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Methylene Chloride

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https://www.readbyqxmd.com/read/29666852/methylene-bridged-bimetallic-bis-imino-pyridine-cobaltous-chlorides-as-precatalysts-for-vinyl-terminated-polyethylene-waxes
#1
Qiang Chen, Wenjuan Zhang, Gregory A Solan, Tongling Liang, Wen-Hua Sun
Four examples of phenol-substituted methylene-bridged bis(imino)pyridines, CH(C6H4-4-OH){2'-(4-C6H2-2,6-R22N[double bond, length as m-dash]CMe)-6'-(2'',6''-R12C6H3N[double bond, length as m-dash]CMe)C5H3N}2 [R1 = R2 = Me L1, R1 = R2 = Et L2, R1 = Et, R2 = Me L3, R1 = iPr, R2 = Me L4], have been synthesized and fully characterized. Treatment of L1-L4 with two equivalents of cobaltous chloride affords the bimetallic complexes, [(L)Co2Cl4] (L = L1 Co1, L2 Co2, L3 Co3, L4 Co4), in good yield. The molecular structure of Co1 shows the two metal centers to be separated by a distance of 13...
April 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29659742/sample-pretreatment-method-for-determination-of-indicator-polychlorinated-biphenyls-in-seafood-using-ultrasonic-extraction-followed-by-dispersive-solid-phase-extraction-and-gas-chromatography-electron-capture-detection
#2
Bin Zheng, Hongmei Hu, Xiaoning Zhang, Yuanming Guo, Xiaojun Zhang, Lijian Xue, Xingwei Xiang, Lu Zhang
A simple, rapid and novel method has been developed and validated for the determination of seven indicator polychlorinated biphenyls (PCBs) in seafood samples by gas chromatography coupled to electron capture detector. Freeze-dried samples were done first ultrasonic extraction by n-hexane:methylene chloride:acetone (3:1:1, v/v), and then one-step clean-up (dispersive solid-phase extraction clean-up) or two-step clean-up (concentrated sulfuric acid purification and dispersive solid-phase extraction clean-up) was selected according to the lipid contents of the samples, if the lipid content was no more than 1%, one-step clean-up was used, otherwise, two-step clean-up was chose...
April 11, 2018: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29608875/blue-green-discoloration-of-urine-and-false-nephrotic-range-proteinuria-at-dipstick-urinalysis
#3
Jose Poloni, Marina Sassi, LIane Rotta, Mark Perazella, Tiago Oliverira
A 32 year-old woman presented to the emergency department with symptoms of urinary tract infection. Over the past 2 days, she reported the use of a medication whose active compounds were methenamine (120 mg) + methylthioninium chloride (20 mg). A collected urine sample had a strong blue-green discoloration. Uroculture was negative and dipstick urinalysis revealed the following results: SG 1.015, pH 7, Albumin 3+, Bilirubin 2+ and Haemoglobin 2+. Urine microscopic analysis revealed 5-6 squamous epithelial cells/high power field (HPF), 5-6 leukocytes/HPF and 7-8 erythrocytes/HPF...
March 30, 2018: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/29594593/an-electrochemical-aptamer-based-assay-for-femtomolar-determination-of-insulin-using-a-screen-printed-electrode-modified-with-mesoporous-carbon-and-1-3-6-8-pyrenetetrasulfonate
#4
Mahmoud Amouzadeh Tabrizi, Mojtaba Shamsipur, Reza Saber, Saeed Sarkar, Maryam Besharati
The authors describe an electrochemical method for aptamer-based determination of insulin at femtomolar concentrations. The surface of a screen printed electrode was modified with ordered mesoporous carbon that was chemically modified with 1,3,6,8-pyrenetetrasulfonate (TPS). The amino-terminated aptamer was then covalently linked to TPS via reactive sulfonyl chloride groups. Subsequently, the redox probe Methylene Blue (MB) was interacted into the aptamer. The MB-modified binds to insulin and this results in the release of MB and a decreased signal as obtained by differential pulse voltammetry, best at a working voltage of -0...
December 18, 2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/29588333/case-control-investigation-of-occupational-exposure-to-chlorinated-solvents-and-non-hodgkin-s-lymphoma
#5
Catherine L Callahan, Patricia A Stewart, Melissa C Friesen, Sarah Locke, Anneclaire J De Roos, James R Cerhan, Richard K Severson, Nathaniel Rothman, Mark P Purdue
OBJECTIVES: Although many studies have investigated the association between trichloroethylene (TCE) exposure and non-Hodgkin's lymphoma (NHL), less is known about other chlorinated solvents. We extended our previous analysis of occupational TCE exposure in a multicentre population-based case-control study of NHL to investigate associations with five additional chlorinated solvents: 1,1,1,-trichloroethane, carbon tetrachloride, chloroform, methylene chloride and perchloroethylene. METHODS: Cases (n=1189) and controls (n=982) provided detailed information on their occupational histories and workplace exposure to chlorinated solvents for selected occupations using job-specific interview modules...
