Read by QxMD icon Read

Green chemistry

Muhammad Imran Din, Aneela Rani
The green fabrication of nanoparticles (NPs) by using plants as reducing and capping agents involves energy efficient, less toxic, safer and simpler pathways. These pathways have been related to the rational use of numerous substances in fabrication of NPs and synthetic strategies, which have been mainly discussed in this article. The subject matter of this review is to discuss how a chemist can follow the green chemistry principles in terms of selection of substances and protocols used for NPs fabrication...
March 21, 2018: Critical Reviews in Analytical Chemistry
Cezar A Bizzi, Sandra M Cruz, Lucas Schmidt, Robert A Burrow, Juliano S Barin, Jose N G Paniz, Erico M M Flores
A new method for analytical applications based on the Maxwell-Wagner effect is proposed. Considering the interaction of carbonaceous materials with an electromagnetic field in the microwave frequency range, a very fast heating is observed due to interfacial polarization that results in localized microplasma formation. Such effect was evaluated in this work using a monomode microwave system, and temperature was recorded using an infrared camera. For analytical applications, a closed reactor under oxygen pressure was evaluated...
March 21, 2018: Analytical Chemistry
Ben Buse, Stuart Kearns
Automated phase maps are an important tool for characterizing samples but the data quality must be evaluated. Common options include the overlay of phases on backscattered electron (BSE) images and phase composition averages and standard deviations. Both these methods have major limitations. We propose two methods of evaluation involving principal component analysis. First, a red-green-blue composite image of the first three principal components, which comprise the majority of the chemical variation, which provides a good reference against which phase maps can be compared...
March 21, 2018: Microscopy and Microanalysis
Żaneta Bargańska, Dimitra Lambropoulou, Jacek Namieśnik
Bumblebees play an important role in the pollination process of many crops and flowers. Therefore, taking action to protect and assess the impact of pesticides on these insects is fully justified. Pesticides may cause mortality and also sub-lethal effects that are not always directly visible. Bumblebees, like honeybees, can be used as indicators for environmental monitoring contamination. Two approaches are mainly used for the determination of pesticide residues in pollinating insects: a toxicological test (to know effects) and multi-stage analytical methodologies (to know exposure)...
March 20, 2018: Critical Reviews in Analytical Chemistry
Yangbo Wang, Bingxiao Yang, Kun Chen, Enlong Zhou, Qinghua Zhang, Lisha Yin, Xiaoji Xie, Lin Gu, Ling Huang
Scandium (Sc) sits at a unique position in the periodic table, i.e., the junction of the top of the rare earth column and the beginning of the transition metal row. Studies have shown that Sc-based nanomaterials are very sensitive to the surrounding chemical environment. A simple adjustment of the chemical reaction conditions such as temperature, surfactant molecules, and solvents (e.g., oleic acid (OA) or 1-octadecene (OD)) can easily lead to different products in terms of chemical composition and phase structure...
March 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Etienne Jambon-Puillet, Christophe Josserand, Suzie Protiere
Solid particles can modify the properties of liquid interfaces and are therefore widely used to coat drops, bubbles and stabilize emulsions and foams. Here we propose a new, easy and affordable method to produce millimetric to centimetric water-in-water capsules using solid particles. We prevent the coalescence of a water drop at an oil-water interface using a monolayer of large, dense and hydrophobic particles: a ``granular raft''. The capsule is then formed by a mechanical instability occurring when the interface collapses under the combined load of the floating drop and particle weight...
March 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Ahmed Ma'mun, Mohamed K Abd El-Rahman, Mohamed Abd El-Kawy
In recent years, the whole field of ion-selective electrodes(ISEs) in pharmaceutical sciences has expanded far beyond its original roots. The diverse range of opportunities offered by ISEs was broadly used in a number of pharmaceutical applications, with topics presented ranging from bioanalysis of drugs and metabolites, to protein binding studies, green analytical chemistry, impurity profiling, and drug dissolution in biorelevant media. Inspired from these advances and with the aim of extending the functional capabilities of ISEs, the primary focus of the present paper is the utilization of ISE as a tool in personalized medicine...
