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https://www.readbyqxmd.com/read/28495020/uplc-ms-ms-method-for-determination-of-sofosbuvir-in-human-plasma
#1
B M Gandhi, A L Rao, J V Rao
INTRODUCTION: A sensitive and rapid method for quantitation of Sofosbuvir in human plasma has been established using ultra performance liquid chromatography-electrospray ionization tandem mass spectrometry (UPLC-ESI-MS/MS). MATERIALS AND METHODS: Sofosbuvir d3 was used as an internal standard. Sofosbuvir and internal standard in plasma sample were extracted using ethyl acetate (liquid liquid extraction). A centrifuged upper layer was then evaporated and reconstituted with the mobile phase of 0...
May 8, 2017: Annales Pharmaceutiques Françaises
https://www.readbyqxmd.com/read/28492876/pulmonary-embolism-and-deep-venous-thrombosis-in-patients-hospitalized-with-syncope-a-multicenter-cross-sectional-study-in-toronto-ontario-canada
#2
Amol A Verma, Hassan Masoom, Shail Rawal, Yishan Guo, Fahad Razak
No abstract text is available yet for this article.
May 8, 2017: JAMA Internal Medicine
https://www.readbyqxmd.com/read/28490060/determination-of-flubendiamide-in-honey-at-trace-levels-by-using-solid-phase-extraction-and-liquid-chromatography-coupled-to-quadrupole-time-of-flight-mass-spectrometry
#3
Ana M Ares, Silvia Valverde, José L Bernal, Laura Toribio, María J Nozal, José Bernal
In this study, a new method has been developed to determine flubendiamide in honey using liquid chromatography coupled to a selective mass spectrometry detector (quadrupole-time-of-flight). An efficient sample treatment involving a solid phase extraction with a C18 sorbent was proposed (average analyte recoveries were between 94 and 104%). Chromatographic analysis (9min) was performed on a C18 column (Gemini C18, 50×2.0mm, 3µm, 110Å). The mobile phase consisted of water and acetonitrile, with a flow rate of 0...
October 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28482602/studying-the-silver-nanoparticles-influence-on-thermodynamic-behavior-and-antimicrobial-activities-of-novel-amide-gemini-cationic-surfactants
#4
Samy M Shaban, Ali A Abd-Elaal
Three novels amide Gemini cationic surfactants with various alkyl chains and their silver nanohybrid with silver nanoparticles were synthesized and a confirmation study for surfactant and their nanoparticles formation has been established using IR, (1)HNMR, TEM and UV-Vis spectroscopy. The surface-active properties of these surfactants and their nanoform were investigated through surface tension and electrical conductivity measurements and a comparative study has been established. The thermodynamic parameters of micellization and adsorption were assessed at temperatures range from 25 to 65°C...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28482190/gemini-pyridinium-amphiphiles-for-the-synthesis-and-stabilization-of-gold-nanoparticles-for-drug-delivery
#5
María E Alea-Reyes, Asensio González, Ana C Calpena, David Ramos-López, Joaquín de Lapuente, Lluïsa Pérez-García
HYPOTHESIS: Gemini pyridinium-based amphiphiles can play a triple role as: gold nanoparticles (AuNPs) synthesis facilitator, particle stabilizer and anion recognition centre. The so formed nanoparticles should be able to bind and release anionic drugs. EXPERIMENTS: We describe (a) Synthesis, by a phase transfer method, of both new organic media and water soluble AuNPs using gemini-type surfactants based on bis-pyridinium salts as ligands, acting as transfer agents into organic media and also as nanoparticle stabilizers, (b) Examination of their stability in solution, (c) Chemical and physical characterization of the nanoparticles, (d) Toxicity data concerning both the bis-pyridinium ligands and the bis-pyridinium coated nanoparticles, and (e) Study of their ability for delivering anionic pharmaceuticals such as ibuprofen and piroxicam...
April 21, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28457667/extracorporeal-shock-wave-lithotripsy-eswl-monotherapy-in-children-predictors-of-successful-outcome
#6
G Alsagheer, M S Abdel-Kader, A M Hasan, O Mahmoud, O Mohamed, A Fathi, M Abass, A Abolyosr
INTRODUCTION AND OBJECTIVES: Although extracorporeal shock wave lithotripsy (ESWL) is the first choice for pediatric renal calculi <2 cm, the success rate after the first session is low. This is in contrast to other minimally invasive procedures like percutanous nephrolithotomy (PCNL) and retrograde intrarenal surgery (RIRS), which have higher rates of success. Therefore, the present study sought to identify predictors of success after one session of ESWL. PATIENTS AND METHODS: A prospective study including 100 children with renal stone burden <2 cm who underwent ESWL at the present institution...
