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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
#1
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/28475112/insect-active-toxins-with-promiscuous-pharmacology-from-the-african-theraphosid-spider-monocentropus-balfouri
#2
Jennifer J Smith, Volker Herzig, Maria P Ikonomopoulou, Sławomir Dziemborowicz, Frank Bosmans, Graham M Nicholson, Glenn F King
Many chemical insecticides are becoming less efficacious due to rising resistance in pest species, which has created much interest in the development of new, eco-friendly bioinsecticides. Since insects are the primary prey of most spiders, their venoms are a rich source of insect-active peptides that can be used as leads for new bioinsecticides or as tools to study molecular receptors that are insecticidal targets. In the present study, we isolated two insecticidal peptides, µ/ω-TRTX-Mb1a and -Mb1b, from venom of the African tarantula Monocentropus balfouri...
May 5, 2017: Toxins
https://www.readbyqxmd.com/read/28447448/lanthanide-organic-gels-as-a-multifunctional-supramolecular-smart-platform
#3
José Yago Rodrigues Silva, Leonis Lourenço da Luz, Filipe Gabriel Martinez Mauricio, Iane Bezerra Vasconcelos Alves, Jamylle Nunes de Souza Ferro, Emiliano Barreto, Ingrid Távora Weber, Walter Mendes de Azevedo, Severino Alves Júnior
A multifunctional smart supramolecular platform based on a lanthanide-organic hydrogel is presented. This platform, which provides unique biocompatibility and tunable optical properties, is synthesized by a simple, fast, and reproducible eco-friendly microwave-assisted route. Photoluminescent properties enable the production of coated light-emitting diodes (LED), unique luminescent barcodes dependent on the excitation wavelength and thin-films for use in tamper seals. Moreover, piroxicam entrapped in hydrogel acts as a transdermal drug release device efficient in inhibiting edemas as compared to a commercial reference...
May 2, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28432957/nanoencapsulation-strategies-for-the-delivery-of-novel-bifunctional-antioxidant-%C3%AF-1-selective-ligands
#4
Claudia Carbone, Emanuela Arena, Veronica Pepe, Orazio Prezzavento, Ivana Cacciatore, Hasan Turkez, Agostino Marrazzo, Antonio Di Stefano, Giovanni Puglisi
Nowadays sigma-1 receptors are considered as new therapeutic objectives for central nervous system neurodegenerative diseases. Among different molecules, alpha lipoic acid has been identified as a natural potent antioxidant drug, whose therapeutic efficacy is limited by its many drawbacks, such as fast metabolism, poor bioavailability and high physico-chemical instability. Alfa-lipoic acid derivatives have been recently developed demonstrating their neuroprotective activity and effectiveness in different types of oxidative stress...
April 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28427675/use-of-pva-%C3%AE-mno2-stearic-acid-nanocomposite-films-prepared-by-sonochemical-method-as-a-potential-sorbent-for-adsorption-of-cd-ii-ion-from-aqueous-solution
#5
Shadpour Mallakpour, Forough Motirasoul
Alpha manganese dioxide (α-MnO2) nanorods have been covalently functionalized with stearic acid by solvothermal method. The α-MnO2-stearic acid nanorods were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. The amount of stearic acid grafted onto α-MnO2 surface was determined about 41wt% by thermogravimetric analysis. The α-MnO2-stearic acid nanorods was used as nanofiller for the preparation of poly(vinyl alcohol) (PVA) nanocomposites (NCs)...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28390320/in-situ-synthesis-of-cylindrical-spongy-polypyrrole-doped-protonated-graphitic-carbon-nitride-for-cholesterol-sensing-application
#6
Bishnu Kumar Shrestha, Rafiq Ahmad, Sita Shrestha, Chan Hee Park, Cheol Sang Kim
Herein, we demonstrate the exfoliation of bulk graphitic carbon nitrides (g-C3N4) into ultra-thin (~3.4nm) two-dimensional (2D) nanosheets and their functionalization with proton (g-C3N4H(+)). The layered semiconductor g-C3N4H(+) nanosheets were doped with cylindrical spongy shaped polypyrrole (CSPPy-g-C3N4H(+)) using chemical polymerization method. The as-prepared nanohybrid composite was utilized to fabricate cholesterol biosensors after immobilization of cholesterol oxidase (ChOx) at physiological pH. Large specific surface area and positive charge nature of CSPPy-g-C3N4H(+) composite has tendency to generate strong electrostatic attraction with negatively charged ChOx, and as a result they formed stable bionanohybrid composite with high enzyme loading...