February 7, 2018: Journal of Pharmaceutical and Biomedical Analysis
V K Sharma, R Mukhopadhyay
Ionic liquids (ILs) are a special class of low-temperature (typically < 100 °C) molten salts, which have huge upsurge interest in the field of chemical synthesis, catalysis, electrochemistry, pharmacology, and biotechnology, mainly due to their highly tunable nature and exceptional properties. However, practical uses of ILs are restricted mainly due to their adverse actions on organisms. Understanding interactions of ILs with biomembrane is prerequisite to assimilate the actions of these ionic compounds on the organism...
March 16, 2018: Biophysical Reviews
James C Courtenay, Ram I Sharma, Janet L Scott
Tissue engineering is a rapidly advancing field in regenerative medicine, with much research directed towards the production of new biomaterial scaffolds with tailored properties to generate functional tissue for specific applications. Recently, principles of sustainability, eco-efficiency and green chemistry have begun to guide the development of a new generation of materials, such as cellulose, as an alternative to conventional polymers based on conversion of fossil carbon (e.g., oil) and finding technologies to reduce the use of animal and human derived biomolecules (e...
March 14, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Melissa Conte, Josselin Lupette, Khawla Seddiki, Coline Meï, Lina J Dolch, Valerie Gros, Caroline Barette, Fabrice Rébeillé, Juliette Jouhet, Eric Marechal
Microalgae are a promising feedstock for the production of triacylglycerol (TAG) for a variety of potential applications, ranging from food and human health to biofuels and green chemistry. However, obtaining high TAG yields is challenging. A phenotypic assay for accumulation of oil droplets was developed to screen a library of 1,200 drugs, annotated with pharmacology information, to select compounds that trigger TAG accumulation in the diatom Phaeodactylum. Using this screen, we identified 34 molecules acting in a dose-dependent manner...
March 13, 2018: Plant Physiology
Christopher Finnegan, David Ryan, Anne-Marie Enright, Guiomar Garcia-Cabellos
Tributyltin (TBT) is one of the most toxic anthropogenic compounds introduced into the marine environment. Despite its global ban in 2008, TBT is still a problem of great concern due to its high affinity for particulate matter, providing a direct and potentially persistent route of entry into benthic sediments. Bioremediation strategies may constitute an alternative approach to conventional physicochemical methods, benefiting from the microorganism's potential to metabolize anthropogenic compounds. In this work, a simple, precise and accurate static headspace gas chromatography method was developed to investigate the ability of TBT degrading microbes in sedimentary microcosms over a period of 120 days...
March 10, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Ralph Freund, Ulrich Lächelt, Tobias Gruber, Bastian Rühle, Stefan Wuttke
Green chemistry, in particular, the principle of atom economy, has defined new criteria for the efficient and sustainable production of synthetic compounds. In complex nanomaterials, the number of embedded functional entities and the energy expenditure of the assembly process represent additional compound-associated parameters that can be evaluated from an economic viewpoint. In this Perspective, we extend the principle of atom economy to the study and characterization of multifunctionality in nanocarriers, which we define as "multifunctional efficiency"...
March 13, 2018: ACS Nano
Robin S Sleith, John D Wehr, Kenneth G Karol
Forecasting changes in the distributions of macrophytes is essential to understanding how aquatic ecosystems will respond to climate and environmental changes. Previous work in aquatic ecosystems has used climate data at large scales and chemistry data at small scales; the consequence of using these different data types has not been evaluated. This study combines a survey of macrophyte diversity and water chemistry measurements at a large regional scale to demonstrate the feasibility and necessity of including ecological measurements, in addition to climate data, in species distribution models of aquatic macrophytes...
