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https://www.readbyqxmd.com/read/28627214/efectos-del-t%C3%A3-verde-y-su-contenido-de-galato-de-epigalocatequina-egcg-sobre-el-peso-corporal-y-la-masa-grasa-en-humanos-una-revisi%C3%A3-n-sistem%C3%A3-tica
#1
Lucía Cristina Vázquez Cisneros, Patricia López-Uriarte, Antonio López-Espinoza, Mónica Navarro Meza, Ana Cristina Espinoza-Gallardo, Martha Beatriz Guzmán Aburto
La prevalencia e incidencia del sobrepeso y la obesidad continúan en aumento a nivel mundial, así como las enfermedades relacionadas con estas condiciones. Ello se atribuye a un incremento en la ingesta de energía y una disminución en el gasto de la misma. El consumo de té verde se ha relacionado con una reducción en la grasa y el peso corporal. Sin embargo, las investigaciones realizadas con el té verde han sido muy diversas. Esta revisión sistemática explora las investigaciones que se han realizado con té verde y su contenido de galato de epigalocatequina (EGCG) evaluando su efecto sobre la grasa y el peso corporal en humanos...
June 5, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/28627182/factores-predictores-de-hipertrigliceridemia-en-pacientes-hospitalizados-con-nutrici%C3%A3-n-parenteral-total
#2
Maria Julia Ocón Bretón, Ana Isabel Ilundain Gonzalez, Jara Altemir Trallero, Ana Agudo Tabuenca, José Antonio Gimeno Orna
Introducción:la nutrición parenteral total (NPT) es una modalidad de soporte nutricional indicada en aquellas situaciones donde el enfermo no puede cubrir sus requerimientos nutricionales por vía enteral. A pesar de ser una terapia segura y efi caz, no está exenta de complicaciones, entre las que cabe destacar, por su frecuencia, la hipertrigliceridemia. La etiología de esta complicación metabólica es compleja y multifactorial.Objetivos: el objetivo de este trabajo fue determinar los factores de riesgo asociados al desarrollo de hipertrigliceridemia en pacientes adultos hospitalizados no críticos que reciben NPT a corto plazo y evaluar el efecto que una emulsión lipídica enriquecida en ácidos grasos poliinsaturados omega-3 ejerce sobre esta complicación metabólica...
June 5, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/28602503/analysis-using-size-exclusion-chromatography-of-poly-n-isopropyl-acrylamide-using-methanol-as-an-eluent
#3
Thomas Swift, Richard Hoskins, Richard Telford, Richard Plenderleith, David Pownall, Stephen Rimmer
Size Exclusion Chromatography is traditionally carried out in either aqueous or non-polar solvents. A system to present molar mass distributions of polymers using methanol as a mobile phase is presented. This is shown to be a suitable system for determining the molar mass distributions poly(N-isopropylacrylamide)s (PNIPAM); a polymer class that is often difficult to analyze by size exclusion chromatography. DOSY NMR was used to provide intrinsic viscosity data that was used in conjunction with a viscometric detector to provide absolute calibration...
May 25, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28602187/desi-ms-imaging-and-nmr-spectroscopy-to-investigate-the-influence-of-biodiesel-in-the-structure-of-commercial-rubbers
#4
Lorena M A Silva, Elenilson G Alves Filho, André J Simpson, Marcos R Monteiro, Elaine Cabral, Demian Ifa, Tiago Venâncio
Biodiesel has been introduced as an energetic matrix in several countries around the world. However, the affinity of biodiesel with the components of petrodiesel engines is a growing concern. In order to obtain information regarding the effect of biodiesel on the rubber structure, nuclear magnetic resonance technics under a new technology named as comprehensive multiphase (CMP NMR) and the imaging through desorption electrospray ionization mass spectrometry (DESI-MS imaging) were used. The (1)H CMP-DOSY NMR showed the entrapped fuel into the rubber cavities, which the higher constraint caused by the rubber structure is related to the smaller diffusion coefficient...
October 1, 2017: Talanta
https://www.readbyqxmd.com/read/28590559/dosy-analysis-of-%C3%AE-m-analytes-resolving-dilute-mixtures-by-sabre-hyperpolarization
#5
Indrek Reile, Ruud L E G Aspers, Jean-Max Tyburn, James G Kempf, Martin C Feiters, Floris P J T Rutjes, Marco Tessari
DOSY is an NMR technique that resolves resonances according to analytes' diffusion coefficients. It has found use in correlating NMR signals and estimating the number of components in mixtures. Applications of DOSY in dilute mixtures are, however, held back by excessive measurement times. We demonstrate herein, how the enhanced NMR sensitivity provided by SABRE hyperpolarization allows DOSY of low-µM mixtures, thus reducing the concentration requirements by at least 100-fold.
