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A R Fernandes, J Dias-Ferreira, C Cabral, M L Garcia, E B Souto
The clinical use of poorly water-soluble drugs has become a big challenge in pharmaceutical development due to the compromised bioavailability of the drugs in vivo. Nanocrystals have been proposed as a formulation strategy to improve the dissolution properties of these drugs. The benefits of using nanocrystals in drug delivery, when compared to other nanoparticles, are related to their production facilities, simple structure, and suitability for a variety of administration routes. High pressure homogenization (HPH) is the most promising production process, which can be employed at low or high temperatures...
March 5, 2018: Colloids and Surfaces. B, Biointerfaces
Dries J G Devlaminck, Md Mahbubor Rahman, Mamoni Dash, Sangram Keshari Samal, Jan Watté, Sandra Van Vlierberghe, Peter Dubruel
HYPOTHESIS: The complete removal of remaining polymer debris after stripping of optical fiber cables is essential for high precision connection between two fibers. It can be anticipated that electrospun porous membranes as cleaning wipes are able to trap and retain polymer debris within their pores. Impregnation of an oil-in-water emulsion as cleaning agent lowers the interfacial tension between debris and the optical fiber thereby enabling the straightforward removal of polymer debris from the optical fiber...
February 13, 2018: Journal of Colloid and Interface Science
Aernoud A van Batenburg, Karin M Kazemier, Ton Peeters, Matthijs F M van Oosterhout, Joanne J van der Vis, Jan C Grutters, Roel Goldschmeding, Coline H M van Moorsel
Telomeres are small repetitive DNA sequences at the ends of chromosomes which act as a buffer in age-dependent DNA shortening. Insufficient telomere repeats will be recognized as double-strand breaks. Presently, it is becoming more evident that telomere attrition, whether or not caused by mutations in telomere maintenance genes, plays an important role in many inflammatory and age-associated diseases. In this report, a method to (semi)quantitatively assess telomere length and DNA double-strand breaks in formalin-fixed paraffin-embedded (FFPE) tissue is described...
March 1, 2018: Journal of Histochemistry and Cytochemistry: Official Journal of the Histochemistry Society
Jingran Chen, Xingyu Yang, Chenyu Zhu, Xin Xie, Cuiping Lin, Yalei Zhao, Qishe Yan
Antibiotic ciprofloxacin is one of the commonly used broad spectrum fluoroquinolone human and veterinary drugs. Because of the overuse of human beings, the presence of ciprofloxacin has been detected in a variety of environmental matrices. To solve this problem, a facile, environmentally-friendly Ag3 PO4 /AgBr composite photocatalyst was synthesized by a simple precipitation method at room temperature in the presence of cetyltrimethyl ammonium bromide (CTAB). CTAB was served as surfactant and the source of bromide ions...
March 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
J H Hu, H Mi, N Wang, H Y Zhu, W Y Guo, S R Zhang, F Shi, Z B Lei, Z-H Liu, R B Jiang
The catalytic activity of metal nanocrystals is mainly tuned through the control of their shapes and sizes. However, the shapes and sizes of many metal nanocrystals are difficult to control and therefore their catalytic activity is hard to tune. Here, we demonstrate another approach, using differently charged surfactants, for tuning the catalytic activity of metal nanocrystals. Au and Pd nanocrystals capped with cationic cetyltrimethylammonium bromide (CTAB) and anionic citrate are chosen to study the effect of surfactant charges on the catalytic activity...
March 12, 2018: Nanoscale
Dipendra Gyawali, Jimin P Kim, Jian Yang
A novel photo-crosslinkable nanogel is prepared from a biodegradable polymer template with intrinsic photoluminescence and high photostability. The fluorescent nanogels display excellent biodegradability and cytocompatibility owed to the facile synthesis scheme involving a solvent-and surfactant-free one-pot reaction, derived entirely from biocompatible monomers citric acid, maleic acid, L-cysteine, and poly(ethylene glycol). The resultant nanogels are less than 200 nm in diameter with a narrow size distribution and monodispersity, and demonstrate long-term structural stability in biological buffer for two weeks...
March 2018: Bioactive Materials
Fuat Topuz, Tamer Uyar
Mesoporous silica nanoparticles (MSNs) have sparked considerable interest in drug/gene delivery, catalysis, adsorption, separation, sensing, antireflection coatings and bioimaging because of their tunable structural properties. The shape, size and pore structure of MSNs are greatly influenced by the type of additives used, e.g., solvent and pore-templating agent. Here, we studied the influence of cyclodextrin (CD) molecules on the formation of MSNs. The nanoparticles over 100 nm in diameter were synthesized by surfactant-templated, hydrolysis-polycondensation reactions in the presence of pristine CD (β-CD) or hydroxypropyl-functionalized CDs (HP-γ-CD and HP-β-CD)...
