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https://www.readbyqxmd.com/read/28530197/green-fabricated-cuo-nanobullets-via-olea-europaea-leaf-extract-shows-auspicious-antimicrobial-potential
#1
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
https://www.readbyqxmd.com/read/28528626/colloid-particle-formulations-for-antimicrobial-applications
#2
REVIEW
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
https://www.readbyqxmd.com/read/28525843/formation-of-platinum-ii-as-a-six-member-ring-for-sustained-polymeric-delivery
#3
Sanjeewa N Senadheera, Ti Zhang, Chad E Groer, M Laird Forrest
A new pH-activated polymer chelate of cisplatin was synthesized using a scalable and green aqueous technique. Synthesis of the chelate was based on formation of a 6-member ring of platinum(II) with acetyl-homo-Lysine (Ac-homo-Lys), which was accomplished under completely aqueous conditions using a traceless photocleavable protection chemistry. Synthesis preceded by, first, amidation of a photocaged homo-Ac-Lys with hyaluronic acid (HA) in water using a p-hydroxyphenacyl (pHP) group as the photoremovable protecting group, followed by reaction of cisplatin (diaqua form) in water to form the reversible chelate...
May 6, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28522334/safety-evaluation-of-chlorella-sorokiniana-strain-ck-22-based-on-an-in%C3%A2-vitro-cytotoxicity-assay-and-a-13-week-subchronic-toxicity-trial-in-rats
#4
Sayaka Himuro, Sugi Ueno, Naoto Noguchi, Takuya Uchikawa, Toshihiro Kanno, Akira Yasutake
The genus Chlorella contains unicellular green algae that have been used as food supplements. The purpose of this work was to evaluate the safety of the Chlorella sorokiniana strain CK-22 using powdered preparation (CK-22P) both by in vitro and in vivo assays. These included an experiment for cytotoxicity using Chinese hamster lung fibroblasts (V79 cells) and a 13-week repeated-dose oral toxicity trial using Wistar rats. The cytotoxicity was evaluated by MTT assay of a hot water extract (Hw-Ex) and 80% ethanol extract (Et-Ex) of CK-22P, and no effect on cell viability was observed...
May 15, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28522008/chitosan-chondroitin-sulfate-hydrogels-prepared-in-hmim-hso4-ionic-liquid
#5
Cátia S Nunes, Kessily B Rufato, Paulo R Souza, Elizângela A M S de Almeida, Michael J V da Silva, Débora B Scariot, Celso V Nakamura, Fernanda A Rosa, Alessandro F Martins, Edvani C Muniz
[Hmim][HSO4] ionic liquid (IL) and bio-renewable sources as chitosan (CHT) and chondroitin sulfate (CS) were used to yield hydrogel-based materials (CHT/CS). The use of IL to solubilize both polysaccharides was considered an innovative way based on "green chemistry" principle, aiming the production of CHT/CS blended systems. CHT/CS hydrogels were carried out in homogeneous medium from short dissolution times. The hydrogels were characterized and achieved with excellent stabilities (in the 1.2-10pH range), larger swelling capacities, as well as devoid of cytotoxicity towards the normal VERO and diseased HT29 cells...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521388/non-targeted-high-resolution-mass-spectrometry-strategy-for-simultaneous-monitoring-of-xenobiotics-and-endogenous-compounds-in-green-sea-turtles-on-the-great-barrier-reef
#6
Amy L Heffernan, Maria M Gómez-Ramos, Caroline Gaus, Soumini Vijayasarathy, Ian Bell, Christine Hof, Jochen F Mueller, Maria J Gómez-Ramos
Chemical contamination poses a threat to ecosystem, biota and human health, and identifying these hazards is a complex challenge. Traditional hazard identification relies on a priori-defined targets of limited chemical scope, and is generally inappropriate for exploratory studies such as explaining toxicological effects in environmental systems. Here we present a non-target high resolution mass spectrometry environmental monitoring study with multivariate statistical analysis to simultaneously detect biomarkers of exposure (e...