June 7, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28562035/ligand-binding-constants-to-lithium-hexamethyldisilazide-determined-by-diffusion-ordered-nmr-spectroscopy
#6
Onkei Tai, Russell Hopson, Paul G Williard
We report the direct measurement of ligand-binding constants of organolithium complexes using a (1)H NMR/diffusion-ordered NMR spectroscopy (DOSY) titration technique. Lithium hexamethyldisilazide complexes with ethereal and ester donor ligands (THF, diethyl ether, MTBE, THP, tert-butyl acetate) are characterized using (1)H NMR and X-ray crystallography. Their aggregation and solvation states are confirmed using diffusion coefficient-formula weight correlation analysis, and the (1)H NMR/DOSY titration technique is applied to obtain their binding constants...
June 8, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28514507/hydrogen-bond-involving-cavity-nh-protons-drives-supramolecular-oligomerization-of-amido-corroles
#7
Daniel T Gryko, Rafał Orłowski, Mariusz Tasior, Barbara Ventura, Olga Staszewska-Krajewska, Wojciech Schilf, Michał Cyrański, Łukasz Dobrzycki
Trans-A2B-Corroles with amide substituents at different positions versus the macrocyclic core have been synthesized. Their self-organizing properties have been comprehensively evaluated both in solid-state and in solution. The rigid arrangement of the amide functionality with the corrole ring led to the formation of strong intramolecular interactions and precluded intermolecular interactions. Replacement of sterically hindered C6F5 substituents at positions 5 and 15 with smaller electron-withdrawing CO2Me groups resulted in significant changes in the self-assembly pattern...
May 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28510440/fundamental-characterization-of-the-micellar-self-assembly-of-sophorolipid-esters
#8
Amanda Koh, Katherine Todd, Ezekiel Sherbourne, Richard A Gross
Surfactants are ubiquitous constituents of commercial and biological systems that function based on complex structure-dependent interactions. Sophorolipid (SL) n-alkyl esters (SL-esters) comprise a group of modified naturally derived glycolipids from Candida bombicola. Herein, micellar self-assembly behavior as a function of SL-ester chain length was studied. Surface tensions as low as 31.2 mN/m and critical micelle concentrations (CMCs) as low as 1.1 μM were attained for diacetylated SL-decyl ester (dASL-DE) and SL-octyl ester, respectively...
June 1, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28509541/synthesis-characterization-and-variable-temperature-nmr-studies-of-silver-i-complexes-for-selective-nitrene-transfer
#9
Minxue Huang, Joshua R Corbin, Nicholas S Dolan, Charles G Fry, Anastasiya I Vinokur, Ilia A Guzei, Jennifer M Schomaker
An array of silver complexes supported by nitrogen-donor ligands catalyze the transformation of C═C and C-H bonds to valuable C-N bonds via nitrene transfer. The ability to achieve high chemoselectivity and site selectivity in an amination event requires an understanding of both the solid- and solution-state behavior of these catalysts. X-ray structural characterizations were helpful in determining ligand features that promote the formation of monomeric versus dimeric complexes. Variable-temperature (1)H and DOSY NMR experiments were especially useful for understanding how the ligand identity influences the nuclearity, coordination number, and fluxional behavior of silver(I) complexes in solution...
May 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28508392/polyoxometalate-engineered-building-blocks-with-gold-cores-for-the-self-assembly-of-responsive-water-soluble-nanostructures
#10
Yizhan Wang, Manoj Raula, Yifeng Wang, Offer Zeiri, Sourav Chakraborty, Gal Gan-Or, Eyal Gadot, Ira A Weinstock
The controlled assembly of gold nanoparticles (AuNPs) with the size of quantum dots into predictable structures is extremely challenging as it requires the quantitatively and topologically precise placement of anisotropic domains on their small, approximately spherical surfaces. We herein address this problem by using polyoxometalate leaving groups to transform 2 nm diameter gold cores into reactive building blocks with hydrophilic and hydrophobic surface domains whose relative sizes can be precisely tuned to give dimers, clusters, and larger micelle-like organizations...
