Showing 1-30 of 44 results for "48486"
Toshifumi Miyazawa et al.
Biotechnology letters, 35(4), 625-630 (2012-12-20)
Acylation of (hydroxyalkyl)phenols with vinyl esters by lipase B from Candida antarctica proceeded smoothly in a highly chemoselective manner, affording their alkyl esters exclusively or at least predominantly. The enzyme therefore discriminates between an alcoholic hydroxyl from a phenolic hydroxyl...
U Durán et al.
Bioresource technology, 102(2), 1644-1648 (2010-10-12)
The influence of vinyl acetate (VA) in the methanogenesis was evaluated, by using an upflow anaerobic sludge blanket reactor of 1.5L. The reactor was operated at 33.5 g/L volatile suspended solids to 30±2 °C, a hydraulic residence time of 1...
Vinyl acetate.
IARC monographs on the evaluation of carcinogenic risks to humans, 63, 443-465 (1995-01-01)
B Picquet-Varrault et al.
Environmental science & technology, 44(12), 4615-4621 (2010-05-25)
Vinyl acetate is widely used in industry. It has been classified as a high-production volume (HPV) chemical in the United States. To evaluate its impact on the environment and air quality, its atmospheric reactivity toward the three main tropospheric oxidants...
Anna Piperno et al.
The Journal of organic chemistry, 75(9), 2798-2805 (2010-04-17)
A new template of C-4'-truncated phosphonated nucleosides (TPCOANs) has been obtained in good yields according to two different routes which exploit the reactivity of a phosphonated nitrone. The one-step procedure based on the 1,3-dipolar cycloaddition of a phosphonated nitrone with...
María B Blanco et al.
Environmental science & technology, 46(16), 8817-8825 (2012-07-18)
The products formed from the reactions of OH radicals with vinyl acetate and allyl acetate have been studied in a 1080 L quartz-glass chamber in the presence and absence of NO(x) using in situ FTIR spectroscopy to monitor the reactant...
Ming-Cheng Lin et al.
Journal of biochemical and molecular toxicology, 25(5), 330-339 (2011-06-02)
Enantiomers of cis,cis-decahydro-2-naphthyl-N-n-butylcarbamate show stereo-specific inhibition for acetylcholinesterase and butyrylcholinesterase. For both inhibition reaction, (2S,4aR,8aS)-cis,cis-decahydro-2-naphthyl-N-n- butylcarbamate is more potent than (2R,4aS,8aR)-cis,cis-decahydro-2-naphthyl-N-n-butylcarbamate. Optically pure (2S,4aR,8aS)-(-)- and (2R,4aS,8aR)-(+)-cis,cis-decahydro-2-naphthols are resolved by the porcine pancreatic lipase-catalyzed acetylation of decahydro-2-naphthols with vinyl acetate. Absolute...
Francesco Sasso et al.
Journal of biotechnology, 214, 1-8 (2015-09-02)
Kinetic modelling, molecular modelling, and experimental determination of the initial reaction velocity of lipase-catalyzed alcoholysis were combined to study the effect of the alcohol substrate to catalytic activity. The model system consisted of methanol or ethanol at varying concentrations, vinyl...
Xiadan Luo et al.
Journal of materials science. Materials in medicine, 23(12), 3075-3082 (2012-09-15)
Non-alcoholic steatohepatitis is a burgeoning health problem. To diagnose NASH with magnetic resonance imaging (MRI), an effective contrast agent, a stable suspension of superparamagnetic Fe(3)O(4) nanoparticles, were newly developed. The negatively charged Fe(3)O(4) nanoparticles were coated with positive chitosan (CS)...
Roberto M Risi et al.
Organic letters, 14(4), 1180-1182 (2012-02-07)
A highly atom-economical total synthesis of (+)-patulolide C has been accomplished in three steps from the known (2R)-8-nonyn-2-ol in 49% overall yield and 93% de. A Rh(I)-catalyzed asymmetric hydroformylation (AHF)/ intramolecular Wittig olefination cascade was utilized to set the C4-hydroxyl...
Delia Mihaela Iurea et al.
Journal of nanoscience and nanotechnology, 13(6), 3841-3850 (2013-07-19)
New sub-micronic capsules based on a copolymer of maleic anhydride-alt-vinyl acetate and a natural polymer (gelatin) using an interfacial condensation method were obtained. Sub-micronic capsules were characterized by Fourier Transform infrared spectroscopy (FTIR), dynamic light scattering (DLS) method, zeta-potential, scanning...
Hercules V Ferreira et al.
Molecules (Basel, Switzerland), 17(8), 8955-8967 (2012-07-28)
The lipase B from Candida antarctica (Novozym 435®, CALB) efficiently catalyzed the kinetic resolution of some aliphatic secondary alcohols: (±)-4-methylpentan-2-ol, (±)-5-methylhexan-2-ol, (±)-octan-2-ol, (±)-heptan-3-ol and (±)-oct-1-en-3-ol. The lipase showed excellent enantioselectivities in the transesterifications of racemic aliphatic secondary alcohols producing the...
K Wlodarski et al.
European journal of pharmaceutics and biopharmaceutics : official journal of Arbeitsgemeinschaft fur Pharmazeutische Verfahrenstechnik e.V, 96, 237-246 (2015-08-08)
The aim of this paper was to evaluate physical stability of solid dispersions in respect to the drug, tadalafil (Td), in vinylpyrrolidone and vinyl acetate block copolymer (PVP-VA). Nine solid dispersions of Td in PVP-VA (Td/PVP-VA) varied in terms of...
D N Nguyen et al.
