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https://www.readbyqxmd.com/read/28231499/surfactant-cobalt-iii-complexes-the-impact-of-hydrophobicity-on-interaction-with-hsa-and-dna-insights-from-experimental-and-theoretical-approach
#1
Selvakumar Veeralakshmi, Gopal Sabapathi, Selvan Nehru, Ponnambalam Venuvanalingam, Sankaralingam Arunachalam
To develop surfactant-based metallodrugs, it is very important to know about their hydrophobicity, micelle forming capacity, their interaction with biomacromolecules such as proteins and nucleic acids, and biological activities. Here, diethylenetriamine (dien) and tetradecylamine ligand (TA) based surfactant-cobalt(III) complexes with single chain domain, [Co(dien)(TA)Cl2]ClO4 (1) and double chain domain [Co(dien)(TA)2Cl](ClO4)2 (2) were chosen to study the effect of hydrophobicity on the interaction with human serum albumin and calf thymus DNA...
February 16, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28230971/multifaceted-gold-palladium-bimetallic-nanorods-and-their-geometric-compositional-and-catalytic-tunabilities
#2
Lichao Sun, Qingfeng Zhang, Guangfang Grace Li, Esteban Villarreal, Xiaoqi Fu, Hui Wang
Kinetically controlled, seed-mediated coreduction provides a robust and versatile synthetic approach to multimetallic nanoparticles with precisely controlled geometries and compositions. Here we demonstrate that single-crystalline cylindrical Au nanorods selectively transform into a series of structurally distinct Au@Au-Pd alloy core-shell bimetallic nanorods with exotic multifaceted geometries enclosed by specific types of facets upon seed-mediated Au-Pd coreduction under diffusion controlled conditions. By adjusting several key synthetic parameters, such as the Pd/Au precursor ratio, the reducing agent concentration, the capping surfactant concentration, and foreign metal ion additives, we have been able to simultaneously fine-tailor the atomic-level surface structures and fine-tune the compositional stoichiometries of the multifaceted Au-Pd bimetallic nanorods...
February 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28230873/long-stokes-shifts-and-vibronic-couplings-in-perfluorinated-polyanilines
#3
Panagiotis Dallas, Ilija Rašović, Tim Puchtler, Robert A Taylor, Kyriakos Porfyrakis
We report the effect of surfactant addition on the optical properties of perfluorinated polyanilines synthesized through liquid-liquid interfaces. We obtained very long Stokes shifts, 205 nm, for oligomers derived from a hydrofluoroether-water system in the presence of Triton X-100 as a surfactant, and vibronic fine features from a toluene-water system.
February 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28230285/modeling-lung-surfactant-interactions-with-benzo-a-pyrene
#4
Jacek Korchowiec, Anna Stachowicz-Kusnierz, Sonia Trojan, Lukasz Cwiklik, Beata Korchowiec
By reducing surface tension of the air-water interface in alveoli, lung surfactant (LS) is crucial for proper functioning of the lungs. It also forms the first barrier against inhaled pathogens. In this study we inspect the interactions of LS models with a dangerous air pollutant, benzo[a]pyrene (BaP). DPPC, POPC and their 1:1 mixture are used as LS models. Pressure-area isotherms are employed to study macroscopic properties of the monolayers. We find that addition of BaP has a condensing effect, manifested by lowering the values of surface pressure and shifting the isotherms to smaller areas...
February 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28229944/development-and-in-vivo-evaluation-of-an-innovative-hydrochlorothiazide-in-cyclodextrins-in-solid-lipid-nanoparticles-formulation-with-sustained-release-and-enhanced-oral-bioavailability-for-the-hypertension-treatment-in-pediatrics
#5
Marzia Cirri, Natascia Mennini, Francesca Maestrelli, Paola Mura, Carla Ghelardini, Lorenzo di Cesare Mannelli
An innovative pediatric oral formulation of hydrochlorothiazide (HCT) (2mg/mL), endowed with improved bioavailability and sustained release properties and suitable for the hypertension treatment in pediatric patients, was developed by combining the drug-cyclodextrin complexation and the incorporation of the complex into Solid Lipid Nanoparticles (SLN). Precirol(®)ATO5-based SLN, with two different surfactants (Pluronic(®)F68 and Tween(®)80) loaded with the drug as such or as binary system with hydroxypropyl-beta-cyclodextrin (HPβCd) and sulfobutyl-ether-beta-cyclodextrin (SBEβCd) both as physical mixture (P...
