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Synthetic colloid

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https://www.readbyqxmd.com/read/28604713/phagocytosis-inspired-behaviour-in-synthetic-protocell-communities-of-compartmentalized-colloidal-objects
#1
Laura Rodríguez-Arco, Mei Li, Stephen Mann
The spontaneous assembly of micro-compartmentalized colloidal objects capable of controlled interactions offers a step towards rudimentary forms of collective behaviour in communities of artificial cell-like entities (synthetic protocells). Here we report a primitive form of artificial phagocytosis in a binary community of synthetic protocells in which multiple silica colloidosomes are selectively ingested by self-propelled magnetic Pickering emulsion (MPE) droplets comprising particle-free fatty acid-stabilized apertures...
June 12, 2017: Nature Materials
https://www.readbyqxmd.com/read/28581015/colloidal-synthesis-of-silicon-nanoparticles-in-molten-salts
#2
A Shavel, L Guerrini, R A Alvarez-Puebla
Silicon nanoparticles are unique materials with applications in a variety of fields, from electronics to catalysis and biomedical uses. Despite technological advancements in nanofabrication, the development of a simple and inexpensive route for the synthesis of homogeneous silicon nanoparticles remains highly challenging. Herein, we describe a new, simple and inexpensive colloidal synthetic method for the preparation, under normal pressure and mild temperature conditions, of relatively homogeneous spherical silicon nanoparticles of either ca...
June 5, 2017: Nanoscale
https://www.readbyqxmd.com/read/28560698/a-biocompatible-synthetic-lung-fluid-based-on-human-respiratory-tract-lining-fluid-composition
#3
Abhinav Kumar, Wachirun Terakosolphan, Mireille Hassoun, Kalliopi-Kelli Vandera, Astrid Novicky, Richard Harvey, Paul G Royall, Elif Melis Bicer, Jonny Eriksson, Katarina Edwards, Dirk Valkenborg, Inge Nelissen, Dave Hassall, Ian S Mudway, Ben Forbes
PURPOSE: To characterise a biorelevant simulated lung fluid (SLF) based on the composition of human respiratory tract lining fluid. SLF was compared to other media which have been utilized as lung fluid simulants in terms of fluid structure, biocompatibility and performance in inhalation biopharmaceutical assays. METHODS: The structure of SLF was investigated using cryo-transmission electron microscopy, photon correlation spectroscopy and Langmuir isotherms. Biocompatibility with A549 alveolar epithelial cells was determined by MTT assay, morphometric observations and transcriptomic analysis...
May 30, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28558133/loops-cycles-at-surfaces-the-unique-properties-of-topological-polymer-brushes
#4
Edmondo Maria Benetti, Mohammad Divandari, Shivaprakash N Ramakrishna, Giulia Morgese, Wenqing Yan, Lucca Trachsel
Grafting synthetic polymers to inorganic and organic surfaces yielding polymer "brushes" has represented a revolution in many fields of materials science. Polymer brushes provide colloidal stabilization to nanoparticles (NPs), prevent and/or regulate the adsorption of proteins on biomaterials, and significantly reduce friction when applied to two surfaces sheared against each other. Can the performance of polymer brushes as steric stabilizers and boundary lubricants be improved? The answer to this question encompasses the application of polymer grafts presenting different chain topologies, beyond linearity...
May 30, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28551571/the-effect-of-solution-ph-on-the-structural-stability-of-magnetoferritin
#5
L Balejčíková, V M Garamus, M V Avdeev, V I Petrenko, L Almásy, P Kopčanský
The structural stability of magnetoferritin, a synthetic analogue of ferritin, at various pH levels is assessed here. The structural and electrical properties of the complexes were determined by small-angle X-ray scattering (SAXS), dynamic light scattering (DLS) and zeta potential measurements. At pH 3-6 a reduction of electrostatic repulsion on the suspended colloids resulted in aggregation and sedimentation of magnetoferritin. At neutral to slightly alkaline conditions (pH 7-9) the magnetoferritin structure was stable for lower iron loadings...
May 18, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28544803/hollow-mesoporous-carbon-microparticles-and-micromotors-with-single-holes-templated-by-colloidal-silica-assisted-gas-bubbles
#6
Xiaoxi Huang, Tao Zhang, Tewodros Asefa
A simple, new synthetic method that produces hollow, mesoporous carbon microparticles, each with a single hole on its surface, is reported. The synthesis involves unique templates, which are composed of gaseous bubbles and colloidal silica, and poly(furfuryl alcohol) as a carbon precursor. The conditions that give these morphologically unique carbon microparticles are investigated, and the mechanisms that result in their unique structures are proposed. Notably, the amount of colloidal silica and the type of polymer are found to hugely dictate whether or not the synthesis results in hollow asymmetrical microparticles, each with a single hole...
