phenolic proton associated with the fluorophore...
July 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28707240/elemental-mobility-in-sulfidic-mine-tailings-reclaimed-with-paper-mill-by-products-as-sealing-materials
#8
Yu Jia, Nanna Stahre, Maria Mäkitalo, Christian Maurice, Björn Öhlander
Sealing layers made of two alkaline paper mill by-products, fly ash and green liquor dregs, were placed on top of 50-year-old sulfide-containing tailings as a full-scale remediation approach. The performance and effectiveness of the sealing layers with high water content for an oxygen barrier and low hydraulic conductivity for a sealing layer in preventing the formation of acid rock drainage were evaluated 5 years after the remediation. The leaching behavior of the covered tailings was studied using batch leaching tests (L/S ratio 10 L/kg)...
July 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28703094/dynamic-headspace-sampling-as-an-initial-step-for-sample-preparation-in-chromatographic-analysis
#9
Wojciech Wojnowski, Tomasz Majchrzak, Tomasz Dymerski, Jacek Gębicki, Jacek Namieśnik
This work represents a brief summary of the use of dynamic headspace (DHS) as a technique for sample preparation in chromatographic analysis. Despite numerous developments in the area of analyte isolation and enrichment, DHS remains one of the fundamental methods used with GC. In our opinion, interest in this technique will not diminish significantly because it conforms to stipulations of green analytical chemistry. Moreover, DHS fulfills the need for methods that facilitate detection and determination of analytes present at ultratrace levels in complex matrices...
July 13, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28694813/intrapopulation-genotypic-variation-of-foliar-secondary-chemistry-during-leaf-senescence-and-litter-decomposition-in-silver-birch-betula-pendula
#10
Ulla Paaso, Sarita Keski-Saari, Markku Keinänen, Heini Karvinen, Tarja Silfver, Matti Rousi, Juha Mikola
Abundant secondary metabolites, such as condensed tannins, and their interpopulation genotypic variation can remain through plant leaf senescence and affect litter decomposition. Whether the intrapopulation genotypic variation of a more diverse assortment of secondary metabolites equally persists through leaf senescence and litter decomposition is not well understood. We analyzed concentrations of intracellular phenolics, epicuticular flavonoid aglycones, epicuticular triterpenoids, condensed tannins, and lignin in green leaves, senescent leaves and partly decomposed litter of silver birch, Betula pendula...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28694764/2-pyrazoline-derivatives-in-neuropharmacology-synthesis-adme-prediction-molecular-docking-and-in-vivo-biological-evaluation
#11
Savita Upadhyay, Avinash C Tripathi, Sarvesh Paliwal, Shailendra K Saraf
A novel series of 1,3,5-trisubstituted-2-pyrazoline derivatives (PFC-1 to PFC-16) were synthesized in a three step reaction using conventional and microwave assisted green chemistry approach. The synthesized derivatives were characterized and their chemical structures were established by various physicochemical methods such as IR, Mass, (1)H-NMR, (13)C-NMR and elemental analysis. The synthesized compounds were tested for their neuropharmacological potential. The compounds exhibited significant antidepressant and anti-anxiety activities against various behavioral in vivo models...
2017: EXCLI journal
https://www.readbyqxmd.com/read/28690262/colorimetric-detection-of-mercury-ii-ion-in-aqueous-solution-using-silver-nanoparticles
#12
M Lutfi Firdaus, Ikka Fitriani, Santhy Wyantuti, Yeni W Hartati, Renat Khaydarov, Jason A McAlister, Hajime Obata, Toshitaka Gamo
Novel green-chemistry synthesis of silver nanoparticles (AgNPs) is introduced as a low-cost, rapid and easy-to-use analytical method for mercury ion detection. Aqueous fruit extract of water apple (Syzygium aqueum) was used for the first time as bioreductant to synthesize stable AgNPs. The prepared AgNPs have a yellowish-brown color with a surface plasmon resonance peak at 420 nm. The addition of Hg(II) ions then changes the AgNPs color to colorless. The color change was in proportion to the concentration of Hg(II) ions...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28685683/applications-of-cellulose-based-materials-in-sustained-drug-delivery-systems
#13
Bo Sun, Min Zhang, Jing Shen, Zhibin He, Pedram Fatehi, Yonghao Ni
Bio-compatible, bio-degradable, and bio-available excipients are of critical interest for drug delivery systems. Cellulose and its derivative-based excipients have been well studied due to their green/ natural and unique encapsulation/ binding properties. They are often used in controlled/ sustained drug delivery systems. In these applications, cellulose and its derivatives function generally can modify the solubility/gelling behavior of drugs, resulting in different mechanisms for controlling the release profiles of drugs...
July 5, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28682509/prospective-symbiosis-of-green-chemistry-and-energetic-materials
#14
Ilya V Kuchurov, Mikhail N Zharkov, Leonid L Fershtat, Nina N Makhova, Sergei G Zlotin
A global increase in the environmental pollution demands the development of new "cleaner" chemical processes. Among urgent improvements, replacement of traditional hydrocarbon-derived toxic organic solvents with neoteric solvents less harmful for the environment is one of the most vital issues. Due to favorable combination of unique properties, ionic liquids (ILs), dense gases, and supercritical fluids (SCFs) have gained considered attention as suitable green chemistry media for preparation and modification of important chemical compounds and materials...