June 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28507679/-ag115s34-sch2c6h4-t-bu-47-dpph-6-synthesis-crystal-structure-and-nmr-investigations-of-a-soluble-silver-chalcogenide-nanocluster
#11
Sebastian Bestgen, Olaf Fuhr, Ben Breitung, Venkata Sei Kiran Chakravadhanula, Gisela Guthausen, Frank Hennrich, Wen Yu, Manfred M Kappes, Peter W Roesky, Dieter Fenske
With the aim to synthesize soluble cluster molecules, the silver salt of (4-(tert-butyl)phenyl)methanethiol [AgSCH2C6H4(t) Bu] was applied as a suitable precursor for the formation of a nanoscale silver sulfide cluster. In the presence of 1,6-(diphenylphosphino)hexane (dpph), the 115 nuclear silver cluster [Ag115S34(SCH2C6H4(t) Bu)47(dpph)6] was obtained. The molecular structure of this compound was elucidated by single crystal X-ray analysis and fully characterized by spectroscopic techniques. In contrast to most of the previously published cluster compounds with more than a hundred heavy atoms, this nanoscale inorganic molecule is soluble in organic solvents, which allowed a comprehensive investigation in solution by UV-Vis spectroscopy and one- and two-dimensional NMR spectroscopy including (31)P/(109)Ag-HSQC and DOSY experiments...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28504171/tuneable-catechin-functionalisation-of-carbohydrate-polymers
#12
Susan Oliver, Aziidah Jofri, Donald S Thomas, Orazio Vittorio, Maria Kavallaris, Cyrille Boyer
In this contribution, we present a strategy to functionalise three natural carbohydrate polymers (dextran - a neutral polymer, sodium alginate - an anionic polymer and chitosan - a cationic polymer) with catechin with excellent degrees of functionality. In a first step, the carbohydrate polymers were oxidised by sodium periodate to yield aldehyde functionalised carbohydrate polymers. The presence of aldehyde groups was exploited to attach catechin by an acid catalysed nucleophilic reaction. The degree of catechin functionalisation could be easily tuned by varying the acid concentration in the reaction mixture, achieving catechin functionalisation levels of up to 48% for dextran aldehyde catechin, 35% for chitosan-aldehyde-catechin and 22% for sodium alginate aldehyde catechin...
August 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28492211/raised-adenosine-deaminase-in-the-cerebrospinal-fluid-a-tool-for-the-diagnosis-of-tuberculous-meningitis-in-developing-countries
#13
Purti A Saini, Preeti R Chakrabarti, Dosi Shilpi, Gambhir Shankhini, Gupta Priyanka, Tignath Gargi
CONTEXT: The rapid diagnosis followed by the early treatment of tuberculous meningitis (TBM) is important in preventing fatal outcomes. The mainstay of diagnosis lies in cerebrospinal fluid (CSF) analysis, radiological investigations, and clinical findings. AIM: The present study was conducted to determine the efficacy, sensitivity, and specificity of raised adenosine deaminase (ADA) level in CSF to differentiate TBM from non-TBM cases as a rapid, cost-effective, and noninvasive test...
January 2017: Nigerian Postgraduate Medical Journal
https://www.readbyqxmd.com/read/28491062/a-kinetic-study-of-cd83-reveals-an-upregulation-and-higher-production-of-scd83-in-lymphocytes-from-pregnant-mice
#14
Katrin Regina Helene Packhäuser, Gleyder Roman-Sosa, Jens Ehrhardt, Diana Krüger, Marek Zygmunt, Damián Oscar Muzzio
For the normal development of pregnancy, a balance between immune tolerance and defense is crucial. However, the mechanisms mediating such a balance are not fully understood. CD83 is a transmembrane protein whose expression has been linked to anti-inflammatory functions of T and B cells. The soluble form of CD83, released by cleavage of the membrane-bound protein, has strong anti-inflammatory properties and was successfully tested in different mouse models. It is assumed that this molecule contributes to the establishment of immune tolerance...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28489394/surface-engineering-of-ultrathin-gold-nanowires-tailored-self-assembly-and-enhanced-stability
#15
El Said A Nouh, Edwin A Baquero, Lise-Marie Lacroix, Fabien Delpech, Romuald Poteau, Guillaume Viau
Gold nanowires with a mean diameter of 1.7 nm were synthesized by reduction of HAuCl4 in a solution of oleylamine (OY) in hexane. A bilayer of oleylammonium chloride/oleylamine at the surface of the raw nanowires was evidenced by NMR and diffusion ordered spectroscopy (DOSY) experiments. After washing a monolayer of oleylammonium chloride remained at the surface of the nanowires. The oleylammonium chloride layer could be progressively replaced by a phosphine shell as evidenced with NMR and DOSY experiments, which are in good agreement with the adsorption energies given by density functional theory calculations...
June 6, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28489257/unsaturated-long-chain-fatty-acids-are-preferred-ferritin-ligands-enhancing-iron-biomineralization
#16
Serena Zanzoni, Katiuscia Pagano, Mariapina D'Onofrio, Michael Assfalg, Silvia Ciambellotti, Caterina Bernacchioni, Paola Turano, Silvio Aime, Laura Ragona, Henriette Molinari
Ferritin is a ubiquitous nanocage protein, which can accommodate up to thousands of iron atoms inside its cavity. Besides its iron storage function, a new role as fatty acid binder has been proposed for this protein. The interaction of apo horse spleen ferritin (HoSF) with a variety of lipids has been here investigated through NMR ligand-based experiments, to provide new insights into the mechanism of ferritin/lipid interactions and the link with iron mineralization. 1D DOSY and STD NMR experiments established a stronger interaction of ferritin with unsaturated fatty acids with respect to saturated fatty acids, detergents and bile acids...