March 27, 2018: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/29577137/c5-morpholinomethylation-of-n1-sulfonylcytosines-by-a-one-pot-microwave-assisted-mannich-reaction
#6
Josipa Matić, Irena Nekola, Aleksandar Višnjevac, Renata Kobetić, Irena Martin-Kleiner, Marijeta Kralj, Biserka Žinić
A fast and efficient route for the introduction of a methylene bridged-amine (morpholinomethyl) functionality in the C5 position of the sulfonylated cytosine nucleobase has been developed. First, novel N1-sulfonylcytosine derivatives 3-6 were prepared by the condensation of silylated cytosine with selected sulfonyl chlorides. They were subsequently transformed to 5-morpholinomethyl-N1-sulfonylcytosine derivatives (8, 12-15) using microwave irradiation. As a result of cytosine ring opening in N1-tosylcytosine, depending on the reaction conditions, peculiar tosyl-urea derivative 9 has been isolated, which provided additional insight into the reaction pathway...
March 26, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29575046/enhancing-integration-of-articular-cartilage-grafts-via-photochemical-bonding
#7
Alberto L Arvayo, Ivan J Wong, Jason L Dragoo, Marc E Levenston
The integration of osteochondral grafts to native articular cartilage is critical as the lack of graft integration may lead to poor load transfer and nutrient transport and continued tissue degradation. Photochemical bonding promotes graft integration by activating a photosensitizer at the interface via a light source and avoids negative effects associated with other bonding techniques. We hypothesized that the bond strength depends on photosensitizer type and concentration and light exposure. Photochemical bonding was evaluated using methylene blue (MB), a cationic phenothiazine photosensitizer, and two phthalocyanine photosensitizers, Al(III) Phthalocyanine Chloride Tetrasulfonic Acid (CASPc) and aluminum phthalocyanine chloride (AlPc)...
March 25, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29567292/n-terminome-and-proteogenomic-analysis-of-the-methylobacterium-extorquens-dm4-reference-strain-for-dichloromethane-utilization
#8
Sabrina Bibi-Triki, Gauthier Husson, Bruno Maucourt, Stéphane Vuilleumier, Christine Carapito, Françoise Bringel
Methylobacterium strains can use one-carbon compounds, such as methanol, for methylotrophic growth. In addition to methanol, a few strains also utilize dichloromethane, a major industrial chlorinated solvent pollutant. With a fully assembled and annotated genome, M. extorquens DM4 is the reference bacterium for aerobic dichloromethane degradation. The doublet N-terminal oriented proteomics (dN-TOP) strategy was applied to further improve its genome annotation and a differential proteomics approach was performed to compare M...
March 19, 2018: Journal of Proteomics
https://www.readbyqxmd.com/read/29561056/thermodynamic-properties-of-selenoether-functionalized-ionic-liquids-and-their-use-for-the-synthesis-of-zinc-selenide-nanoparticles
#9
Karsten Klauke, Dzmitry H Zaitsau, Mark Bülow, Li He, Maximilian Klopotowski, Tim-Oliver Knedel, Juri Barthel, Christoph Held, Sergey P Verevkin, Christoph Janiak
Three selenoether-functionalized ionic liquids (ILs) of N-[(phenylseleno)methylene]pyridinium (1), N-(methyl)- (2) and N-(butyl)-N'-[(phenylseleno)methylene]imidazolium (3) with bis(trifluoromethanesulfonyl)imide anions ([NTf2]) were prepared from pyridine, N-methylimidazole and N-butylimidazole with in situ obtained phenylselenomethyl chloride, followed by ion exchange to give the desired compounds. The crystal structures of the bromide and tetraphenylborate salts of the above cations (1-Br, 2-BPh4 and 3-BPh4) confirm the formation of the desired cations and indicate a multitude of different supramolecular interactions besides the dominating Coulomb interactions between the cations and anions...
March 21, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29552696/mechanism-of-vasorelaxation-induced-by-3-hydroxy-5-6-7-4-tetramethoxyflavone-in-the-rats-aortic-ring-assay
#10
Chu Shan Tan, Mun Fei Yam
Previous studies have demonstrated that 3'-hydroxy-5,6,7,4'-tetramethoxyflavone (TMF) content in Orthosiphon stamineus fractions correlate with its vasorelaxation activity. Even with the availability of previous studies, there is still very little information on the vasorelaxation effect of TMF, and few scientific studies have been carried out. Therefore, the present study was designed to investigate the vasorelaxation activity and mechanism of action of the TMF. The vasorelaxation activity and the underlying mechanisms of TMF were evaluated on thoracic aortic rings isolated from Sprague Dawley rats...