February 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28229943/in-situ-hybrid-nano-drug-delivery-system-ihn-dds-of-antiretroviral-drug-for-simultaneous-targeting-to-multiple-viral-reservoirs-an-in-vivo-proof-of-concept
#6
Anil B Jindal, Sagar S Bachhav, Padma V Devarajan
We report In situ hybrid nano drug delivery system (IHN-DDS) of nevirapine (NVP) for simultaneous targeting to multiple viral reservoirs. The IHN-DDS system was comprised of a preconcentrate containing NVP, lipid, and a surfactant which when diluted with water resulted in the formation of nanoparticles of size range varied from 70 to 1100nm. Transmission electron microscopy and small angle neutron scattering studies of pellet and supernatant obtained after centrifugation of the IHN-DDS revealed spherical shaped nanoparticles and assembled structures, respectively...
February 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28229522/fused-silica-capillaries-with-two-segments-of-different-internal-diameters-and-inner-surface-roughnesses-prepared-by-etching-with-supercritical-water-and-used-for-volume-coupling-electrophoresis
#7
Marie Horká, Pavel Karásek, Michal Roth, Karel Šlais
In the present work, single-piece fused silica capillaries with two different internal diameter segments featuring different inner surface roughness were prepared by new etching technology with supercritical water and used for volume coupling electrophoresis. The concept of separation and on-line pre-concentration of analytes in high conductivity matrix is based on the on-line large-volume sample pre-concentration by the combination of transient isotachophoretic stacking and sweeping of charged proteins in micellar electrokinetic chromatography using non-ionogenic surfactant...
February 22, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28228853/diels-alder-reactions-of-myrcene-using-intensified-continuous-flow-reactors
#8
Christian H Hornung, Miguel Á Álvarez-Diéguez, Thomas M Kohl, John Tsanaktsidis
This work describes the Diels-Alder reaction of the naturally occurring substituted butadiene, myrcene, with a range of different naturally occurring and synthetic dienophiles. The synthesis of the Diels-Alder adduct from myrcene and acrylic acid, containing surfactant properties, was scaled-up in a plate-type continuous-flow reactor with a volume of 105 mL to a throughput of 2.79 kg of the final product per day. This continuous-flow approach provides a facile alternative scale-up route to conventional batch processing, and it helps to intensify the synthesis protocol by applying higher reaction temperatures and shorter reaction times...
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28228557/surfactant-protein-a-inhibits-growth-and-adherence-of-uropathogenic-escherichia-coli-to-protect-the-bladder-from-infection
#9
Jiro Hashimoto, Motoko Takahashi, Atsushi Saito, Masaki Murata, Yuichiro Kurimura, Chiaki Nishitani, Rina Takamiya, Yasuaki Uehara, Yoshihiro Hasegawa, Yoshiki Hiyama, Norimasa Sawada, Satoshi Takahashi, Naoya Masumori, Yoshio Kuroki, Shigeru Ariki
Surfactant protein A (SP-A) is a multifunctional host defense collectin that was first identified as a component of pulmonary surfactant. Although SP-A is also expressed in various tissues, including the urinary tract, its innate immune functions in nonpulmonary tissues are poorly understood. In this study, we demonstrated that adherence of uropathogenic Escherichia coli (UPEC) to the bladder was enhanced in SP-A-deficient mice, which suggests that SP-A plays an important role in innate immunity against UPEC...
February 22, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28228526/trimethylamine-n-oxide-stabilizes-proteins-via-a-distinct-mechanism-compared-with-betaine-and-glycine
#10
Yi-Ting Liao, Anthony C Manson, Michael R DeLyser, William G Noid, Paul S Cremer
We report experimental and computational studies investigating the effects of three osmolytes, trimethylamine N-oxide (TMAO), betaine, and glycine, on the hydrophobic collapse of an elastin-like polypeptide (ELP). All three osmolytes stabilize collapsed conformations of the ELP and reduce the lower critical solution temperature (LSCT) linearly with osmolyte concentration. As expected from conventional preferential solvation arguments, betaine and glycine both increase the surface tension at the air-water interface...