July 6, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28678466/graphene-and-graphene-analogs-toward-optical-electronic-spintronic-green-chemical-energy-material-sensing-and-medical-applications
#15
M Reza Rezapour, Chang Woo Myung, Jeonghun Yun, Amirreza Ghassami, Nannan Li, Seong Uk Yu, Amir Hajibabaei, Youngsin Park, Kwang S Kim
This spotlight discusses intriguing properties and diverse applications of graphene (Gr) and Gr analogs. Gr has brought us two-dimensional (2D) chemistry with its exotic 2D features of density of states. Yet, some of the 2D or 2D-like features can be seen on surfaces and at interfaces of bulk materials. The substrate on Gr and functionalization of Gr (including metal decoration, intercalation, doping, and hybridization) modify the unique 2D features of Gr. Despite abundant literature on physical properties and well-known applications of Gr, spotlight works based on the conceptual understanding of the 2D physical and chemical nature of Gr toward vast-ranging applications are hardly found...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28674875/preparation-of-platelet-concentrates-for-research-and-transfusion-purposes
#16
David W Greening, Richard J Simpson, Rosemary L Sparrow
Platelets are specialized cellular elements of the blood that play central roles in physiologic and pathologic processes of hemostasis, wound healing, host defense, thrombosis, inflammation, and tumor metastasis. Activation of platelets is crucial for platelet function that includes a complex interplay of adhesion, signaling molecules, and release of bioactive factors. Transfusion of platelet concentrates is an important treatment component for thrombocytopenia and bleeding. Recent progress in high-throughput mRNA and protein profiling techniques has advanced the understanding of platelet biological functions toward identifying novel platelet-expressed and secreted proteins, analyzing functional changes between normal and pathologic states, and determining the effects of processing and storage on platelet concentrates for transfusion...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28664698/puffed-cereals-with-added-chamomile-quantitative-analysis-of-polyphenols-and-optimization-of-their-extraction-method
#17
Tomasz Blicharski, Anna Oniszczuk, Marta Olech, Tomasz Oniszczuk, Agnieszka Wójtowicz, Wojciech Krawczyk, Renata Nowak
[b]Abstract Introduction[/b]. Functional food plays an important role in the prevention, management and treatment of chronic diseases. One of the most interesting techniques of functional food production is extrusion-cooking. Functional foods may include such items as puffed cereals, breads and beverages that are fortified with vitamins, some nutraceuticals and herbs. Due to its pharmacological activity, chamomile flowers are the most popular components added to functional food. OBJECTIVE: Quantitative analysis of polyphenolic antioxidants, as well as comparison of various methods for the extraction of phenolic compounds from corn puffed cereals, puffed cereals with an addition of chamomile (3, 5, 10 and 20%) and from [i]Chamomillae anthodium...
May 11, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28660928/weak-interactions-and-their-impact-on-cellulose-dissolution-in-an-alkali-urea-aqueous-system
#18
Sen Wang, Peng Sun, Maili Liu, Ang Lu, Lina Zhang
Weak interactions, though sometimes easily ignored, play an important role in macromolecule dissolution. In this work, the characterization of weak interactions between urea and cellulose in a LiOH/urea aqueous solution was accomplished and confirmed in situ, for the first time, using PFG-SE NMR, FT-IR and solvatochromic methods, etc. The NMR results indicated the binding of urea with cellulose in the solution, demonstrating the existence of the weak interactions between them. Subsequently, the solvatochromic methods revealed that urea hardly affected the hydrogen bond donor (HBD acidity) and hydrogen bond acceptor (HBA basicity) properties of the solvent, but was related to its dipolarity and polarizability, indicating that dispersion forces existed therein, but not likely hydrogen bonding, which was also supported by the FT-IR...
July 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28654276/mercouri-g-kanatzidis-excellence-and-innovations-in-inorganic-and-solid-state-chemistry
#19
Indika U Arachchige, Gerasimos S Armatas, Kanishka Biswas, Kota S Subrahmanyam, Susan Latturner, Christos D Malliakas, Manolis J Manos, Youngtak Oh, Kyriaki Polychronopoulou, Pierre F P Poudeu, Pantelis N Trikalitis, Qichun Zhang, Li-Dong Zhao, Sebastian C Peter
Over the last 3-4 decades, solid-state chemistry has emerged as the forefront of materials design and development. The field has revolutionized into a multidisciplinary subject and matured with a scope of new synthetic strategies, new challenges, and opportunities. Understanding the structure is very crucial in the design of appropriate materials for desired applications. Professor Mercouri G. Kanatzidis has encountered both challenges and opportunities during the course of the discovery of many novel materials...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28644993/long-term-toxicity-of-surface-charged-polystyrene-nanoplastics-to-marine-planktonic-species-dunaliella-tertiolecta-and-artemia-franciscana
#20
E Bergami, S Pugnalini, M L Vannuccini, L Manfra, C Faleri, F Savorelli, K A Dawson, I Corsi
Plastic pollution has been globally recognized as a critical issue for marine ecosystems and nanoplastics constitute one of the last unexplored areas to understand the magnitude of this threat. However, current difficulties in sampling and identifying nano-sized debris make hard to assess their occurrence in marine environment. Polystyrene nanoparticles (PS NPs) are largely used as nanoplastics in ecotoxicological studies and although acute exposures have been already investigated, long-term toxicity on marine organisms is unknown...
June 15, 2017: Aquatic Toxicology
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