April 4, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28382454/current-state-and-prospects-of-the-phytosynthesized-colloidal-gold-nanoparticles-and-their-applications-in-cancer-theranostics
#7
REVIEW
Muhammad Ovais, Abida Raza, Shagufta Naz, Nazar Ul Islam, Ali Talha Khalil, Shaukat Ali, Muhammad Adeeb Khan, Zabta Khan Shinwari
The design, development, and biomedical applications of phytochemical-based green synthesis of biocompatible colloidal gold nanoparticles (AuNPs) are becoming an emerging field due to several advantages (safer, eco-friendly, simple, fast, energy efficient, low-cost, and less toxic) over conventional chemical synthetic procedures. Biosynthesized colloidal gold nanoparticles are remarkably attractive in several biomedical applications including cancer theranostics due to small size, unusual physico-chemical properties, facile surface modification, high biocompatibility, and numerous other advantages...
May 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28378196/eco-friendly-control-of-the-poultry-red-mite-dermanyssus-gallinae-dermanyssidae-using-the-%C3%AE-thujone-rich-essential-oil-of-artemisia-sieberi-asteraceae-toxic-and-repellent-potential
#8
Mohaddeseh Abouhosseini Tabari, Mohammad Reza Youssefi, Giovanni Benelli
The poultry red mite, Dermanyssus gallinae, represents a key threat for the poultry industry worldwide. The control of D. gallinae is mainly achieved by continuous applications of acaricides. However, the fast-growing development of resistance, and the strict laws concerning chemicals admitted for treatments on food animals, highlighted the importance of alternative control tools. Here, we explored the potential of Artemisia sieberi essential oil against D. gallinae. In this study, the A. sieberi essential oil was analyzed using GC and GC-MS...
April 5, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28260379/layered-a2sn3s7%C3%A2-1-25h2o-a-organic-cation-as-efficient-ion-exchanger-for-rare-earth-element-recovery
#9
Xing-Hui Qi, Ke-Zhao Du, Mei-Ling Feng, Yu-Jie Gao, Xiao-Ying Huang, Mercouri G Kanatzidis
Exploring new ion-exchangers for the recovery of rare earth elements (REEs) and recycling is worthwhile for the high-tech industry and an eco-friendly sustainable economy. The efficient enrichment of low concentration REE from complex aqueous solutions containing large excess of competitive ions is challenging. Here we present a chalcogenide example as a superior REE ion-exchanger efficiently removing them from very complex aqueous solutions, (Me2NH2)1.33(Me3NH)0.67 Sn3S7·1.25H2O (FJSM-SnS). The material exhibits fast and efficient ion exchange behavior with short equilibrium time (<5 min), high adsorption capacity (139 mg/g for Eu, 147 mg/g for Tb, 126 mg/g for Nd), wide pH resistance (1...
