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https://www.readbyqxmd.com/read/28527426/malvidin-and-cyanidin-derivatives-from-a%C3%A3-ai-fruit-euterpe-oleracea-mart-counteract-uv-a-induced-oxidative-stress-in-immortalized-fibroblasts
#1
Ganna Petruk, Anna Illiano, Rita Del Giudice, Assunta Raiola, Angela Amoresano, Maria Manuela Rigano, Renata Piccoli, Daria Maria Monti
UV-A radiations are known to induce cellular oxidative stress, leading to premature skin aging. Consumption of açai fruit (Euterpe oleracea Martius) is known to have many health benefits due to its high level of antioxidants. Herein, we analyzed the ability of phenolic compounds extracted from this fruit to attenuate UV-A-induced oxidative stress in immortalized fibroblast. A methanol/water açai extract was fractionated by HPLC and each fraction tested for anti-oxidant stress activity. Immortalized fibroblasts were pre-incubated with açai fractions and then exposed to UV-A radiations...
May 12, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28527332/determination-of-parabens-in-human-urine-by-optimal-ultrasound-assisted-emulsification-microextraction-and-on-line-acetylation-gas-chromatography-mass-spectrometry
#2
Zhou Hui-Ting, Erica M C Ding, Wang-Hsien Ding
An effective and solvent-less method for the rapid determination of four commonly detected parabens (methyl-, ethyl-, propyl- and butyl-) in human urine samples is described. This method employed ultrasound-assisted emulsification microextraction (USAEME) before identification and quantitation of the parabens via on-line acetylation gas chromatography-mass spectrometry (GC-MS). Urine samples were enzymatically de-conjugated with β-glucuronidase and then extracted by an optimal USAEME procedure for the measurement of total concentrations of target analytes...
May 10, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28527322/arsenic-biotransformation-by-a-cyanobacterium-nostoc-sp-pcc-7120
#3
Xi-Mei Xue, Yu Yan, Chan Xiong, Georg Raber, Kevin Francesconi, Ting Pan, Jun Ye, Yong-Guan Zhu
Nostoc sp. PCC 7120 (Nostoc), a typical filamentous cyanobacterium ubiquitous in aquatic system, is recognized as a model organism to study prokaryotic cell differentiation and nitrogen fixation. In this study, Nostoc cells incubated with arsenite (As(III)) for two weeks were extracted with dichloromethane/methanol (DCM/MeOH) and the extract was partitioned between water and DCM. Arsenic species in aqueous and DCM layers were determined using high performance liquid chromatography - inductively coupled plasma mass spectrometer/electrospray tandem mass spectrometry (HPLC-ICPMS/ESIMSMS)...
May 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28527030/intravitreal-erythropoietin-injection-in-late-stage-optic-neuropathy-a-safety-study-on-human
#4
Ugur Acar, Bekir Kucuk, Mehmet Koray Sevinc, Seckin Aykas, Mesut Erdurmus, Gungor Sobaci
AIM: To evaluate the whether intravitreal erythropoietin (EPO) administration has any beneficial or adverse effect in patients with late-stage optic neuropathy (ON) or not. METHODS: The study examined 16 eyes of 16 patients who had late-stage ON and ≥1/20 best-corrected visual acuity (BCVA) in their affected eye. There were nonarteritic ischemic ON in 10 (62.5%) eyes, traumatic ON in 4 (25.0%) eyes and methanol-induced ON in 2 (12.5%) eyes. Using pars plana approach, 2000 IU/0...
May 19, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28526341/preparation-and-characterization-of-amidated-derivatives-of-alginic-acid
#5
Tomáš Taubner, Milan Marounek, Andriy Synytsya
Alginic acid is a suitable material for modification to prepare new derivatives because of presence of its carboxyl groups. The high content of carboxyl groups over the entire length of its chain renders it an easily modifiable material with a possibility of achieving a high degree of substitution in the prepared derivatives. The salt of alginic acid (sodium alginate) is readily commercially available and is widely used in many branches of chemistry. Alginic acid was thus selected as the substrate for amidation...
