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Maleic acid

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https://www.readbyqxmd.com/read/28098457/surface-forces-and-rheology-of-titanium-dioxide-in-the-presence-of-dicarboxylic-acids-from-molecular-interactions-to-yield-stress
#1
E-Jen Teh, Yee-Kwong Leong, Vincent S J Craig
The surface forces and yield stress of titanium dioxide were measured in the presence of dicarboxylic acids in order to understand the molecular basis for the observed rheological response. The yield stress was measured using the static vane technique whilst the surface forces were characterised using an Atomic Force Microscope. The trans and cis isomers of butenedioic acid (fumaric and maleic acids respectively) were chosen as the relative orientation of the carboxylic groups differs substantially. This enables us to test the hypothesis that an increase in adhesion leads to an increase in yield stress as a consequence of the dicarboxylic acids participating in highly directed bridging...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28097924/enhancing-the-performance-of-electro-peroxone-by-incorporation-of-uv-irradiation-and-bdd-anodes
#2
Nasr Bensalah, Ahmed Bedoui
In this work, the treatment of 4-nitrophenol (NP) in water by ozonation, electrolysis, electro-peroxone (EP), and photo-electro-peroxone (PEP) processes was investigated. PEP process is based on the combination of ozonation, UV irradiation, and electrolysis using carbon felt cathode and Boron Doped Diamond (BDD) anode. In this process, H2O2 is electrochemically generated from reduction of O2 in the ozone generator effluent at a carbon felt cathode. The insitu generated H2O2 is simultaneously decomposed by UV- photolysis and by reaction with O3 to form HO(-) radicals that can rapidly and non-selectively oxidize organic pollutants...
January 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28089451/crystallogenesis-of-membrane-proteins-mediated-by-polymer-bounded-lipid-nanodiscs
#3
Jana Broecker, Bryan T Eger, Oliver P Ernst
For some membrane proteins, detergent-mediated solubilization compromises protein stability and functionality, often impairing biophysical and structural analyses. Hence, membrane-protein structure determination is a continuing bottleneck in the field of protein crystallography. Here, as an alternative to approaches mediated by conventional detergents, we report the crystallogenesis of a recombinantly produced membrane protein that never left a lipid bilayer environment. We used styrene-maleic acid (SMA) copolymers to solubilize lipid-embedded proteins into SMA nanodiscs, purified these discs by affinity and size-exclusion chromatography, and transferred proteins into the lipidic cubic phase (LCP) for in meso crystallization...
January 3, 2017: Structure
https://www.readbyqxmd.com/read/28088118/histidine-functionalized-carbon-based-dot-zinc-ii-nanoparticles-as-a-novel-stabilizer-for-pickering-emulsion-synthesis-of-polystyrene-microspheres
#4
Li Ruiyi, Li Zaijun, Liu Junkang
Carbon-based dots (CDs) are nanoparticles with size-dependent optical and electronic properties that have been widely applied in energy-efficient displays and lighting, photovoltaic devices and biological markers. However, conventional CDs are difficult to be used as ideal stabilizer for Pickering emulsion due to its irrational amphiphilic structure. The study designed and synthesized a new histidine-functionalized carbon dot-Zinc(II) nanoparticles, which is termed as His-CD-Zn. The His-CD was made via one-step hydrothermal treatment of histidine and maleic acid...
January 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28079955/solubilization-of-membrane-proteins-into-functional-lipid-bilayer-nanodiscs-using-a-diisobutylene-maleic-acid-copolymer
#5
Abraham Olusegun Oluwole, Bartholomäus Danielczak, Annette Meister, Jonathan Oyebamiji Babalola, Carolyn Vargas, Sandro Keller
Once removed from their natural environment, membrane proteins depend on membrane-mimetic systems to retain their native structures and functions. To this end, lipid-bilayer nanodiscs that are bounded by scaffold proteins or amphiphilic polymers such as styrene/maleic acid (SMA) copolymers have been introduced as alternatives to detergent micelles and liposomes for in vitro membrane-protein research. Herein, we show that an alternating diisobutylene/maleic acid (DIBMA) copolymer shows equal performance to SMA in solubilizing phospholipids, stabilizes an integral membrane enzyme in functional bilayer nanodiscs, and extracts proteins of various sizes directly from cellular membranes...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28078651/fed-batch-enzymatic-saccharification-of-high-solids-pretreated-lignocellulose-for-obtaining-high-titers-and-high-yields-of-glucose
#6
Young Hoon Jung, Hyun Min Park, Dong Hyun Kim, Jungwoo Yang, Kyoung Heon Kim
To reduce the distillation costs of cellulosic ethanol, it is necessary to produce high sugar titers in the enzymatic saccharification step. To obtain high sugar titers, high biomass loadings of lignocellulose are necessary. In this study, to overcome the low saccharification yields and the low operability of high biomass loadings, a fed-batch saccharification process was developed using an enzyme reactor that was designed and built in-house. After optimizing the cellulase and biomass feeding profiles and the agitation speed, 132...