March 15, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28254724/fast-algal-eco-toxicity-assessment-influence-of-light-intensity-and-exposure-time-on-chlorella-vulgaris-inhibition-by-atrazine-and-dcmu
#10
Alexandre Camuel, Benoit Guieysse, Cynthia Alcántara, Quentin Béchet
In order to develop a rapid assay suitable for algal eco-toxicity assessments under conditions representative of natural ecosystems, this study evaluated the short-term (<1h) response of algae exposed to atrazine and DCMU using oxygen productivity measurements. When Chlorella vulgaris was exposed to these herbicides under 'standard' low light intensity (as prescribed by OECD201 guideline), the 20min-EC50 values recorded via oxygen productivity (atrazine: 1.32±0.07μM; DCMU: 0.31±0.005μM) were similar the 96-h EC50 recorded via algal growth (atrazine: 0...
June 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28254611/practical-economical-and-eco-friendly-starch-supported-palladium-catalyst-for-suzuki-coupling-reactions
#11
Talat Baran
In catalytic systems, the support materials need to be both eco friendly and low cost as well as having high thermal and chemical stability. In this paper, a novel starch supported palladium catalyst, which had these outstanding properties, was designed and its catalytic activity was evaluated in a Suzuki coupling reaction under microwave heating with solvent-free and mild reaction conditions. The starch supported catalyst gave remarkable reaction yields after only 5min as a result of the coupling reaction of the phenyl boronic acid with 23 different substrates, which are bearing aril bromide, iodide, and chloride...
June 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28242372/green-synthesis-of-gold-nanoparticles-using-brown-algae-cystoseira-baccata-its-activity-in-colon-cancer-cells
#12
N González-Ballesteros, S Prado-López, J B Rodríguez-González, M Lastra, M C Rodríguez-Argüelles
This study is the first dealt with the use of brown macroalgae Cystoseira baccata (CB) extracts in obtaining gold nanoparticles (Au@CB) through an eco-friendly, fast, one-pot synthetic route. The formation of spherical, stable, polycrystalline nanoparticles with mean diameter of 8.4±2.2nm was demonstrated by UV-vis spectroscopy, TEM, HRTEM, STEM and zeta potential measurements. The extract appears to act as a protective agent where the particles are embedded, keeping them separated, avoiding aggregation and coalescence...
May 1, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28188348/graphene-oxide-fe3o4-as-sorbent-for-magnetic-solid-phase-extraction-coupled-with-liquid-chromatography-to-determine-2-4-6-trinitrotoluene-in-water-samples
#13
Luciana Costa Dos Reis, Lorena Vidal, Antonio Canals
A fast, simple, economical, and environmentally friendly magnetic solid-phase extraction (MSPE) procedure has been developed to preconcentrate 2,4,6-trinitrotoluene (TNT) from water samples prior to determination by liquid chromatography-UV-Vis employing graphene oxide/Fe3O4 nanocomposite as sorbent. The nanocomposite synthesis was investigated, and the MSPE was optimized by a multivariate approach. The optimum MSPE conditions were 40 mg of nanocomposite, 10 min of vortex extraction, 1 mL of acetonitrile as eluent, and 6 min of desorption in an ultrasonic bath...
February 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28111663/deep-eutectic-solvents-similia-similibus-solvuntur
#14
Stefan Zahn
Deep eutectic solvents, mixtures of an organic compound and a salt with a deep eutectic melting point, are promising cheap and eco-friendly alternatives to ionic liquids. Ab initio molecular dynamics simulations of reline, a mixture consisting of urea and choline chloride, reveal that not solely hydrogen bonds allow similar interactions between both constituents. The chloride anion and the oxygen atom of urea also show a similar spatial distribution close to the cationic core of choline due to a similar charge located on both atoms...