International journal of pharmaceutics, 475(1-2), 214-226 (2014-09-03)
This study was the first investigation into the potential of a fixed dose combination of ritonavir and darunavir in the form of dispersible powders prepared by spray drying. A common polymer (hydroxypropyl methylcellulose, polyvinylpyrrolidone, and polyvinylpyrrolidone-vinyl acetate 64) was formulated...
Felipe Tucca et al.
Marine pollution bulletin, 88(1-2), 174-179 (2014-10-06)
Current monitoring programs are focused on hydrophobic chemicals detection in aquatic systems, which require the collection of high volumes of water samples at a given time. The present study documents the preliminary use of the polymer ethylene vinyl acetate (EVA)...
Ellen Holthoff et al.
Sensors (Basel, Switzerland), 10(3), 1986-2002 (2010-01-01)
We report on the development of a microelectromechanical systems (MEMS)-scale photoacoustic sensor for the detection of trace gases. A mid-infrared quantum cascade laser (QCL) was used to determine detection limits for acetic acid, acetone, 1,4-dioxane, and vinyl acetate. The source...
Oveimar Barbosa et al.
New biotechnology, 27(6), 844-850 (2010-07-30)
Enzyme preparations of Candida antarctica B lipase (CAL-B) - immobilized on Eupergit C and partially modified Eupergit C supports - were tested for kinetic resolution of (R/S)-propranolol, using vinyl acetate as acyl donor, and toluene as organic solvent. The effects...
Janine Jansen et al.
Journal of controlled release : official journal of the Controlled Release Society, 147(1), 54-61 (2010-07-21)
Photo-crosslinkable, fumaric acid monoethyl ester-functionalized poly(trimethylene carbonate) oligomers were synthesized and copolymerized with N-vinyl pyrrolidone (NVP) and vinyl acetate (VAc) to form biodegradable polymer networks. The copolymerization reactions were much faster than homopolymerization of the fumarate end-groups of the macromers....
Jing-Yun Wang et al.
Enzyme and microbial technology, 51(1), 40-46 (2012-05-15)
Lipase from Burkholderia cepacia was encapsulated inside zirconia particles by biomimetic mineralization of K₂ZrF₆ induced with protamine, a natural cationic protein. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR) were employed for the characterization...
M S Bogdanffy et al.
Inhalation toxicology, 13(5), 377-396 (2001-04-11)
Vinyl acetate is used in the manufacture of many polymers. The Clean Air Act Amendments of 1990 require that an inhalation risk assessment be conducted to assess risks to human health from ambient exposures. Vinyl acetate is a nasal carcinogen...
Anca Ursoiu et al.
Molecules (Basel, Switzerland), 17(11), 13045-13061 (2012-11-06)
Sol-gel entrapment is an efficient immobilization technique that allows preparation of robust and highly stable biocatalysts. Lipase from Candida antarctica B was immobilized by sol-gel entrapment and by sol-gel entrapment combined with adsorption on Celite 545, using a ternary silane...
I Lara-Mayorga et al.
Environmental technology, 31(1), 1-6 (2010-03-18)
In a previous paper, the authors showed that a slight aeration of a methanogenic reactor treating wastewater from the manufacture of polymeric resins could improve its performance, by increasing or allowing the removal of some of its contaminants, including vinyl...
Francesca Reineri et al.
Nature communications, 6, 5858-5858 (2015-01-06)
The advent of nuclear spins hyperpolarization techniques represents a breakthrough in the field of medical diagnoses by magnetic resonance imaging. Dynamic nuclear polarization (DNP) is the most widely used method, and hyperpolarized metabolites such as [1-(13)C]-pyruvate are shown to report...
Determination of plastic monomers in water by solid-phase microextraction coupled with liquid chromatography
Batlle R, et al.
Journal of AOAC (Association of Official Analytical Chemists) International, 84(2), 431-436 (2001)
Matthew S Bogdanffy et al.
Toxicology letters, 140-141, 83-98 (2003-04-05)
Understanding the mode of action of carcinogens is critical to scientifically assessing exposure-related risk. Regulatory hazard classification schemes and dose-response assessment paradigms generally require basic knowledge of genotoxic potential to guide decisions on which scheme or paradigm is most appropriate....
Íris Duarte et al.
Pharmaceutical research, 32(1), 222-237 (2014-08-20)
To present a new screening methodology intended to be used in the early development of spray-dried amorphous solid dispersions. A model that combines thermodynamic, kinetic and manufacturing considerations was implemented to obtain estimates of the miscibility and phase behavior of...
Zhengyong Zhang et al.
Journal of hazardous materials, 176(1-3), 1113-1117 (2010-01-12)
The spent catalyst from vinyl acetate synthesis contains large quantity of zinc. The present study attempts to leach zinc using a mixture of ammonia, ammonium carbonate and water solution, after microwave treatment. The effect of important parameters such as leaching...
Conor Donnelly et al.
Pharmaceutical research, 32(1), 167-179 (2014-07-31)
Amorphous drug-polymer solid dispersions have been found to result in improved drug dissolution rates when compared to their crystalline counterparts. However, when the drug exists in the amorphous form it will possess a higher Gibb's free energy than its associated...
Mutagenicity studies on styrene and vinyl acetate.
H Norppa et al.
Annals of the New York Academy of Sciences, 534, 671-678 (1988-01-01)
A L Kelly et al.
International journal of pharmaceutics, 496(1), 117-123 (2015-07-19)
A transflectance near infra red (NIR) spectroscopy approach has been used to simultaneously measure drug and plasticiser content of polymer melts with varying opacity during hot melt extrusion. A high temperature reflectance NIR probe was mounted in the extruder die...

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