January 11, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28064122/correlation-between-degradation-pathway-and-toxicity-of-acetaminophen-and-its-by-products-by-using-the-electro-fenton-process-in-aqueous-media
#7
Thi Xuan Huong Le, Thi Van Nguyen, Zoulkifli Amadou Yacouba, Laetitia Zoungrana, Florent Avril, Duy Linh Nguyen, Eddy Petit, Julie Mendret, Valerie Bonniol, Mikhael Bechelany, Stella Lacour, Geoffroy Lesage, Marc Cretin
The evolution of the degradation by-products of an acetaminophen (ACE) solution was monitored by HPLC-UV/MS and IC in parallel with its ecotoxicity (Vibrio fischeri 81.9%, Microtox(®) screening tests) during electro-Fenton (EF) oxidation performed on carbon felt. The aromatic compounds 2-hydroxy-4-(N-acetyl) aminophenol, 1,4-benzoquinone, benzaldehyde and benzoic acid were identified as toxic sub-products during the first stage of the electrochemical treatment, whereas aliphatic short-chain carboxylic acids (oxalic, maleic, oxamic, formic, acetic and fumaric acids) and inorganic ions (ammonium and nitrate) were well identified as non-toxic terminal sub-products...
December 21, 2016: Chemosphere
https://www.readbyqxmd.com/read/28035097/new-1-1-and-2-1-salts-in-the-dl-norvaline-maleic-acid-system-as-an-example-of-assembling-various-crystal-structures-from-similar-supramolecular-building-blocks
#8
Sergey G Arkhipov, Evgeniy A Losev, Elena V Boldyreva
Molecular salts and cocrystals of amino acids have potential applications as molecular materials with nonlinear optical, ferroelectric, piezoelectric, and other various target physical properties. The wide choice of amino acids and coformers makes it possible to design various crystal structures. The amino acid-maleic acid system provides a perfect example of a rich variety of crystal structures with different stoichiometries, symmetries and packing motifs built from the molecular building blocks, which are either exactly the same, or differ merely by protonation or as optical isomers...
January 1, 2017: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/28032692/carbon-nanotubes-a-resin-for-electrochemically-modulated-liquid-chromatography
#9
Markus Brammen, Paula Fraga-García, Sonja Berensmeier
Electrochemically modulated liquid chromatography is a special form of ion exchange chromatography in which the separation process is controlled by applying an electric potential to the stationary phase. This form of chromatography has so far only been applied in research studies. The present study shows that multiwalled carbon nanotubes are an effective resin material for an electrochemically modulated chromatography process. The experiments are carried out in a newly designed column which enables the packing of nanomaterials...
December 29, 2016: Journal of Separation Science
https://www.readbyqxmd.com/read/28029342/synthesis-of-caffeine-maleic-acid-co-crystal-by-ultrasound-assisted-slurry-co-crystallization
#10
Prafulla P Apshingekar, Suyog Aher, Adrian L Kelly, Elaine C Brown, Anant Paradkar
A green approach has been used for co-crystallization of noncongruent co-crystal pair of caffeine/maleic acid using water. Ultrasound is known to affect crystallization; hence, the effect of high power ultrasound on the ternary phase diagram has been investigated in detail using a slurry co-crystallization approach. A systematic investigation was performed to understand how the accelerated conditions during ultrasound-assisted co-crystallization will affect different regions of the ternary phase diagram. Application of ultrasound showed considerable effect on the ternary phase diagram, principally on caffeine/maleic acid 2:1 (disappeared) and 1:1 co-crystal (narrowed) regions...