March 19, 2018: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/29513344/antioxidant-activity-and-inhibitory-effects-of-2-hydroxy-3-methylcyclopent-2-enone-isolated-from-ribose-histidine-maillard-reaction-products-on-aldose-reductase-and-tyrosinase
#11
Seung Hwan Hwang, Zhiqiang Wang, Hong-Won Suh, Soon Sung Lim
This study aimed to better understand the functional properties of ribose and 20 amino acid Maillard reaction products (MRPs). The ABTS+ radical scavenging ability of the ribose-20 amino acid MRPs was evaluated. Among the MRPs, ribose-histidine MRPs (RH-MRPs) showed the highest inhibitory activities on the ABTS+ radical scavenging ability, aldose reductase (AR), and tyrosinase compared to other MRPs. Functional compounds with antioxidant and AR inhibitory activities have been recognized as an important strategy in the prevention and treatment of diabetic complications, and the search for tyrosinase inhibitors is important for the treatment of hyperpigmentation, development of skin-whitening agents, and use as preservatives in the food industry...
March 7, 2018: Food & Function
https://www.readbyqxmd.com/read/29498276/kinetic-studies-of-copolymerization-of-cyclohexene-oxide-with-co-2-by-a-diamino-bis-phenolate-chromium-iii-complex
#12
Kaijie Ni, Christopher M Kozak
A diamino-bis(phenolate) chromium(III) complex, CrCl(THF)[L], 1, where [L] = dimethylaminoethylamino-N,N-bis(2-methylene-4,6-tert-butylphenolate), has been synthesized in high yield and characterized by MALDI-TOF mass spectrometry, elemental analysis, UV-vis spectroscopy and single crystal X-ray diffraction. This complex combined with 4-dimethylaminopyridine (DMAP) or bis(triphenylphosphoranylidene)ammonium chloride or azide salts (PPNCl or PPNN3 ) shows improved activity over previously reported amine-bis(phenolate) chromium(III) complexes for copolymerization of cyclohexene oxide (CHO) and CO2 to yield poly(cyclohexene) carbonate (PCHC)...
March 2, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29459301/effect-of-small-molecules-on-the-phase-behavior-and-coacervation-of-aqueous-solutions-of-poly-diallyldimethylammonium-chloride-and-poly-sodium-4-styrene-sulfonate
#13
Shuyue Huang, Mengmeng Zhao, Mahesh B Dawadi, Yuhang Cai, Yakov Lapitsky, David A Modarelli, Nicole S Zacharia
HYPOTHESIS: Complex coacervates are capable of easily partitioning solutes within them based on relative affinities of solute-water and solute-polyelectrolyte pairs, as the coacervate phase has low surface tension with water, facilitating the transport of small molecules into the coacervate phase. The uptake of small molecules is expected to influence the physicochemical properties of the complex coacervate, including the hydrophobicity within coacervate droplets, phase boundaries of coacervation and precipitation, solute uptake capacity, as well as the coacervate rheological properties...
February 9, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29450982/application-of-off-line-two-dimensional-high-performance-countercurrent-chromatography-on-the-chloroform-soluble-extract-of-cuscuta-auralis-seeds
#14
Taewoong Rho, Kee Dong Yoon
In this study, the chloroform-soluble extract of C. auralis was separated successfully using off-line two-dimensional high-performance countercurrent chromatography, yielding a γ-pyrone, two alkaloids, a flavonoid and four lignans. The first-dimensional countercurrent separation using a methylene chloride/methanol/water (11:6:5, v/v/v) system yielded three sub-fractions (fractions I-III). The second-dimensional countercurrent separations, conducted on fractions I-III using n-hexane/ethyl and acetate/methanol/acetic acid (5:5:5:5:0, 3:7:3:7:0 and 1:9:1:9:0...
February 16, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29433031/peroxymonosulfate-base-process-in-saline-wastewater-treatment-the-fight-between-alkalinity-and-chloride-ions
#15
Fei Yang, Ying Huang, Changling Fang, Ying Xue, Luoyan Ai, Jianshe Liu, Zhaohui Wang
Both Cl- and base can affect PMS activation to produce reactive chlorine or oxygen species, but the overall effects of chloride on this emerging PMS/base technology in saline wastewater treatment are unknown. Here effectiveness of PMS/base, PMS/Cl- and PMS/base/Cl- is compared with a gradient concentration of chloride and alkalinity, by probing the degradation of methylene blue (MB). Both PMS/base and PMS/Cl- systems can rapidly degrade MB due to the generation of singlet oxygen and reactive chlorine, respectively...