February 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28225603/reversible-lifting-of-surface-supported-lipid-bilayers-with-a-membrane-spanning-non-ionic-triblock-copolymer
#11
Steven C Hayden, Ann Junghans, Jaroslaw Majewski, Millicent Anne Firestone
Neutron reflectometry was used to monitor structural variations in surface supported DMPC bilayers induced by the addition of Triton X-100, a surfactant commonly used to aid solubilization of membrane proteins, and the co-addition of a membrane spanning non-ionic amphiphilic triblock copolymer, (PEO117-PPO47-PEO117, Pluronic F98). Surfactant addition causes slight compression of the bilayer thickness and the creation of a distinct EO layer that increases the hydrophilic layer proximal to the supporting substrate (i...
February 22, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28225285/multi-scale-modeling-of-the-effects-of-salt-and-perfume-raw-materials-on-the-rheological-properties-of-commercial-thread-like-micellar-solutions
#12
Xueming Tang, Weizhong Zou, Peter H Koenig, Shawn D McConaughy, Michael R Weaver, David Michael Eike, Michael J Schmidt, Ronald G Larson
We link micellar structures to rheological properties for two surfactant body-wash formulations at various concentrations of salts and perfume raw materials (PRMs) using molecular simulations and micellar-scale modeling as well as traditional surfactant packing arguments. The two body washes, named BW-1EO and BW-3EO, are composed of sodium lauryl ethylene glycol ether sulfate (SLEnS, where n is the average number of ethylene glycol repeat units), cocamidopropyl betaine (CAPB), ACCORD (which is a mixture of six PRMs), and NaCl salt...
February 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28225273/fabric-softener-cellulose-nanocrystal-interaction-a-model-for-assessing-surfactant-deposition-on-cotton
#13
Evdokia K Oikonomou, Fanny Mousseau, Nikolay Christov, Galder Cristobal, Annie Vacher, Marc Airiau, Claudie Bourgaux, Laurent Heux, Jean-François Berret
There is currently a renewed interest for improving household and personal care formulations to provide more environment friendly products. Fabric conditioners used as softeners have to fulfill a number of stability and biodegradability requirements. They should also display significant adsorption on cotton in the conditions of use. The quantification of surfactant adsorption remains however difficult because the fabric woven structure is complex and deposited amounts are generally small. Here we propose a method to evaluate cellulose/surfactant interactions with increased detection sensitivity...
February 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28224674/from-bola-surfactant-templated-bimetal-phosphites-to-the-design-of-crystalline-inorganic-mesoporous-frameworks
#14
Hui-Lin Huang, Wen-Yen Huang, Sue-Lein Wang
Reproducing inorganic modules in situ for pore augmentation of pure inorganic frameworks is challenging but can be a key to rational synthesis. After the first success of using monoamine of varied lengths as template in producing the same set of building blocks that led to a series of growing channels up to 72-membered ring (72R), we have continued to delve into those building blocks to seek any new topologies from them. In this study, we have discovered another type of template that can control the same building blocks to form in situ repeatedly...
February 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28224157/smart-worm-like-micelles-responsive-to-co2-n2-and-light-dual-stimuli
#15
Jianzhong Jiang, Guozheng Wang, Yuxuan Ma, Zhenggang Cui, Bernard P Binks
CO2/N2 and light dual stimuli-responsive worm-like micelles (WLMs) were obtained by addition of a relatively small amount of a switchable surfactant, 4-butyl-4'-(4-N,N-dimethylhexyloxy-amine) azobenzene bicarbonate (AZO-B6-CO2), sensitive to the same triggers to a binary aqueous solution of cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal).