May 19, 2017: Small
https://www.readbyqxmd.com/read/28544250/prevalence-of-and-risk-factors-for-intraoperative-gastroesophageal-reflux-and-postanesthetic-vomiting-and-diarrhea-in-dogs-undergoing-general-anesthesia
#7
Carlos Torrente, Isabel Vigueras, Edgar G Manzanilla, Cecilia Villaverde, Laura Fresno, Bibiana Carvajal, Marina Fiñana, Cristina Costa-Farré
OBJECTIVE: To determine the prevalence of intraoperative gastroesophageal reflux (GER) and postanesthetic vomiting and diarrhea, and to evaluate risk factors associated with these gastrointestinal disorders (GID) in dogs undergoing general anesthesia. DESIGN: Prospective observational study. SETTING: University teaching hospital. ANIMALS: Two hundred thirty-seven client-owned dogs undergoing general inhalant anesthesia for diagnostic or surgical purposes...
May 23, 2017: Journal of Veterinary Emergency and Critical Care
https://www.readbyqxmd.com/read/28535789/a-multi-target-therapeutic-potential-of-prunus-domestica-gum-stabilized-nanoparticles-exhibited-prospective-anticancer-antibacterial-urease-inhibition-anti-inflammatory-and-analgesic-properties
#8
Nazar Ul Islam, Raza Amin, Muhammad Shahid, Muhammad Amin, Sumera Zaib, Jamshed Iqbal
BACKGROUND: Phytotherapeutics exhibit diverse pharmacological effects that are based on the combined action of a mixture of phytoconstituents. In this study, Prunus domestica gum-loaded, stabilized gold and silver nanoparticles (Au/Ag-NPs) were evaluated for their prospective anticancer, antibacterial, urease-inhibition, anti-inflammatory, and analgesic properties. METHODS: Au/Ag-NPs were biosynthesized and characterized with UV-Vis, FTIR, SEM, EDX, and XRD techniques...
May 23, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28534401/physical-and-oxidative-stability-of-flaxseed-oil-in-water-emulsions-fabricated-from-sunflower-lecithins-impact-of-blending-lecithins-with-different-phospholipid-profiles
#9
Li Liang, Fang Chen, Xingguo Wang, Qingzhe Jin, Eric Andrew Decker, David Julian McClements
There is great interest in the formulation of plant-based foods enriched with nutrients that promote health, such as polyunsaturated fatty acids. This study evaluated the impact of sunflower phospholipid type on the formation and stability of flaxseed oil-in-water emulsions. Two sunflower lecithins (Sunlipon 50 and 90) with different phosphatidylcholine (PC) levels (59 and 90%, respectively) were used in varying ratios to form emulsions. Emulsion droplet size, charge, appearance, microstructure, and oxidation were measured during storage at 55 °C in the dark...
June 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28527520/recent-advances-in-smart-biotechnology-hydrogels-and-nanocarriers-for-tailored-bioactive-molecules-depot
#10
REVIEW
Gesmi Milcovich, Stefania Lettieri, Filipe E Antunes, Bruno Medronho, Ana C Fonseca, Jorge F J Coelho, Paolo Marizza, Francesca Perrone, Rossella Farra, Barbara Dapas, Gabriele Grassi, Mario Grassi, Silvia Giordani
Over the past ten years, the global biopharmaceutical market has remarkably grown, with ten over the top twenty worldwide high performance medical treatment sales being biologics. Thus, biotech R&D (research and development) sector is becoming a key leading branch, with expanding revenues. Biotechnology offers considerable advantages compared to traditional therapeutic approaches, such as reducing side effects, specific treatments, higher patient compliance and therefore more effective treatments leading to lower healthcare costs...
May 9, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28525710/mercury-telluride-quantum-dot-based-phototransistor-enabling-high-sensitivity-room-temperature-photodetection-at-2000-nm
#11
Mengyu Chen, Haipeng Lu, Nema M Abdelazim, Ye Zhu, Zhen Wang, Wei Ren, Stephen V Kershaw, Andrey L Rogach, Ni Zhao
Near-to-mid-infrared photodetection technologies could be widely deployed to advance the infrastructures of surveillance, environmental monitoring, and manufacturing, if the detection devices are low-cost, in compact format, and with high performance. For such application requirements, colloidal quantum dot (QD) based photodetectors stand out as particularly promising due to the solution processability and ease of integration with silicon technologies; unfortunately, the detectivity of the QD photodetectors toward longer wavelengths has so far been low...