May 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28516280/optimization-of-an-ultrasound-assisted-derivatization-for-gc-ms-analysis-of-oxygenated-organic-species-in-atmospheric-aerosol
#7
Maria Chiara Pietrogrande, Francesco Manarini, José Benito Quintana, Rosario Rodil, Eugenia Villaverde-de-Sáa, Marco Visentin
A novel ultrasound-assisted derivatization followed by GC/MS analysis was developed for the quantification of oxygenated organic species in ambient aerosol. Derivatization parameters mostly influencing the analytical response were investigated, i.e., solvent type, reagent concentration, and reaction duration. Response surface methodology was used to design experiments and a quadratic model was utilized to predict the variables and establish the optimal conditions. The study was performed on standard solutions of 30 compounds representing the major classes of oxygenated compounds typically found in ambient aerosol, i...
May 18, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28516207/enhancing-h2o2-resistance-of-an-esterase-from-pyrobaculum-calidifontis-by-structure-guided-engineering-of-the-substrate-binding-site
#8
Pengfei Zhou, Dongming Lan, Grzegorz Maria Popowicz, Xuping Wang, Bo Yang, Yonghua Wang
Green technologies are attracting increasing attention in industrial chemistry where enzymatic reactions can replace dangerous and environmentally unfriendly chemical processes. In situ enzymatic synthesis of peroxycarboxylic acid is an attractive alternative for several industrial applications although concentrated H2O2 can denature the biocatalyst, limiting its usefulness. Herein, we report the structure-guided engineering of the Pyrobaculum calidifontis esterase (PestE) substrate binding site to increase its stability and perhydrolysis activity...
May 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28507691/mechanism-of-resonant-electron-emission-from-the-deprotonated-gfp-chromophore-and-its-biomimetics
#9
Anastasia V Bochenkova, Ciarán R S Mooney, Michael A Parkes, Joanne L Woodhouse, Lijuan Zhang, Ross Lewin, John M Ward, Helen C Hailes, Lars H Andersen, Helen H Fielding
The Green Fluorescent Protein (GFP), which is widely used in bioimaging, is known to undergo light-induced redox transformations. Electron transfer is thought to occur resonantly through excited states of its chromophore; however, a detailed understanding of the electron gateway states of the chromophore is still missing. Here, we use photoelectron spectroscopy and high-level quantum chemistry calculations to show that following UV excitation, the ultrafast electron dynamics in the chromophore anion proceeds via an excited shape resonance strongly coupled to the open continuum...
April 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28497789/underwater-leidenfrost-nanochemistry-for-creation-of-size-tailored-zinc-peroxide-cancer-nanotherapeutics
#10
Mady Elbahri, Ramzy Abdelaziz, Duygu Disci-Zayed, Shahin Homaeigohar, Justyna Sosna, Dieter Adam, Lorenz Kienle, Torben Dankwort, Moheb Abdelaziz
The dynamic underwater chemistry seen in nature is inspiring for the next generation of eco-friendly nanochemistry. In this context, green synthesis of size-tailored nanoparticles in a facile and scalable manner via a dynamic process is an interesting challenge. Simulating the volcano-induced dynamic chemistry of the deep ocean, here we demonstrate the Leidenfrost dynamic chemistry occurring in an underwater overheated confined zone as a new tool for customized creation of nanoclusters of zinc peroxide. The hydrodynamic nature of the phenomenon ensures eruption of the nanoclusters towards a much colder region, giving rise to growth of monodisperse, size-tailored nanoclusters...