March 2018: Ecology and Evolution
Robert Naumann, Martin Goez
We present a novel photoredox catalytic system that delivers synthetically useable concentrations of hydrated electrons when illuminated with a green light-emitting diode (LED). The catalyst is a ruthenium complex protected by an anionic micelle, and the urate dianion serves as sacrificial donor confined to the aqueous bulk. Through its chemical properties, that donor not only suppresses charge recombination that would limit the electron yield but also enables this system to perform cross couplings via hydrated electrons, for which we report the first examples...
March 12, 2018: Chemistry: a European Journal
Deepak Bhandari, Brett A Bowman, Anish B Patel, David M Chambers, Víctor R De Jesús, Benjamin C Blount
This work describes a quantitative high-throughput analytical method for the simultaneous measurement of small aliphatic nitrogenous biomarkers, i.e., 1,6-hexamethylenediamine (HDA), isophoronediamine (IPDA), β-methylamino-l-alanine (BMAA), and trimethylamine N-oxide (TMAO), in human urine. Urinary aliphatic diamines, HDA and IPDA, are potential biomarkers of environmental exposure to their corresponding diisocyanates. Urinary BMAA forms as a result of human exposure to blue-green algae contaminated food. And, TMAO is excreted in urine due to the consumption of carnitine- and choline-rich diets...
March 2, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Alessandra H Ide, José Manuel F Nogueira
A new hybrid microextraction technique (hollow fiber microextraction) is presented that uses the main concepts and advantages of the modern miniaturized devices used for trace analysis. This novel analytical approach uses devices made of polypropylene membranes (10.0 mm long and 0.6 mm internal diameter) in which convenient organic solvents are embedded that promote fast kinetics during the enrichment process, using the floating sampling technology concept. An innovative analytical cycle is also proposed by use of low-cost disposable devices during the microextraction stage together with a user-friendly ("single liquid desorption step") back-extraction stage in compliance with green analytical chemistry principles...
March 10, 2018: Analytical and Bioanalytical Chemistry
Zhenzhen Zhang, Yongmei Wu, Shizhen He, Yuanyuan Xu, Gaiping Li, Baoxian Ye
This work focused on the development of a novel ratiometric fluorescence sensor for detection of Hg2+ by using dye-doped lanthanide infinite coordination polymer (Ln-ICP) particles. The dye-doped Ln-ICP used herein was prepared by self-assemble of adenosine monophosphate (AMP) with Ce3+ and Tb3+ (Ce/Tb-AMP) through self-adaptive chemistry, in which the fluorescent dye coumarin was encapsulated during the assembly process as a guest molecule. Under 310 nm irradiation, the obtained coumarin@Ce/Tb-AMP itself emitted characteristic green luminescence of Tb3+ , accompanied with a weak fluorescence at 445 nm originated from coumarin encapsulated in the Ce/Tb-AMP networks...
July 19, 2018: Analytica Chimica Acta
Hidayat Hussain, Ivan R Green, Ishtiaq Ahmed
No abstract text is available yet for this article.
March 9, 2018: Chemical Reviews
Snehali Mali, Sachin Shinde, Shashikant Damte, Suresh Patil
Without using any toxic or hazardous reagent, ligand, acid, transition metal catalyst, additives/promoters and organic solvent, green Knoevenagel condensation and tandem Knoevenagel-Michael reactions have been successfully carried out by using chickpea leaf exudates as a naturally sourced Bronsted acid type bio-catalyst. The reaction proceeds in neat chickpea leaf exudates at room temperature in aqueous conditions in very short reaction times, and therefore, it is an evergreen and environmentally sound alternative to the existing protocols for benzopyran synthesis...
February 2018: Royal Society Open Science
Safak Bulut, Wendy L Queen
The formation of C-N bonds with aryl amines is one of the most widely studied reactions in organic chemistry. Despite this, it is still highly challenging often requiring expensive, precious metal-based catalysts. Here we report an easy catalyst-free methodology for constructing C-N bonds. The method, which proceeds via the in situ formation of closed ring amidinium ions, allows the preparation of a series of symmetrical and/or unsymmetrical aryl diamines in notably high yields (82-98 %) and purity and with a variety of different substituents...
March 5, 2018: Journal of Organic Chemistry
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"