May 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28526029/cell-fixation-and-preservation-for-droplet-based-single-cell-transcriptomics
#6
Jonathan Alles, Nikos Karaiskos, Samantha D Praktiknjo, Stefanie Grosswendt, Philipp Wahle, Pierre-Louis Ruffault, Salah Ayoub, Luisa Schreyer, Anastasiya Boltengagen, Carmen Birchmeier, Robert Zinzen, Christine Kocks, Nikolaus Rajewsky
BACKGROUND: Recent developments in droplet-based microfluidics allow the transcriptional profiling of thousands of individual cells in a quantitative, highly parallel and cost-effective way. A critical, often limiting step is the preparation of cells in an unperturbed state, not altered by stress or ageing. Other challenges are rare cells that need to be collected over several days or samples prepared at different times or locations. METHODS: Here, we used chemical fixation to address these problems...
May 19, 2017: BMC Biology
https://www.readbyqxmd.com/read/28525865/a-selective-naked-eye-chemosensor-derived-from-2-methoxybenzylamine-and-2-3-dihydroxybenzaldehyde-synthesis-spectral-characterization-and-electrochemistry-of-its-bis-bidentates-schiff-bases-metal-complexes
#7
Aggoun Djouhra, Ourari Ali, Ruiz-Rosas Ramiro, Morallon Emilia
A new colorimetric receptor HL, acting as a bidentate Schiff base ligand, has been synthesized by condensation of 2-methoxybenzylamine on 2,3-dihydroxybenzaldehyde in a methanolic solution. Interestingly, this chelating agent can selectively detect Cu(2+), Co(2+), Fe(2+) and Fe(3+) ions with a simple and an easy-to-make, well defined naked-eye visible color changes in two different solvents like acetonitrile and methanol. This bidentate ligand coordinates three metal ions of Co(II), Cu(II) and Fe(II) via nitrogen and oxygen atoms...
May 10, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28525790/quantitative-lc-hrms-determination-of-selected-cardiovascular-drugs-in-dried-blood-spots-as-an-indicator-of-adherence-to-medication
#8
Dennis Bernieh, Graham Lawson, Sangeeta Tanna
Dried blood spot (DBS) sampling was investigated as a means of obtaining micro-volume blood samples for the quantitative analyses of ten commonly UK prescribed cardiovascular drugs as an indicator of medication adherence. An 8mm disc was punched out from each DBS from calibration, quality control and volunteer samples and extracted using methanol containing the internal standard. Each extract was evaporated to dryness, the residue reconstituted in methanol:water (40:60v/v) containing 0.1% formic acid and analysed by LC-HRMS...
May 6, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28524873/mesoporous-metallic-rhodium-nanoparticles
#9
Bo Jiang, Cuiling Li, Ömer Dag, Hideki Abe, Toshiaki Takei, Tsubasa Imai, Md Shahriar A Hossain, Md Tofazzal Islam, Kathleen Wood, Joel Henzie, Yusuke Yamauchi
Mesoporous noble metals are an emerging class of cutting-edge nanostructured catalysts due to their abundant exposed active sites and highly accessible surfaces. Although various noble metal (e.g. Pt, Pd and Au) structures have been synthesized by hard- and soft-templating methods, mesoporous rhodium (Rh) nanoparticles have never been generated via chemical reduction, in part due to the relatively high surface energy of rhodium (Rh) metal. Here we describe a simple, scalable route to generate mesoporous Rh by chemical reduction on polymeric micelle templates [poly(ethylene oxide)-b-poly(methyl methacrylate) (PEO-b-PMMA)]...
May 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28523730/investigating-the-effect-of-carbon-source-on-rabies-virus-glycoprotein-production-in-pichia-pastoris-by-a-transcriptomic-approach
#10
Safa Ben Azoun, Héla Kallel
Several factors affect protein expression in Pichia pastoris, one among them is the carbon source. In this work, we studied the effect of this factor on the expression level of rabies virus glycoprotein (RABV-G) in two recombinant clones harboring seven copies of the gene of interest. The expression was driven either by the constitutive glyceraldehyde-3-phosphate dehydrogenase (GAP) promoter or the inducible alcohol oxidase1 (AOX1) promoter. Clones were compared in terms of cell physiology and carbon source metabolism...
May 18, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28521956/comparative-life-cycle-assessment-of-alternative-strategies-for-energy-recovery-from-used-cooking-oil
#11
Lidia Lombardi, Barbara Mendecka, Ennio Carnevale
The separate collection of Used Cooking Oil (UCO) is gaining popularity through several countries in Europe. An appropriate management of UCO waste stream leads to substantial benefits. In this study, we analyse two different possibilities of UCO energy reuse: the direct feed to a reciprocating internal combustion engine (ICE) for cogeneration purpose, and the processing to generate biodiesel. Concerning biodiesel production, we analyse four among conventional and innovative technologies, characterised by different type and amount of used chemicals, heat and electricity consumptions and yields...