February 22, 2017: Soft Matter
https://www.readbyqxmd.com/read/28223797/fabrication-and-in-vitro-in-vivo-evaluation-of-amorphous-andrographolide-nanosuspensions-stabilized-by-d-%C3%AE-tocopheryl-polyethylene-glycol-1000-succinate-sodium-lauryl-sulfate
#16
Hongzhi Qiao, Lihua Chen, Tianqi Rui, Jingxian Wang, Ting Chen, Tingming Fu, Junsong Li, Liuqing Di
Andrographolide (ADG) is a diterpenoid isolated from Andrographis paniculata with a wide spectrum of biological activities, including anti-inflammatory, anticancer and hepatoprotective effects. However, its poor water solubility and efflux by P-glycoprotein have resulted in lower bioavailability. In this study, ADG nanosuspensions (ADG-NS) were prepared using a wet media milling technique followed by freeze drying. d-α-Tocopheryl polyethylene glycol 1000 succinate (TPGS), a surfactant that inhibits P-glycoprotein function, and sodium lauryl sulfate were used as surface stabilizers...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28223485/on-the-shape-of-giant-soap-bubbles
#17
Caroline Cohen, Baptiste Darbois Texier, Etienne Reyssat, Jacco H Snoeijer, David Quéré, Christophe Clanet
We study the effect of gravity on giant soap bubbles and show that it becomes dominant above the critical size [Formula: see text], where [Formula: see text] is the mean thickness of the soap film and [Formula: see text] is the capillary length ([Formula: see text] stands for vapor-liquid surface tension, and [Formula: see text] stands for the liquid density). We first show experimentally that large soap bubbles do not retain a spherical shape but flatten when increasing their size. A theoretical model is then developed to account for this effect, predicting the shape based on mechanical equilibrium...
February 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28223247/in-situ-determination-of-the-saturation-solubility-of-nanocrystals-of-poorly-soluble-drugs-for-dermal-application
#18
Miriam Colombo, Sven Staufenbiel, Eckart Rühl, Roland Bodmeier
The aim of this study was to determine, in situ, the saturation solubility and dissolution rate of nanocrystals of three poorly water-soluble drugs for dermal application. The nanocrystals were prepared by wet bead milling. Their size could be controlled by various process parameters. The saturation solubility was measured in water or in the presence of surfactant at 32°C with a Sirius(®) inForm based on in situ UV/VIS spectroscopy. The saturation solubility of nanocrystals with sizes of ∼300nm increased for each drug in comparison to non-milled drug powders, with factors of increase in the range 1...
February 18, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28221812/intermicellar-interactions-and-the-viscoelasticity-of-surfactant-solutions-complementary-use-of-sans-and-saxs
#19
Viviane Lutz-Bueno, Marianne Liebi, Joachim Kohlbrecher, Peter Fischer
In ionic surfactant micelles, basic interactions among distinct parts of surfactant monomers, their counterion, and additives are fundamental to tune molecular self-assembly and enhance viscoelasticity. Here, we investigate the addition of sodium salicylate (NaSal) to hexa-decyltrimethyl ammonium chloride and bromide (CTAC and CTAB) and 1-hexa-decyl pyridinium chloride and bromide (CPyCl and CPyBr), which have distinct counterions and headgroup structures, but the same hydrophobic tail. Different contrasts are obtained from small-angle neutron scattering SANS, which probes differences between the nucleus of atoms, and X-rays SAXS, which probes differences in electron density...
February 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28221763/inactivation-clearance-and-functional-effects-of-lung-instilled-short-and-long-silver-nanowires-in-rats
#20
Kian Fan Chung, Joanna Seiffert, Shu Chen, Ioannis G Theodorou, Angela Erin Goode, Bey Fen Leo, Catriona M McGilvery, Farhana Hussain, Coen Wiegman, Christos Rossios, Jie Zhu, Jicheng Gong, Farid Tariq, Vladimir Yufit, Alexander J Monteith, Teruo Hashimoto, Jeremy N Skepper, Mary P Ryan, Junfeng Jim Zhang, Teresa D Tetley, Alexandra E Porter
There is a potential for silver nanowires (AgNWs) to be inhaled but there is little information on their health effects and their chemical transformation inside the lungs in vivo. We studied the effects of short (S-AgNWs; 1.5µm) and long (L-AgNWs; 10 µm) nanowires instilled into the lungs of Sprague-Dawley rats. S- and L-AgNWs were phagocytosed and degraded by macrophages; there was no frustrated phagocytosis. Interestingly, both AgNWs were internalized in alveolar Type II epithelial cells (ATII), with precipitation of Ag2S on their surface as secondary Ag2S nanoparticles...
February 21, 2017: ACS Nano
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