May 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28489389/stabilization-of-foam-lamella-using-novel-surface-grafted-nanocellulose-based-nanofluids
#11
Bing Wei, Hao Li, Qinzhi Li, Yangbing Wen, Lin Sun, Peng Wei, Wanfen Pu, Yibo Li
To solve the potential risk of present oilfield chemistries to subterranean environment, our group contributes to the development of "green" petroleum production processes. This proof-of-concept research studied the well-defined nanocellulose-based nanofluids, i.e., original (NC), AMPS grafted (NC-KY), and AMPS and hydrophobic chains grafted (NC-KYSS), in stabilizing foam lamella for potential use in enhanced oil recovery (EOR). The data showed that the collaboration of the surface-functional nanocellulose considerately improved the foam stability particularly in the presence of hydrocarbons due to the thickened foam film coupled with the molecular interactions at interior lamella...
May 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28488758/engineered-humicola-insolens-cutinase-for-efficient-cellulose-acetate-deacetylation
#12
Abhijit N Shirke, Glenn L Butterfoss, Rakhi Saikia, Aditya Basu, Leonardo de Maria, Allan Svendsen, Richard A Gross
Cutinases comprise a family of esterases with broad hydrolytic activity for chain and pendant ester groups. This work aimed to identify and improve an efficient cutinase for cellulose acetate (CA) deacetylation. The development of a mild method for CA fiber surface deacetylation will result in improved surface hydrophilicity and reactivity while, when combined with cellulases, a route to the full recycling of CA to acetate and glucose. In this study, the comparative CA deacetylation activity of 4 homologous wild-type (wt) fungal cutinases from Aspergillus oryzae (AoC), Thiellavia terrestris (TtC), Fusarium solani (FsC), and Humicola insolens (HiC) was determined by analysis of CA deacetylation kinetics...
May 10, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28484809/novel-fast-analytical-method-for-indirect-determination-of-mcpd-fatty-acid-esters-in-edible-oils-and-fats-based-on-simultaneous-extraction-and-derivatization
#13
Renata Jędrkiewicz, Agnieszka Głowacz-Różyńska, Justyna Gromadzka, Piotr Konieczka, Jacek Namieśnik
A novel method for indirect determination of MCPD esters levels in lipid samples has been developed. The method is based on combination of extraction and derivatization in the same sample preparation step. It is achieved by the application of diethyl ether as extraction solvent for isolation of analytes released from esterified forms from the water phase and as dilution solvent for solid PBA - the derivatization agent. It is a noteworthy improvement of recommended indirect approaches available in the literature because such steps as sample clean-up, multiple liquid-liquid extractions, and preconcentration are excluded in the proposed solution...
May 8, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28482613/a-combinatorial-approach-of-inclusion-complexation-and-dendrimer-synthesization-for-effective-targeting-egfr-tk
#14
Pravin Shende, Sampada Patil, R S Gaud
The aim of the present study was to use a combinatorial approach of inclusion complexation and dendrimer synthesization of gefitinib using solvent-free technique for targeting EGFR-TK to treat Non-Small-Cell Lung Cancer (NSCLC). The inclusion complex of gefitinib with β-cyclodextrin was prepared by trituration method. This complex encapsulated G4 PAMAM dendrimers were synthesized by Michael addition and amidation reactions using green chemistry and then PEGylated by conjugation reaction. FTIR and DSC confirmed the formation of inclusion complex of gefitinib and β-cyclodextrin and PEGylation of G4 PAMAM dendrimers...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28477379/tolyporphin-an-unusual-green-chlorin-like-dioxobacteriochlorin
#15
Christian Brückner
The tolyporphins, a family of green tetrapyrrolic pigments isolated from a cyanobacterium-microbial ecological unit, possess unique carbohydrate-derivatized dioxobacteriochlorin frameworks. A brief overview over the history, synthesis, chemistry, and biological properties of the tolyporphins form the backdrop for highlighting the contribution by Hood et al. [Hood, D., D. M. Niedzwiedzki, R. Zhang, Y. Zhang, J. Dai, E. S. Miller, D. F. Bocian, P. G. Williams, J. S. Lindsey and D. Holten (2017) Photochem. Photobiol...