February 1, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28107903/ion-mobility-spectrometry-as-a-fast-analytical-tool-in-benzalkonium-chloride-homologs-determination
#15
D Gallart-Mateu, S Armenta, F A Esteve-Turrillas, M de la Guardia
A novel procedure is proposed for the determination by ion mobility spectrometry (IMS) of C12, C14 and C16 benzalkonium chloride (BAC) homologs. The proposed method requires minimum sample treatment and the measurement was made in less than one minute. A high sensitivity was obtained for BAC determination by IMS with limit of detection values from 37 to 69µgL(-1). Accuracy of the proposed methodology was evaluated through the analysis of aqueous and alcoholic samples spiked with BAC at concentration levels from 0...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28076353/a-topological-criterion-for-filtering-information-in-complex-brain-networks
#16
Fabrizio De Vico Fallani, Vito Latora, Mario Chavez
In many biological systems, the network of interactions between the elements can only be inferred from experimental measurements. In neuroscience, non-invasive imaging tools are extensively used to derive either structural or functional brain networks in-vivo. As a result of the inference process, we obtain a matrix of values corresponding to a fully connected and weighted network. To turn this into a useful sparse network, thresholding is typically adopted to cancel a percentage of the weakest connections...
January 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28057824/the-ecology-and-evolution-of-social-behavior-in-microbes
#17
REVIEW
Corina E Tarnita
Cooperation has been studied extensively across the tree of life, from eusociality in insects to social behavior in humans, but it is only recently that a social dimension has been recognized and extensively explored for microbes. Research into microbial cooperation has accelerated dramatically and microbes have become a favorite system because of their fast evolution, their convenience as lab study systems and the opportunity for molecular investigations. However, the study of microbes also poses significant challenges, such as a lack of knowledge and an inaccessibility of the ecological context (used here to include both the abiotic and the biotic environment) under which the trait deemed cooperative has evolved and is maintained...
January 1, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28000781/direct-synthesis-of-graphitic-mesoporous-carbon-from-green-phenolic-resins-exposed-to-subsequent-uv-and-ir-laser-irradiations
#18
Mihai Sopronyi, Felix Sima, Cyril Vaulot, Luc Delmotte, Armel Bahouka, Camelia Matei Ghimbeu
The design of mesoporous carbon materials with controlled textural and structural features by rapid, cost-effective and eco-friendly means is highly demanded for many fields of applications. We report herein on the fast and tailored synthesis of mesoporous carbon by UV and IR laser assisted irradiations of a solution consisting of green phenolic resins and surfactant agent. By tailoring the UV laser parameters such as energy, pulse repetition rate or exposure time carbon materials with different pore size, architecture and wall thickness were obtained...
December 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27988899/microwave-assisted-enhancement-of-milkweed-calotropis-procera-l-leaves-as-an-eco-friendly-source-of-natural-colorants-for-textile
#19
Muhammad Hussaan, Naeem Iqbal, Shahid Adeel, Muhammad Azeem, M Tariq Javed, Ali Raza
Application of natural colorants to textile fabrics has gained worldwide public acceptance due to the hazardous nature of synthetic dyes. Present study investigated the microwave's mediated extraction of natural colorants from leaves of milkweed (Calotropis procera L.) as well as their application to cotton fabrics assisted with biochemical mordants. Dye extraction from C. procera leaves was carried out in various mediums (alkali and aqueous), and the extracted dye as well as cotton fabrics was irradiated with microwaves for 2, 4, 6, 8, or 10 min...
December 17, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27771100/centrifuge-less-dispersive-liquid-liquid-microextraction-base-on-the-solidification-of-switchable-solvent-for-rapid-on-site-extraction-of-four-pyrethroid-insecticides-in-water-samples
#20
Lu Hu, Huazi Wang, Heng Qian, Chaoran Liu, Runhua Lu, Sanbing Zhang, Wenfeng Zhou, Haixiang Gao, Donghui Xu
An on-site dispersive liquid liquid microextraction base on the solidification of switchable solvent has been developed as a simple, rapid and eco-friendly sample extraction method for the fast determination of pyrethroid insecticides in aqueous samples using high-performance liquid chromatography with ultraviolet detection. In this extraction method, medium-chain saturated fatty acids (n≥10), which can rapidly solidify at low temperatures (<20°C), were investigated as switchable hydrophilic solvents...
November 11, 2016: Journal of Chromatography. A
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