June 5, 2017: ACS Nano
https://www.readbyqxmd.com/read/28520407/controlling-configurational-isomerism-in-three-component-colloidal-hybrid-nanoparticles
#12
James M Hodges, Raymond E Schaak
Colloidal hybrid nanoparticles are solution-dispersible constructs that join together multiple distinct nanoscale materials through direct solid-solid interfaces. Given their multifunctionality and synergistic properties that emerge from interfacial coupling, hybrid nanoparticles are of interest for applications in biomedical imaging, solar energy conversion, heterogeneous catalysis, nanophotonics, and beyond. High-order hybrid nanoparticles, which incorporate three or more nanocrystal domains, offer greater tunability and functional diversity relative to one or two-component nanoparticles...
May 18, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28516400/sytematic-investigation-of-the-role-of-surfactant-composition-and-choice-of-oil-design-of-a-nanoemulsion-based-adjuvant-inducing-concomitant-humoral-and-cd4-t-cell-responses
#13
Signe Tandrup Schmidt, Malene Aaby Neustrup, Stine Harloff-Helleberg, Karen Smith Korsholm, Thomas Rades, Peter Andersen, Dennis Christensen, Camilla Foged
PURPOSE: Induction of cell-mediated immune (CMI) responses is crucial for vaccine-mediated protection against difficult vaccine targets, e.g., Chlamydia trachomatis (Ct). Adjuvants are included in subunit vaccines to potentiate immune responses, but many marketed adjuvants stimulate predominantly humoral immune responses. Therefore, there is an unmet medical need for new adjuvants, which potentiate humoral and CMI responses. The purpose was to design an oil-in-water nanoemulsion adjuvant containing a synthetic CMI-inducing mycobacterial monomycoloyl glycerol (MMG) analogue to concomitantly induce humoral and CMI responses...
May 17, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28513636/modular-synthesis-of-self-assembling-janus-dendrimers-and-facile-preparation-of-drug-loaded-dendrimersomes
#14
Sami Nummelin, Markus Selin, Sacha Legrand, Jarmo Ropponen, Jani Seitsonen, Antti Nykänen, Jari Koivisto, Jouni Hirvonen, Mauri A Kostiainen, Luis M Bimbo
Materials and methods aimed at the next generation of nanoscale carriers for drugs and other therapeutics are currently in great demand. Yet, creating these precise molecular arrangements in a feasible and straightforward manner represents a remarkable challenge. Herein we report a modular synthetic route for amphiphilic Janus-dendrimers via a copper-catalyzed click reaction (CuAAC) and a facile procedure, using simple injection, to obtain highly uniform dendrimersomes with efficient loading of the model drug compound propranolol...
June 1, 2017: Nanoscale
https://www.readbyqxmd.com/read/28508649/colloidal-synthesis-of-te-doped-bi-nanoparticles-low-temperature-charge-transport-and-thermoelectric-properties
#15
Da Hwi Gu, Seungki Jo, Hyewon Jeong, Hyeong Woo Ban, Sung Hoon Park, Seung Hwae Heo, Fredrick Kim, Jeong In Jang, Ji Eun Lee, Jae Sung Son
Electronically doped nanoparticles formed by incorporation of impurities have been of great interest because of their controllable electrical properties. However, the development of a strategy for n-type or p-type doping on sub-10 nm-sized nanoparticles under the quantum confinement regime is very challenging using conventional processes, owing to the difficulty in synthesis. Herein, we report the colloidal chemical synthesis of sub-10 nm-sized tellurium (Te)-doped Bismuth (Bi) nanoparticles with precisely controlled Te content from 0 to 5% and systematically investigate their low-temperature charge transport and thermoelectric properties...