May 6, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28471008/green-imidazolium-ionics-from-truly-sustainable-reagents-to-highly-functional-ionic-liquids
#16
Steffen Tröger-Müller, Jessica Brandt, Markus Antonietti, Clemens Liedel
We report the synthesis of task-specific imidazolium ionics and ionic liquids with key functionalities of organic molecules from electro-, polymer- and coordination chemistry. Products are highly functional and potentially suitable for technology applications even though they are formed without elaborate reactions from cheap and potentially green reagents. We further demonstrate the versatility of the used synthetic approach by introducing different functional and green counterions to the formed ionic liquids directly during the synthesis or after metathesis reactions...
May 4, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28469405/colorimetric-detection-based-on-localised-surface-plasmon-resonance-optical-characteristics-for-the-detection-of-hydrogen-peroxide-using-acacia-gum-stabilised-silver-nanoparticles
#17
Eman Alzahrani
The use of nanoparticles in sensing is attracting the interest of many researchers. The aim of this work was to fabricate Acacia gum-stabilised silver nanoparticles (SNPs) using green chemistry to use them as a highly sensitive and cost-effective localised surface plasmon resonance (LSPR) colorimeter sensor for the determination of reactive oxygen species, such as hydrogen peroxide (H2O2). Silver nanoparticles were fabricated by the reduction of an inorganic precursor silver nitrate solution (AgNO3) using white sugar as the reducing reagent and Acacia gum as the stabilising reagent and a sonication bath to form uniform silver nanoparticles...
2017: Analytical Chemistry Insights
https://www.readbyqxmd.com/read/28463409/sol-gel-graphene-based-fabric-phase-sorptive-extraction-for-cow-and-human-breast-milk-sample-cleanup-for-screening-bisphenol-a-and-residual-dental-restorative-material-before-analysis-by-hplc-with-diode-array-detection
#18
Victoria Samanidou, Olga Filippou, Eirini Marinou, Abuzar Kabir, Kenneth G Furton
Fabric-phase sorptive extraction has already been recognized as a simple and green alternative to the conventional sorbent-based sorptive microextraction techniques, using hybrid organic-inorganic sorbent coatings chemically bonded to a flexible fabric surface. Herein, we have investigated the synergistic combination of the advanced material properties offered by sol-gel graphene sorbent and the simplicity of Fabric phase sorptive extraction approach in selectively extracting bisphenol A and residual monomers including bisphenol A glycerolatedimethacrylate, urethane dimethacrylate and triethylene glycol dimethacrylate derived dental restorative materials from cow and human breast milk samples...
April 30, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28461781/zebrafish-as-an-in-vivo-model-for-sustainable-chemical-design
#19
Pamela D Noyes, Gloria R Garcia, Robert L Tanguay
Heightened public awareness about the many thousands of chemicals in use and present as persistent contaminants in the environment has increased the demand for safer chemicals and more rigorous toxicity testing. There is a growing recognition that the use of traditional test models and empirical approaches is impractical for screening for toxicity the many thousands of chemicals in the environment and the hundreds of new chemistries introduced each year. These realities coupled with the green chemistry movement have prompted efforts to implement more predictive-based approaches to evaluate chemical toxicity early in product development...
December 21, 2016: Green Chemistry: An International Journal and Green Chemistry Resource: GC
https://www.readbyqxmd.com/read/28461231/calculation-of-a-permitted-daily-exposure-value-for-the-solvent-2-methyltetrahydrofuran
#20
Patricia Parris, J Neil Duncan, Andrew Fleetwood, William P Beierschmitt
In response to increasing concerns around the potential environmental impact of industrial chemicals, the pharmaceutical industry is seeking alternatives for traditional solvents used during the manufacturing process. Taking into consideration the principles of green chemistry, 2-methyltetrahydrofuran (2-MeTHF) is proposed as a suitable replacement for the structurally similar solvent tetrahydrofuran (THF). 2-MeTHF is derived from renewable sources and is more easily recovered thereby facilitating its reuse...
April 29, 2017: Regulatory Toxicology and Pharmacology: RTP
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