May 10, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28466908/exploring-the-solid-state-and-solution-structural-chemistry-of-the-utility-amide-potassium-hexamethyldisilazide-khmds
#17
Ana I Ojeda-Amador, Antonio J Martínez-Martínez, Gemma M Robertson, Stuart D Robertson, Alan R Kennedy, Charles T O'Hara
The structural chemistry of eleven donor complexes of the important Brønsted base potassium 1,1,1,3,3,3-hexamethyldisilazide (KHMDS) has been studied. Depending on the donor, each complex adopted one of five general structural motifs. Specifically, in this study the donors employed were toluene (to give polymeric 1 and dimeric 2), THF (polymeric 3), N,N,N',N'-tetramethylethylenediamine (TMEDA) (dimeric 4), (R,R)-N,N,N',N'-tetramethyl-1,2-diaminocyclohexane [(R,R)-TMCDA] (dimeric 5), 12-crown-4 (dimeric 6), N,N,N',N'-tetramethyldiaminoethyl ether (TMDAE) (tetranuclear dimeric 8 and monomeric 10), N,N,N',N'',N''-pentamethyldiethylenetriamine (PMDETA) (tetranuclear dimeric 7), tris[2-dimethyl(amino)ethyl]amine (Me6TREN) (tetranuclear dimeric 9) and tris{2-(2-methoxyethoxy)ethyl}amine (TMEEA) (monomeric 11)...
May 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28451098/neutral-iodotriazoles-as-scaffolds-for-stable-halogen-bonded-assemblies-in-solution
#18
Leonardo Maugeri, Julia Asencio-Hernández, Tomáš Lébl, David B Cordes, Alexandra M Z Slawin, Marc-André Delsuc, Douglas Philp
The halogen bond (XB) donor properties of neutral 1,4-diaryl-5-iodo-1,2,3-triazoles are explored using a combination of computational and experimental results and are shown to be competitive in halogen bonding efficiency with the classic pentafluoroiodobenzene XB donor. The SNAr reactivity of these donors permits the facile assembly of an iodotriazole functionalised with a 3-oxypyridine XB acceptor, thus generating a molecular scaffold capable of undergoing dimerisation through the formation of two halogen bonds...
October 1, 2016: Chemical Science
https://www.readbyqxmd.com/read/28446127/sample-size-and-power-determination-when-limited-preliminary-information-is-available
#19
Christine E McLaren, Wen-Pin Chen, Thomas D O'Sullivan, Daniel L Gillen, Min-Ying Su, Jeon H Chen, Bruce J Tromberg
BACKGROUND: We describe a novel strategy for power and sample size determination developed for studies utilizing investigational technologies with limited available preliminary data, specifically of imaging biomarkers. We evaluated diffuse optical spectroscopic imaging (DOSI), an experimental noninvasive imaging technique that may be capable of assessing changes in mammographic density. Because there is significant evidence that tamoxifen treatment is more effective at reducing breast cancer risk when accompanied by a reduction of breast density, we designed a study to assess the changes from baseline in DOSI imaging biomarkers that may reflect fluctuations in breast density in premenopausal women receiving tamoxifen...
April 26, 2017: BMC Medical Research Methodology
https://www.readbyqxmd.com/read/28430280/potassium-complexes-supported-by-monoanionic-tetradentate-amino-phenolate-ligands-synthesis-structure-and-catalysis-in-the-ring-opening-polymerization-of-rac-lactide
#20
Chenhui Yao, Yang Yang, Shaoan Xu, Haiyan Ma
A series of potassium complexes bearing monoanionic tetradentate amino-phenolate ligands, [LK]2 (L = {(2-R(1))C6H4CH2N[(CH2)2R(2)]CH2(4-R(4)-6-R(3))C6H2O-}, R(1) = NMe2, R(2) = NEt2, R(3) = CPh3, R(4) = Me (1); R(1) = R(2) = NEt2, R(3) = CPh3, R(4) = Me (2); R(1) = NMe2, R(2) = NEt2, R(3) = R(4) = cumyl (4); R(1) = R(2) = OMe, R(3) = (t)Bu, R(4) = Me (6); L = (2-NMe2)C6H4CH2N[[CH2-(S)-1-butylpyrrolidinyl]CH2(4-Me-6-CPh3)C6H2O-] (3)), have been synthesized via reactions of KN(SiMe3)2 and 1 equiv. of the corresponding aminophenols...
May 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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