February 6, 2018: Chemosphere
https://www.readbyqxmd.com/read/29368246/concomitant-alteration-in-number-and-affinity-of-p2x-and-muscarinic-receptors-are-associated-with-bladder-dysfunction-in-early-stage-of-diabetic-rats
#16
Tsuyoshi Yoshizawa, Yukio Hayashi, Akira Yoshida, Shohei Yoshida, Yoshihiko Ito, Kenya Yamaguchi, Shizuo Yamada, Satoru Takahashi
OBJECTIVES: To investigate time course of bladder dysfunction and concurrent changes in number and affinity of the muscarinic and P2X receptor in the early stage of streptozotocin (STZ)-induced diabetic rats. MATERIALS AND METHODS: Diabetic rats were prepared by the intraperitoneal injection of 50 mg/kg of STZ to 7-week-old female Wistar rats. We performed recording of 24-h voiding behavior and cystometry at 1, 4, 8, and 12 weeks after the induction of diabetes...
January 24, 2018: International Urology and Nephrology
https://www.readbyqxmd.com/read/29339078/analytical-and-pre-analytical-performance-characteristics-of-a-novel-cartridge-type-blood-gas-analyzer-for-point-of-care-and-laboratory-testing
#17
Matthijs Oyaert, Tom Van Maerken, Silke Bridts, Silvi Van Loon, Heleen Laverge, Veronique Stove
BACKGROUND: Point-of-care blood gas test results may benefit therapeutic decision making by their immediate impact on patient care. We evaluated the (pre-)analytical performance of a novel cartridge-type blood gas analyzer, the GEM Premier 5000 (Werfen), for the determination of pH, partial carbon dioxide pressure (pCO2 ), partial oxygen pressure (pO2 ), sodium (Na+ ), potassium (K+ ), chloride (Cl- ), ionized calcium (i Ca2+ ), glucose, lactate, and total hemoglobin (tHb). METHODS: Total imprecision was estimated according to the CLSI EP5-A2 protocol...
March 2018: Clinical Biochemistry
https://www.readbyqxmd.com/read/29232146/switchable-photoacoustic-intensity-of-methylene-blue-via-sodium-dodecyl-sulfate-micellization
#18
Junxin Wang, Ching-Yu Lin, Colman Moore, Anamik Jhunjhunwala, Jesse V Jokerst
The interaction between methylene blue (MB) and sodium dodecyl sulfate (SDS) has been widely studied spectroscopically, but details about their interactions remain unclear. Here, we combined photoacoustic (PA) imaging with nanoparticle tracking analysis (NTA) and spectroscopy to further elucidate this interaction. PA imaging of 0.05 mM MB showed a 492-fold increase in intensity upon the addition of 3.47 mM SDS. Higher concentrations above SDS's critical micelle concentration (CMC) at 8.67 mM decreased the PA intensity by 54 times...
January 9, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29213257/bacterial-community-dynamics-in-dichloromethane-contaminated-groundwater-undergoing-natural-attenuation
#19
Justin Wright, Veronica Kirchner, William Bernard, Nikea Ulrich, Christopher McLimans, Maria F Campa, Terry Hazen, Tamzen Macbeth, David Marabello, Jacob McDermott, Rachel Mackelprang, Kimberly Roth, Regina Lamendella
The uncontrolled release of the industrial solvent methylene chloride, also known as dichloromethane (DCM), has resulted in widespread groundwater contamination in the United States. Here we investigate the role of groundwater bacterial communities in the natural attenuation of DCM at an undisclosed manufacturing site in New Jersey. This study investigates the bacterial community structure of groundwater samples differentially contaminated with DCM to better understand the biodegradation potential of these autochthonous bacterial communities...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29185178/vasorelaxant-activities-and-the-underlying-pharmacological-mechanisms-of-gynura-procumbens-merr-leaf-extracts-on-rat-thoracic-aorta
#20
Zafar Iqbal, Idris Bello, Mohd Zaini Asmawi, Majed Ahmed Al-Mansoub, Ashfaq Ahmad, Qaiser Jabeen, Yam Mun Fei
Previous studies have investigated the cardiovascular activity of Gynura procumbens Merr. single-solvent extracts. The objective of this study was to evaluate the in vitro vasorelaxant properties and the underlying pharmacological mechanisms of serial extracts and fractions of Gynura procumbens (GP). The leaves of GP were serially extracted with petroleum ether, chloroform, methanol and water using the maceration method. Suspended aortic ring preparations were pre-contracted with phenylephrine (PE 1 µM), followed by cumulative addition of GP extracts (0...
November 28, 2017: Inflammopharmacology
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