May 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28521788/methanol-extract-of-dicranopteris-linearis-l-leaves-impedes-acetaminophen-induced-liver-intoxication-partly-by-enhancing-the-endogenous-antioxidant-system
#12
Zainul Amiruddin Zakaria, Farah Hidayah Kamisan, Maizatul Hasyima Omar, Nur Diyana Mahmood, Fezah Othman, Siti Selina Abdul Hamid, Muhammad Nazrul Hakim Abdullah
BACKGROUND: The present study investigated the potential of methanolic extract of Dicranopteris linearis (MEDL) leaves to attenuate liver intoxication induced by acetaminophen (APAP) in rats. METHODS: A group of mice (n = 5) treated orally with a single dose (5000 mg/kg) of MEDL was first subjected to the acute toxicity study using the OECD 420 model. In the hepatoprotective study, six groups of rats (n = 6) were used and each received as follows: Group 1 (normal control; pretreated with 10% DMSO (extract's vehicle) followed by treatment with 10% DMSO (hepatotoxin's vehicle) (10% DMSO +10% DMSO)), Group 2 (hepatotoxic control; 10% DMSO +3 g/kg APAP (hepatotoxin)), Group 3 (positive control; 200 mg/kg silymarin +3 g/kg APAP), Group 4 (50 mg/kg MEDL +3 g/kg APAP), Group 5 (250 mg/kg MEDL +3 g/kg APAP) or Group 6 (500 mg/kg MEDL +3 g/kg APAP)...
May 18, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28520428/cyclic-diarylheptanoids-from-corylus-avellana-green-leafy-covers-determination-of-their-absolute-configurations-and-evaluation-of-their-antioxidant-and-antimicrobial-activities
#13
Antonietta Cerulli, Gianluigi Lauro, Milena Masullo, Vincenza Cantone, Beata Olas, Bogdan Kontek, Filomena Nazzaro, Giuseppe Bifulco, Sonia Piacente
The methanol extract of the leafy covers of Corylus avellana, source of the Italian PGI (protected geographical indication) product "Nocciola di Giffoni", afforded two new cyclic diarylheptanoids, giffonins T and U (2 and 3), along with two known cyclic diarylheptanoids, a quinic acid, flavonoid-, and citric acid derivatives. The structures of giffonins T and U were determined as highly hydroxylated cyclic diarylheptanoids by 1D and 2D NMR experiments. Their relative configurations were assigned by a combined quantum mechanical/NMR approach, comparing the experimental (13)C/(1)H NMR chemical shift data and the related predicted values...
May 18, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28517940/thermal-decomposition-of-potential-ester-biofuels-part-i-methyl-acetate-and-methyl-butanoate
#14
Jessica P Porterfield, David H Bross, Branko Ruscic, James H Thorpe, Thanh Lam Nguyen, Joshua H Baraban, John F Stanton, John W Daily, G Barney Ellison
Two methyl esters have been examined as models for the pyrolysis of biofuels. Dilute samples (0.06 - 0.13%) of methyl acetate (CH3COOCH3) and methyl butanoate (CH3CH2CH2COOCH3) were entrained in (He, Ar) carrier gas and decomposed in a set of flash-pyrolysis micro-reactors. The pyrolysis products resulting from the methyl esters were detected and identified by vacuum ultraviolet photoionization mass spectrometry. Complementary product identification was provided by matrix infrared absorption spectroscopy. Pyrolysis pressures in the pulsed micro-reactor were roughly 20 Torr and residence times through the reactors were approximately 25 - 150 µs...
May 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28516181/a-pulse-electrosynthesized-nanoporous-nickel-oxyhydroxide-borate-thin-film-in-electro-and-photoelectro-reforming-of-methanol-for-selective-production-of-formate
#15
Chia-Yu Lin, Yu-Chien Chueh, Cheng-Hsien Wu
An nanoporous nickel oxyhydroxide-borate (NiBi) thin film, consisting of an aggregate of spherical particles self-assembled from NiBi nanopetals, has been synthesized using a simple and cost-effective pulse electrodeposition method without the addition of any surfactant, and demonstrated as an efficient, selective, and robust electrocatalyst in the electrochemical and photoelectrochemical reforming of methanol into formate.