2018: Beilstein Journal of Nanotechnology
Furqan Almyahi, Thomas R Andersen, Nathan A Cooling, Natalie P Holmes, Matthew J Griffith, Krishna Feron, Xiaojing Zhou, Warwick J Belcher, Paul C Dastoor
In this study we have optimised the preparation conditions for large-volume nanoparticle inks, based on poly(3-hexylthiophene) (P3HT):indene-C60 multiadducts (ICxA), through two purification processes: centrifugal and crossflow ultrafiltration. The impact of purification is twofold: firstly, removal of excess sodium dodecyl sulfate (SDS) surfactant from the ink and, secondly, concentration of the photoactive components in the ink. The removal of SDS was studied in detail both by a UV-vis spectroscopy-based method and by surface tension measurements of the nanoparticle ink filtrate; revealing that centrifugal ultrafiltration removed SDS at a higher rate than crossflow ultrafiltration even though a similar filter was applied in both cases (10,000 Da M w cut-off)...
2018: Beilstein Journal of Nanotechnology
Yaroslav I Derikov, Georgiy A Shandryuk, Raisa V Talroze, Alexander A Ezhov, Yaroslav V Kudryavtsev
A fast route to transfer Au nanoparticles from aqueous to organic media is proposed based on the use of a high molecular mass diblock copolymer of styrene and 2-vinylpyridine for ligand exchange at the nanoparticle surface. The method enables the preparation of stable sols of Au nanorods with sizes of up to tens of nanometers or Au nanospheres in various organic solvents. By comparing the optical absorbance spectra of Au hydro- and organosols with the data of numerical simulations of the surface plasmon resonance, we find that nanoparticles do not aggregate and confirm the transmission electron microscopy data regarding their shape and size...
2018: Beilstein Journal of Nanotechnology
Melanie Christine Föll, Matthias Fahrner, Victor Oginga Oria, Markus Kühs, Martin Lothar Biniossek, Martin Werner, Peter Bronsert, Oliver Schilling
Background: Proteomic analyses of clinical specimens often rely on human tissues preserved through formalin-fixation and paraffin embedding (FFPE). Minimal sample consumption is the key to preserve the integrity of pathological archives but also to deal with minimal invasive core biopsies. This has been achieved by using the acid-labile surfactant RapiGest in combination with a direct trypsinization (DTR) strategy. A critical comparison of the DTR protocol with the most commonly used filter aided sample preparation (FASP) protocol is lacking...
2018: Clinical Proteomics
Lucía Martínez-Jothar, Sofia Doulkeridou, Raymond M Schiffelers, Javier Sastre Torano, Sabrina Oliveira, Cornelus F van Nostrum, Wim E Hennink
Maleimide-thiol chemistry is widely used for the design and preparation of ligand-decorated drug delivery systems such as poly(lactide-co-glycolide) (PLGA) based nanoparticles (NPs). While many publications on nanocarriers functionalized exploiting this strategy are available in the literature, the conditions at which this reaction takes place vary among publications. This paper presents a comprehensive study on the conjugation of the peptide cRGDfK and the nanobody 11A4 (both containing a free thiol group) to maleimide functionalized PLGA NPs by means of the maleimide-thiol click reaction...
March 8, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
Vijayaraghavan Rangachari, Dexter N Dean, Pratip Rana, Ashwin Vaidya, Preetam Ghosh
Self-templating propagation of protein aggregate conformations is increasingly becoming a significant factor in many neurological diseases. In Alzheimer disease (AD), intrinsically disordered amyloid-β (Aβ) peptides undergo aggregation that is sensitive to environmental conditions. High-molecular weight aggregates of Aβ that form insoluble fibrils are deposited as senile plaques in AD brains. However, low-molecular weight aggregates called soluble oligomers are known to be the primary toxic agents responsible for neuronal dysfunction...
March 8, 2018: Biochimica et Biophysica Acta
Maryam Kashanian, Nooshin Eshraghi, Narges Sheikhansari, Arash Bordbar, Elahehsadat Khatami
The purpose of the present study was to compare the effect of a two-dose administration of betamethasone with 12 hours interval vs. 24 hours interval on neonatal respiratory distress syndrome (RDS). The study was performed as a randomised clinical trial on 201 pregnant women with a gestational age of 26-34 weeks. In one group 12 mg of betamethasone every 12 hours for two doses and in the other group 12 mg of betamethasone every 24 hours for two doses were prescribed intramuscularly. There were no significant differences between the two groups according to maternal age, parity, gravidity, BMI, neonatal sex, need to surfactant, NICU admission, NICU stay, neonatal death, neonatal sepsis and Apgar score at minutes 1 and 5, but the gestational age at the beginning of the study and delivery receiving complete course of betamethasone and neonatal weight were lower in 24 hours group...