October 28, 2016: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28008233/folic-acid-conjugated-amphiphilic-alternating-copolymer-as-a-new-active-tumor-targeting-drug-delivery-platform
#11
Xia Li, Myron R Szewczuk, Cecile Malardier-Jugroot
Targeted drug delivery using polymeric nanostructures is an emerging cancer research area, engineered for safer, more efficient, and effective use of chemotherapeutic drugs. A pH-responsive, active targeting delivery system was designed using folic acid functionalized amphiphilic alternating copolymer poly(styrene-alt-maleic anhydride) (FA-DABA-SMA) via a biodegradable linker 2,4-diaminobutyric acid (DABA). The polymeric template is pH responsive, forming amphiphilic nanostructures at pH 7, allowing the encapsulation of hydrophobic drugs on its interior...
2016: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/27994408/comparative-evaluation-of-efficacy-of-ethylenediaminetetraacetic-acid-maleic-acid-and-dimercaptosuccinic-acid-against-the-combination-of-these-with-sodium-hypochlorite-for-removal-of-smear-layer-an-in-vitro-scanning-electron-microscope-study
#12
Rishikesh Meshram, Nikhil Sathawane, Roshan Samuel, Narayan Gunaji Jibhkate, Hitesh Gyanani, Sanjay Patil
CONTEXT: The effect of dimercaptosuccinic acid (DMSA) and maleic acid (MA) when used alone on smear layer has been evaluated with mixed results, but their effect when combined with sodium hypochlorite (NaOCl) has not been studied. AIM: To compare the effectiveness of ethylenediaminetetraacetic acid, MA, and DMSA against the combination of these with NaOCl in the removal of smear layer. SETTINGS AND DESIGN: n = 4pq/L(2) q = 1 - p p = Incident rate L = Allowable error...
October 2016: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/27993864/studies-on-behaviors-of-interactions-between-new-polymer-based-zic-hilic-stationary-phases-and-carboxylic-acids
#13
Ashraf Saad Rasheed, Bashaer Abbas Al-Phalahy, Andreas Seubert
Zwitterionic stationary phases with nearly identical capacities were prepared by graft polymerization of a series of sulfobetaine precursors onto the surface of porous PS/DVB particles. The different spacer lengths are used as an investigative tool for the retention behavior of carboxylic acids; namely malonic, succinic, glutaric and maleic acid. In zwitterionic ion chromatography-hydrophilic interaction liquid chromatography (ZIC-HILIC) separation mode, the retention characteristic of carboxylic acids was examined using sodium acetate/acetonitrile eluents and UV detection...
January 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/27987921/production-of-xylooligosaccharides-by-microwave-induced-organic-acid-catalyzed-hydrolysis-of-different-xylan-type-hemicelluloses-optimization-by-response-surface-methodology
#14
Qixuan Lin, Huiling Li, Junli Ren, Aojie Deng, Weiying Li, Chuanfu Liu, Runcang Sun
A feasible approach to produce xylooligosaccharides (XOS) using organic acids as catalysts by microwave-induced hydrolysis of different hemicelluloses was developed. The effects of different acids (oxalic acid, maleic acid, citric acid and sulfuric acid), acid concentration, reaction temperature and reaction time on the hemicelluloses hydrolysis were investigated. Results demonstrated that organic acid was more beneficial to the XOS production than the conventional sulfuric acid. Higher acid concentration, higher reaction temperature and longer reaction time accelerated the further depolymerization of XOS to form monosaccharide...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27981268/the-effect-of-a-triclosan-copolymer-fluoride-%C3%A2-toothpaste-on-plaque-formation-gingivitis-and-%C3%A2-dentin-hypersensitivity-a-single-blinded-%C3%A2-randomized-clinical-study
#15
Rola Al Habashneh, Rawan Farasin, Yousef Khader
OBJECTIVE: The daily removal of supragingival dental plaque is a key factor in the prevention of gingivitis. The aim of the study was to compare the gingival health benefits of a triclosan/copolymer/fluoride toothpaste (Colgate Total, a fluoride toothpaste containing an antiseptic) to a commercially available toothpaste containing 0.243% sodium fluoride in a silica base (Colgate Herbal, a conventional fluoride toothpaste with herbal extracts). METHOD AND MATERIALS: A total of 50 patients with gingivitis and at least one sensitive tooth were included...