April 18, 2017: Journal of Pediatric Urology
https://www.readbyqxmd.com/read/28454034/immobilization-of-phenanthrene-onto-gemini-surfactant-modified-sepiolite-at-solid-aqueous-interface-equilibrium-thermodynamic-and-kinetic-studies
#7
Shan Zhao, Guohe Huang, Sen Mu, Chunjiang An, Xiujuan Chen
The immobilization of phenanthrene from aqueous phase onto natural and gemini surfactant modified sepiolite was investigated with respect to contact time, pH, ionic strength and temperature. The surface modification was examined through FT-IR characterization, SEM technique, and the thermogravimetric analysis. The maximum sorption capacity of phenanthrene on modified sepiolite was 95.15μgg(-1) with initial PHE concentration 1.0mgL(-1), temperature 293K, pH7, and ionic strength 1M. The corresponding PHE removal efficiency was higher than 95%...
April 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28443331/coupling-between-the-dynamics-of-water-and-surfactants-in-lyotropic-liquid-crystals
#8
Jesse G McDaniel, Arun Yethiraj
Bilayers composed of lipid or surfactant molecules are central to biological membranes and lamellar lyotropic liquid crystalline (LLC) phases. Common to these systems are phases that exhibit either ordered or disordered packing of the hydrophobic tails. In this work, we study the impact of surfactant ordering, i.e., disordered Lα and ordered Lβ LLC phases, on the dynamics of water and sodium ions in the lamellar phases of dicarboxylate gemini surfactants. We study the different phases at identical hydration levels by changing the length of the hydrophobic tails; surfactants with shorter tails form Lα phases and those with longer tails form Lβ phases...
May 4, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28439884/the-home-environment-shapes-emotional-eating
#9
Moritz Herle, Alison Fildes, Frühling Rijsdijk, Silje Steinsbekk, Clare Llewellyn
Emotional overeating (EOE) is the tendency to eat more in response to negative emotions; its etiology in early life is unknown. We established the relative genetic and environmental influences on EOE in toddlerhood and early childhood. Data were from Gemini, a population-based cohort of 2,402 British twins born in 2007. EOE was measured using the "emotional overeating" scale of the Child Eating Behavior Questionnaire (CEBQ) at 16 months and 5 years. A longitudinal quantitative genetic model established that genetic influences on EOE were minimal; on the other hand, shared environmental influences explained most of the variance...
April 25, 2017: Child Development
https://www.readbyqxmd.com/read/28428717/minimally-invasive-surgery-for-gastric-cancer-a-comparison-between-robotic-laparoscopic-and-open-surgery
#10
Amilcare Parisi, Daniel Reim, Felice Borghi, Ninh T Nguyen, Feng Qi, Andrea Coratti, Fabio Cianchi, Maurizio Cesari, Francesca Bazzocchi, Orhan Alimoglu, Johan Gagnière, Graziano Pernazza, Simone D'Imporzano, Yan-Bing Zhou, Juan-Santiago Azagra, Olivier Facy, Steven T Brower, Zhi-Wei Jiang, Lu Zang, Arda Isik, Alessandro Gemini, Stefano Trastulli, Alexander Novotny, Alessandra Marano, Tong Liu, Mario Annecchiarico, Benedetta Badii, Giacomo Arcuri, Andrea Avanzolini, Metin Leblebici, Denis Pezet, Shou-Gen Cao, Martine Goergen, Shu Zhang, Giorgio Palazzini, Vito D'Andrea, Jacopo Desiderio
AIM: To investigate the role of minimally invasive surgery for gastric cancer and determine surgical, clinical, and oncological outcomes. METHODS: This is a propensity score-matched case-control study, comparing three treatment arms: robotic gastrectomy (RG), laparoscopic gastrectomy (LG), open gastrectomy (OG). Data collection started after sharing a specific study protocol. Data were recorded through a tailored and protected web-based system. Primary outcomes: harvested lymph nodes, estimated blood loss, hospital stay, complications rate...