March 12, 2018: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
Ruiwei Xu, Zhen Zhang, Liping Wang, Ningning Yin, Xiaohui Zhan
This study evaluated the effects of two surfactants (i.e., Tween 80 and SDS) on biodegradation of crude oil by mixed bacterial consortium in soil-aqueous system. The mixed bacterial consortium was domesticated from the activated sludge of cooking plant through a progressive domestication process. High-throughput sequencing analysis revealed that Rhodanobacter sp. was the dominant bacteria. The higher CMCeff value for two surfactants was observed in soil-aqueous system compared with that in aqueous system, which was likely due to their adsorption onto soil particles...
March 10, 2018: Environmental Science and Pollution Research International
Mohsen Saeedi, Loretta Y Li, John R Grace
The effects of soil components such as clay minerals and as humic acids, as well as co-existing metals and polycyclic aromatic hydrocarbons, on desorption and mobility are examined. Three types of artificially blended clay and clay mineral mixtures (pure kaolinite, kaolinite + sand and kaolinite + sand + bentonite), each with different humic acid content, were tested for desorption and mobility of acenaphthene, fluorene and fluoranthene by three extracting solutions CaCl2 (0.01 M) and EDTA (0.01M) with non-ionic surfactants (Tween 80 and Triton X100)...
March 8, 2018: Journal of Environmental Management
Catarina Leal Seabra, Cláudia Nunes, Manuela Brás, Maria Gomez-Lazaro, Celso A Reis, Inês C Gonçalves, Salette Reis, M Cristina L Martins
Helicobacter pylori infection is one of the major risk factors for gastric cancer development. Available antibiotic-based treatments not only fail in around 20% of patients but also have a severe negative impact on the gut microbiota. Recently, we demonstrated that nanostructured lipid carriers (NLC), even without any drug loaded, are bactericidal against H. pylori at low concentrations. This work aims to clarify NLC mode of action and to evaluate if their bactericidal effect is specific to H. pylori without affecting bacteria from microbiota...
March 7, 2018: European Journal of Pharmaceutics and Biopharmaceutics
Peter D Sottile, David Albers, Marc M Moss
BACKGROUND: Neuromuscular blockade (NMB) is a therapy for acute respiratory distress syndrome (ARDS). However, the mechanism by which NMB may improve outcome for ARDS patients remains unclear. We sought to determine whether NMB attenuates biomarkers of epithelial and endothelial lung injury and systemic inflammation in ARDS patients, and whether the association is dependent on tidal volume size and the initial degree of hypoxemia. METHODS: We performed a secondary analysis of patients enrolled in the ARDS network low tidal volume ventilation (ARMA) study...
March 10, 2018: Critical Care: the Official Journal of the Critical Care Forum
Qingqing Wang, Fangxu Yang, Yu Zhang, Mingxi Chen, Xiaotao Zhang, Shengbin Lei, Rongjin Li, Wenping Hu
Two-dimensional molecular crystals (2DMCs) are promising candidate for flexible and large-area electronics. Their large-area production requires both low nuclei density and 2D crystal growth mode. As an emerging type of material, their large-area production remains a case-by-case practice. Here we present a general, efficient strategy for large-area 2DMCs. The method grows crystals on water surface to minimize the density of nuclei. By control-ling the interfacial tension of the water/solution system with a phase transfer surfactant, the spreading area of the solvent increases tens of times, leading to the space-confined 2D growth of molecular crystals...
March 9, 2018: Journal of the American Chemical Society
Bai Yang, Yue Wu, Xiaopan Li, Ronghai Yu
It is difficult to fabricate high-purity amorphous FeCo alloys by traditional physical methods due to their weak glass forming ability. In this work, the fully amorphous FeCo nanoalloys with high purity and good stability have been prepared by a direct chemical reduction of Fe2+ and Co2+ ions with NaBH₄ as the reducing agent and polyvinylpyrrolidone (PVP) as the surfactant. The morphologies, surface compositions and particle sizes with their distribution of these amorphous samples can be effectively tuned by the suitable PVP additions...
March 9, 2018: Nanomaterials
Rupam Dutta, Sangita Kundu, Nilmoni Sarkar
In the last two decades, researchers have extensively studied highly stable and ordered supramolecular assembly formation using oppositely charged surfactants. Thereafter, surface-active ionic liquids (SAILs), a special class of room temperature ionic liquids (RTILs), replace the surfactants to form various supramolecular aggregates. Therefore, in the last decade, the building blocks of the supramolecular aggregates (micelle, mixed micelle, and vesicular assemblies) have changed from oppositely charged surfactant/surfactant pair to surfactant/SAIL and SAIL/SAIL pair...
March 8, 2018: Biophysical Reviews
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