December 15, 2016: Quintessence International
https://www.readbyqxmd.com/read/27966863/mt1-mmp-responsive-doxorubicin-conjugated-poly-lactic-co-glycolic-acid-poly-styrene-alt-maleic-anhydride-core-shell-microparticles-for-intrahepatic-arterial-chemotherapy-of-hepatic-cancer
#16
Enkhzaya Davaa, Junghan Lee, Ratchapol Jenjob, Su-Geun Yang
In this study, we demonstrated that the MT1-MMP-responsive peptide (sequence: GPLPLRSWGLK) and doxorubicin-conjugated poly(lactic-co-glycolic acid/poly(styrene-alt-maleic anhydride) core/shell microparticles (PLGA/pSMA MPs) can be applied for intrahepatic arterial injection for hepatocellular carcinoma (HCC). PLGA/pSMA MPs were prepared with a capillary-focused microfluidic device. The particle size, observed by scanning electron microscopy (SEM), was around 22 ± 3 μm. MT1-MMP-responsive peptide and doxorubicin (DOX) were chemically conjugated with pSMA segments on the shell of MPs to form a PLGA/pSMA-peptide-DOX complex, resulting in high encapsulation efficiency (91...
December 22, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27956132/characterization-of-the-structure-of-lipodisq-nanoparticles-in-the-presence-of-kcne1-by-dynamic-light-scattering-and-transmission-electron-microscopy
#17
Rongfu Zhang, Indra D Sahu, Avnika P Bali, Carole Dabney-Smith, Gary A Lorigan
A recently developed membrane mimetic system called styrene maleic acid lipid particles (SMALPs) or lipodisq nanoparticles has shown to possess significant potential for biophysical studies of membrane proteins. This new nanoparticle system is composed of lipids encircled by SMA copolymers. Previous studies showed that SMA copolymers are capable of extracting membrane proteins directly from their native environments without the assistance of detergents. However, a full structural characterization of this promising membrane mimetic system is still lacking...
December 9, 2016: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/27914330/synergistic-effect-of-p-n-heterojunction-supporting-and-zeolite-nanoparticles-in-enhanced-photocatalytic-activity-of-nio-and-sno2
#18
Hadis Derikvandi, Alireza Nezamzadeh-Ejhieh
Increased photocatalytic activity of NiO and SnO2 was achieved by coupling and supporting of them onto clinoptilolite nanoparticles (NC) via calcination of Ni(II)-Sn(IV) - exchanged NC in photocatalytic degradation of metronidazole (MZ) aqueous solution. XRD, XRF, FTIR, SEM, X-ray mapping, DRS, TEM, BET Cyclic voltammetry and electrochemical impedance spectroscopy techniques (EIS) were used for characterization of samples. Red shift occurred in bang gap energies of the coupled semiconductors with respect to monocomponent one...
March 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27863688/determination-of-the-activity-of-maleimide-functionalized-phospholipids-during-preparation-of-liposomes
#19
Mira Oswald, Simon Geissler, Achim Goepferich
Numerous examples exist in the literature for the use of maleimide-thiol-reactions in the area of functionalized nanoparticles. Although the hydrolysis tendency of maleimides is well-known, qualitative and quantitative information on the stability and reactivity of maleimide groups during preparation and in final formulations are missing. This is surprising, since hydrolysis of maleimides prevents nanoparticle functionalization and results in an increase of negative surface charge due to the hydrolysis product maleic acid...
November 30, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27859480/phospholipid-bilayer-affinities-and-solvation-characteristics-by-electrokinetic-chromatography-with-a-nanodisc-pseudostationary-phase
#20
William M Penny, Harmen B Steele, J B Alexander Ross, Christopher P Palmer
Phospholipid bilayer nanodiscs composed of 1,2-dimyristoyl-sn-glycero-3-phosphocholine and synthetic maleic acid-styrene copolymer belts have been introduced as a pseudostationary phase (PSP) in electrokinetic chromatography and demonstrated good performance. The nanodiscs provide a suitable migration range and high theoretical plate counts. Using this nanodisc pseudostationary phase, the affinity of the bilayer structure for probe solutes was determined and characterized. Good correlation is observed between retention factors and octanol water partition coefficients for particular categories of solutes, but the general correlation is weak primarily because the nanodiscs show stronger affinity than octanol for hydrogen bond donors...
November 14, 2016: Electrophoresis
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