June 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28500653/blood-transfusion-in-the-surgical-treatment-of-adolescent-idiopathic-scoliosis-a-single-center-experience-of-patient-blood-management-in-210-cases
#16
Søren Ohrt-Nissen, Naeem Bukhari, Casper Dragsted, Martin Gehrchen, Pär I Johansson, Jesper Dirks, Jakob Stensballe, Benny Dahl
BACKGROUND: The surgical treatment of adolescent idiopathic scoliosis can be associated with substantial blood loss, requiring allogeneic red blood cell (RBC) transfusion. This study describes the use of RBC and the effect of a standardized perioperative patient blood management program. STUDY DESIGN AND METHODS: Patients treated with posterior instrumented fusion were consecutively enrolled over a 6-year period. Patient blood management strategies were implemented in 2011, including prophylactic tranexamic acid, intraoperative permissive hypotension, restrictive fluid therapy (including avoidance of synthetic colloids), restrictive RBC trigger according to institutional standardized protocol, the use of cell savage, and goal-directed therapy according to thrombelastography...
May 12, 2017: Transfusion
https://www.readbyqxmd.com/read/28497975/adjuvants-based-on-synthetic-mycobacterial-cord-factor-analogues-biophysical-properties-of-neat-glycolipids-and-nano-self-assemblies-with-dda
#17
Rie S Kallerup, Henrik Franzyk, Mikkel L Schiøth, Sarah Justesen, Birte Martin-Bertelsen, Fabrice Rose, Cecilie M Madsen, Dennis Christensen, Karen S Korsholm, Anan Yaghmur, Camilla Foged
Synthetic mycobacterial cord factor analogues, e.g., trehalose 6,6'-dibehenate (TDB), are highly promising adjuvants due to their strong immunopotentiating capabilities, but their biophysical properties have remained poorly characterized. Here, we report the synthesis of an array of synthetic TDB analogues varying in acyl chain length, degree of acylation and headgroup display, which was subjected to biophysical characterization of neat non-dispersed self-assembled nanostructures in excess buffer and as aqueous dispersions with cationic dimethyldioctadecylammonium (DDA) bromide...
May 12, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28485967/quantifying-angular-correlations-between-the-atomic-lattice-and-the-superlattice-of-nanocrystals-assembled-with-directional-linking
#18
Ivan A Zaluzhnyy, Ruslan P Kurta, Alexander André, Oleg Y Gorobtsov, Max Rose, Petr Skopintsev, Ilya Besedin, Alexey V Zozulya, Michael Sprung, Frank Schreiber, Ivan A Vartanyants, Marcus Scheele
We show that the combination of X-ray scattering with a nanofocused beam and X-ray cross correlation analysis is an efficient way for the full structural characterization of mesocrystalline nanoparticle assemblies with a single experiment. We analyze several hundred diffraction patterns at individual sample locations, that is, individual grains, to obtain a meaningful statistical distribution of the superlattice and atomic lattice ordering. Simultaneous small- and wide-angle X-ray scattering of the same sample location allows us to determine the structure and orientation of the superlattice as well as the angular correlation of the first two Bragg peaks of the atomic lattices, their orientation with respect to the superlattice, and the average orientational misfit due to local structural disorder...
June 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28481516/chemical-synthesis-doping-and-transformation-of-magic-sized-semiconductor-alloy-nanoclusters
#19
Jiwoong Yang, Franziska Muckel, Woonhyuk Baek, Rachel Fainblat, Hogeun Chang, Gerd Bacher, Taeghwan Hyeon
Nanoclusters are important prenucleation intermediates for colloidal nanocrystal synthesis. In addition, they exhibit many intriguing properties originating from their extremely small size lying between molecules and typical nanocrystals. However, synthetic control of multicomponent semiconductor nanoclusters remains a daunting goal. Here, we report on the synthesis, doping, and transformation of multielement magic-sized clusters, generating the smallest semiconductor alloys. We use Lewis acid-base reactions at room temperature to synthesize alloy clusters containing three or four types of atoms...
May 8, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28476616/preparation-of-liposomes-containing-small-gold-nanoparticles-using-electrostatic-interactions
#20
Gennaro A Dichello, Takahiro Fukuda, Toru Maekawa, Raymond L D Whitby, Sergey V Mikhalovsky, Mohammed Alavijeh, Ananth S Pannala, Dipak K Sarker
The development of liposome-nanoparticle colloid systems offers a versatile approach towards the manufacture of multifunctional therapeutic platforms. A strategy to encapsulate small metallic nanoparticles (<4nm) within multilamellar vesicles, effected by exploiting electrostatic interactions was investigated. Two liposome-gold nanoparticle (lipo-GNP) systems were prepared by the reverse-phase evaporation method employing cationic or anionic surface functionalised particles in combination with oppositely charged lipid compositions with subsequent post-formulation PEGylation...
May 3, 2017: European Journal of Pharmaceutical Sciences
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