April 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28415837/effects-of-a-spacer-on-the-phase-behavior-of-gemini-surfactants-in-ethanolammonium-nitrate
#11
Qintang Li, Meihuan Yao, Xiu Yue, Xiao Chen
The aggregation behavior of quaternary ammonium gemini surfactants (12-s-12) in a protic ionic liquid, ethanolammonium nitrate (EOAN), was investigated by small-angle X-ray scattering, freeze-fracture transmission electron microscopy, polarized optical microscopy, and rheological measurements. The rarely reported nonaqueous two phases in the ionic liquid were observed at lower 12-s-12 concentrations. The upper phase was composed of micelles, whereas only the surfactant unimers or multimers were detected in the low phase...
April 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28409852/tandem-mass-spectrometric-analysis-of-novel-peptide-modified-gemini-surfactants-used-as-gene-delivery-vectors
#12
Mays Al-Dulaymi, Anas El-Aneed
Diquaternary ammonium gemini Surfactants have emerged as effective gene delivery vectors. A novel series of eleven peptide-modified compounds was synthesized, showing promising results in delivering genetic materials. The purpose of this work is to elucidate the tandem mass spectrometric (MS/MS) dissociation behaviour of these novel molecules establishing a generalized MS/MS fingerprint. Exact mass measurements were achieved using a hybrid quadrupole orthogonal time-of-flight mass spectrometer (QqToF-MS) and a multi-stage tandem mass spectrometric analysis was conducted using a triple quadrupole-linear ion trap mass spectrometer (QqQLIT-MS)...
April 14, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28407589/transport-of-anionic-azo-dyes-from-aqueous-solution-to-gemini-surfactant-modified-wheat-bran-synchrotron-infrared-molecular-interaction-and-adsorption-studies
#13
Yan Zhang, Guohe Huang, Chunjiang An, Xiaying Xin, Xia Liu, Maya Raman, Yao Yao, Wenxia Wang, Mukesh Doble
From the view of economic efficiency and technology sustainability, biomass adsorbent has a high potential for pollution control. In the present study, the performance of gemini 12-2-12 surfactant-modified wheat bran (MWB) for the removal of anionic azo dyes from aqueous solution was investigated. A new insight was gained into the modification mechanism through synchrotron-assisted infrared analysis and molecular interaction simulation. The equilibrium and kinetic studies for the adsorption of Acid Red 18 (AR-18), Acid Orange 7 (AO-7) and Acid Black 1 (AB-1) on MWB were conducted...
October 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28393936/effect-of-counterions-on-the-micellization-and-monolayer-behaviour-of-cationic-gemini-surfactants
#14
M S Islam, S M Shortall, G M Mekhail, S P Callender, O Madkhali, Z Bharwani, D Ayyash, K Kobernyk, S D Wettig
The effect of various inorganic and organic counterions on the aggregation behavior of gemini surfactants was examined to investigate the dominant influence of the anions on their micellization and aggregation behavior. This study included eight ethanediyl-α,ω-bis-(dimethylhexadecylammonium) gemini surfactants (GS, also known as 16-2-16) having counterions of chloride (Cl(-)), bromide (Br(-)), malate, tartrate, adenosine monophosphate (AMP), guanosine monophosphate (GMP), cytidine monophosphate (CMP), and uridine monophosphate (UMP)...
May 3, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28387417/microscale-coiling-in-bis-imidazolium-supramolecular-hydrogel-fibres-induced-by-the-release-of-a-cationic-serine-protease-inhibitor
#15
David Limón, Claire Jiménez-Newman, Ana C Calpena, Arántzazu González-Campo, David B Amabilino, Lluïsa Pérez-García
Gels formed by a gemini dicationic amphiphile incorporate a serine protease inhibitor, which could be used in a new approach to the treatment of Rosacea, within the fibres as well as in the space between them, affecting a number of gel properties but most importantly inducing remarkable fibre coiling at the microscopic level as a result of drug release from the gel. Drug release and skin permeation experiments show its potential for topical administration.
April 7, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28369329/vedolizumab-induces-long-term-mucosal-healing-in-patients-with-crohn-s-disease-and-ulcerative-colitis
#16
Maja Noman, Marc Ferrante, Raf Bisschops, Gert De Hertogh, Karolien Van den Broeck, Karen Rans, Paul J Rutgeerts, Séverine Vermeire, Gert Van Assche
Introduction.: Vedolizumab has proven efficacy in IBD, but long term mucosal healing in Crohn's disease (CD), as well as the incidence of colorectal neoplasia in IBD, among patients treated with vedolizumab have not been studied. We aimed to document mucosal healing and to explore the risk of colorectal neoplasia with vedolizumab maintenance therapy. Methods.: Surveillance colonoscopy was prospectively scheduled for patients with longstanding UC or CD at a tertiary referral center in the open label extension phase (vedolizumab 300 mg IV q 4 wks) of the Gemini studies (GEMINI LTS, study number NCT00790933)...