May 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28515769/inhibitory-effects-of-different-fractions-of-nepeta-satureioides-on-melanin-synthesis-through-reducing-oxidative-stress
#16
Seyed Ahmad Emami, Rezvan Yazdian-Robati, Mohammad Sadeghi, Javad Baharara, Elaheh Amini, Farzaneh Salek, Zahra Tayarani-Najaran
Nepeta satureioides Boiss. has been used in traditional medicine of eastern countries and is famous for its medicinal properties. The aim of this study was to evaluate the effect of methanol (MeOH), n-hexane and dichloromethane (CH2Cl2) fractions of the extract on melanin synthesis and oxidative stress in B16F10 melanoma cell line. The B16F10 cell line viability after treatment with increasing concentrations of different fractions of the plant (5-60 μg/mL) was measured using MTT assay. The inhibitory effect on synthesis of melanin, mushroom tyrosinase activity, cellular tyrosinase and oxidative stress were determined by the colorimetric and fluorometric methods...
April 2017: Research in Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28515381/preliminary-evaluation-of-glyceric-acid-producing-ability-of-acidomonas-methanolica-nbrc104435-from-glycerol-containing-methanol
#17
Shun Sato, Dai Kitamoto, Hiroshi Habe
Some acetic acid bacteria produce large amounts of glyceric acid (GA) from glycerol in culture broth. However, methanol, which is a major contaminant of raw glycerol derived from the biodiesel fuel industry, sharply decreases cell growth and GA production [AMB Express, 3, 20, 2013]. Thus, we evaluated the methylotrophic acetic acid bacterium Acidomonas methanolica NBRC104435 for its ability to produce GA from glycerol containing methanol. This strain accumulated GA in its culture broth when 1-3 wt% glycerol was available as a carbon source...
May 17, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28514136/highly-selective-voc-breath-analysis-using-a-broadly-tunable-vecsel
#18
Béla Tuzson, Jana Jágerská, Herbert Looser, Manuel Graf, Ferdinand Felder, Matthias Fill, Luc Tappy, Lukas Emmenegger
A broadly tunable mid-infrared VECSEL is employed in a direct absorption laser spectroscopic setup to measure acetone in breath-like gas matrix. The large wavelength coverage of more than 30 cm(-1) at 3.38 µm allows, besides acetone, the simultaneous measurement of isoprene, ethanol, methanol, methane, and water. Despite the severe spectral interferences from water and alcohols, an unambiguous determination of acetone is realized with a precision of 13 ppbv that is routinely achieved after 5 minutes averaging at typical breath mean acetone levels without any sample preparation...
May 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28513753/two-step-conversion-of-carboxylic-esters-into-distally-fluorinated-ketones-via-ring-cleavage-of-cyclopropanol-intermediates-application-of-sulfinate-salts-as-fluoroalkylating-reagents
#19
Yulia A Konik, Marina Kudrjashova, Nele Konrad, Sandra Kaabel, Ivar Järving, Margus Lopp, Dzmitry G Kananovich
Tertiary cyclopropanols easily available from carboxylic esters have been used in the synthesis of distally fluorinated ketones. Cyclopropane ring cleavage reactions in methanol with aqueous tert-butyl hydroperoxide in the presence of a copper(ii) acetate catalyst and sodium triflinate (Langlois reagent) afford β-trifluoromethyl ketones in 16-74% isolated yields. Sodium triflinate serves as a precursor of reactive trifluoromethyl copper species, enabling ring-opening trifluoromethylation, as evidenced by mechanistic studies...
May 17, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28513570/a-study-of-the-protective-properties-of-iraqi-olive-leaves-against-oxidation-and-pathogenic-bacteria-in-food-applications
#20
Ammar B Altemimi
There is an ancient and prodigious history of olive trees because of their nutritional, medicinal, and traditional uses. Intensive studies have been conducted on olive leaves because they have many positive and beneficial effects for human health. In this study, different solvents were used to examine the olive leaves for their antioxidant and antimicrobial activities and their possible food applications. The obtained results showed that the amounts of phenolic compounds of the olive leaf were 190.44 ± 0.50, 173 ± 1...
May 17, 2017: Antioxidants (Basel, Switzerland)
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