March 24, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28359893/spectroscopic-studies-on-the-gemini-surfactant-mediated-refolding-of-human-serum-albumin
#17
Nuzhat Gull, Javed Masood Khan, Rukhsana, Rizwan Hassan Khan
Refolding of guanidinium hydrochloride (GdCl) denatured human serum albumin (HSA) using a combination of cationic gemini surfactants; pentanediyl-α,ω-bis(cetyldimethylammonium bromide) (C16H33(CH3)2N(+)-(CH2)5-N(+)(CH3)2C16H33)2Br(-) designated as G5 and methyl- β-cyclodextrin, is attempted in the present study. The studies were carried out in an aqueous medium (pH 7.4) using dynamic light scattering (DLS), circular dichroism (CD) and fluorescence spectroscopy. A careful study of the DLS data indicates that against the hydrodynamic radius (Rh) of 3...
March 27, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28333288/exposure-efficacy-relationships-for-vedolizumab-induction-therapy-in-patients-with-ulcerative-colitis-or-crohn-s-disease
#18
Maria Rosario, Jonathan L French, Nathanael L Dirks, Serap Sankoh, Asit Parikh, Huyuan Yang, Silvio Danese, Jean-Frédéric Colombel, Michael Smyth, William J Sandborn, Brian G Feagan, Walter Reinisch, Bruce E Sands, Miguel Sans, Irving Fox
Background and Aims: A positive relationship between vedolizumab trough serum concentrations and clinical outcomes in patients with ulcerative colitis (UC) or Crohn's disease (CD) has been reported. Here we further explore exposure-efficacy relationships for vedolizumab induction therapy in post hoc analyses of GEMINI study data. Methods: Vedolizumab trough concentrations at Week 6 or 10 were grouped in quartiles and clinical outcome rates calculated. Exposure-efficacy relationships at Week 6 and potential baseline covariate effects were explored using logistic regression and individual predicted cumulative average concentration through Week 6 (Caverage) as exposure measure...
February 17, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28325639/gemini-acs-1-toward-unearthing-the-antithrombotic-therapy-cornerstone-for-acute-coronary-syndromes
#19
Paul A Gurbel, Udaya S Tantry
No abstract text is available yet for this article.
March 17, 2017: Lancet
https://www.readbyqxmd.com/read/28325638/clinically-significant-bleeding-with-low-dose-rivaroxaban-versus-aspirin-in-addition-to-p2y12-inhibition-in-acute-coronary-syndromes-gemini-acs-1-a-double-blind-multicentre-randomised-trial
#20
E Magnus Ohman, Matthew T Roe, P Gabriel Steg, Stefan K James, Thomas J Povsic, Jennifer White, Frank Rockhold, Alexei Plotnikov, Hardi Mundl, John Strony, Xiang Sun, Steen Husted, Michal Tendera, Gilles Montalescot, M Cecilia Bahit, Diego Ardissino, Héctor Bueno, Marc J Claeys, Jose C Nicolau, Jan H Cornel, Shinya Goto, Róbert Gábor Kiss, Ümit Güray, Duk-Woo Park, Christoph Bode, Robert C Welsh, C Michael Gibson
BACKGROUND: Dual antiplatelet therapy (DAPT), aspirin plus a P2Y12 inhibitor, is the standard antithrombotic treatment following acute coronary syndromes. The factor Xa inhibitor rivaroxaban reduced mortality and ischaemic events when added to DAPT, but caused increased bleeding. The safety of a dual pathway antithrombotic therapy approach combining low-dose rivaroxaban (in place of aspirin) with a P2Y12 inhibitor has not been assesssed in acute coronary syndromes. We aimed to assess rivaroxaban 2·5 mg twice daily versus aspirin 100 mg daily, in addition to clopidogrel or ticagrelor (chosen at investigator discretion before randomisation), for patients with acute coronary syndromes started within 10 days after presentation and continued for 6-12 months...
May 6, 2017: Lancet
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