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https://www.readbyqxmd.com/read/28108328/distribution-of-phospholipid-based-formulations-in-the-skin-investigated-by-combined-atr-ftir-and-tape-stripping-experiments
#1
Martin Wolf, Maria Halper, Raffaela Pribyl, Dieter Baurecht, Claudia Valenta
The spatial distribution of exogenous substances in the stratum corneum (SC) could have an influence on their skin irritation potential. In this study it was possible to monitor the distribution of phospholipids with their phosphatidylcholine scaffold on porcine ear skin by combining tape stripping and in vitro ATR-FTIR spectroscopy. Significant vibrational modes in the spectra could be successfully assigned to the functional groups of the molecules. Thus it was possible to track the phospholipids without the need of their deuterated form by calculating difference spectra from the treated - untreated skin samples...
January 17, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28107616/superhydrophilic-antireflective-periodic-mesoporous-organosilica-coating-on-flexible-polyimide-substrate-with-strong-abrasion-resistance
#2
Jing Wang, Cong Zhang, Chunming Yang, Ce Zhang, Mengchao Wang, Jing Zhang, Yao Xu
Superhydrophilic antireflective periodic mesoporous organosilica (PMO) coating was prepared on flexible polyimide substrate via solvent-evaporation-induced self-assembly (SEISA) method, in which tetraethoxysilane (TEOS) and a special bridged silsesquioxane were used as reactants. The bridged silsesquioxane, EG-BSQ, was synthesized through the stoichiometric reaction between 3-glycidoxyporpyltrimethoxysilane (GPTMS) and ethylene diamine (EDA) at 60 (○)C with no catalyst. Under the influence of surfactant, TEOS and EG-BSQ co-condensed and enclosed the ordered mesporous in the coating...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106386/macromolecularly-caged-carbon-nanoparticles-for-intracel-lular-trafficking-via-switchable-photo-luminescence
#3
Santosh K Misra, Indrajit Srivastava, Indu Tripathi, Enrique A Daza, Fatemeh Ostadhossein, Dipanjan Pan
Reversible switching of photoluminescence (PL) of carbon nanoparticles (CNP) can be achieved with counter-ionic macromolecular caging and de-caging at the nanoscale. A negatively charged uncoated, 'bare' CNP with high luminescence loses its PL when positively charged macromolecules are wrapped around its surface. Prepared caged carbons could regain their emission only through interaction with anionic surfactant mole-cules, representing anionic amphiphiles of endocytic membranes. This process could be verified by gel electrophoresis, spectroscopically and in vitro confocal imaging studies...
January 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28106364/a-novel-strategy-for-one-pot-synthesis-of-gold-nanoplates-on-carbon-nanotube-sheet-as-an-effective-flexible-sers-substrate
#4
Wenbo Xin, Jenn-Ming Yang, Chao Li, Mark S Goorsky, Larry Carlson, Igor De Rosa
In this work, we have demonstrated a novel route for one-pot synthesis of two dimensional gold nanoplates (2-D AuNPLs) on carbon nanotube (CNT) sheet. Well-defined AuNPLs are grafted onto CNT sheet via a facile hydrothermal reduction process, during which bromine ions are employed as the surfactant for gold anisotropic growth. Scanning electron microscopy (SEM) shows large-scale AuNPLs with micrometer-scaled length and sub-100 nm thickness are deposited uniformly on the CNT sheet. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) results confirm the synthesized AuNPLs are single-crystalline with preferential {111} orientation...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106334/rapid-determination-of-the-critical-micelle-concentration-by-taylor-dispersion-analysis-in-capillaries-using-both-direct-and-indirect-detection
#5
Jan Petr
The critical micelle concentration belongs is a basic characteristic of surfactants. In this paper, the process of formation of micelles is studied by Taylor dispersion analysis using capillary electrophoresis instrumentation as a substituent of capillary liquid chromatography. New methods for determination of critical micelle concentration are presented. Sodium octylbenzene sulfonate and sodium dodecylsulfate are used as model compounds with and without chromophore. Two novel approaches based on indirect UV detection and indirect Taylor dispersion analysis with direct UV detection are introduced for the determination of critical micelle concentration value of surfactant without any chromophore...
January 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28106203/analytical-form-of-the-autocorrelation-function-for-the-fluorescence-correlation-spectroscopy
#6
Robert Hołyst, Andrzej Poniewierski, Xuzhu Zhang
Fluorescence correlation spectroscopy (FCS) can provide information about diffusion coefficients and rate constants of chemical reactions in small systems of interacting molecules. However, the interpretation of FCS experiments depends crucially on the model of the autocorrelation function for the fluorescence intensity fluctuations. In this theoretical work, we consider a system of fluorescent molecules that diffuse and interact with massive particles, e.g. surfactant micelles. Using the general formalism of FCS, we derive a new analytical approximation of the autocorrelation function for systems in which both diffusion and a binary reaction occur...
January 20, 2017: Soft Matter
https://www.readbyqxmd.com/read/28106004/wetting-behavior-of-multi-walled-carbon-nanotube-nanofluids
#7
Adya Karthikeyan, Sylvain Coulombe, Anne-Marie Kietzig
Nanofluids - engineered colloidal suspensions in base liquids - have captivated the interest of researchers over the last two decades for various existing as well as emerging technological applications. The main impetus for the synthesis of such novel nanocomposite liquids is the potential to alter properties of the base liquid, such as its viscosity, thermal conductivity, and surface tension, and to introduce specific optical and magnetic properties. Numerous studies suggest trends and explanations for the effects associated with the addition of nanoparticles, and that deviation from the base liquid properties are dependent on nanoparticle concentration...
January 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28103395/influence-of-lipid-content-in-a-corn-oil-preparation-on-the-bioaccessibility-of-%C3%AE-carotene-a-comparison-of-low-fat-and-high-fat-samples
#8
Ziyuan Xia, David Julian McClements, Hang Xiao
Some individuals with fat maldigestion have compromised digestive systems, which causes the incomplete hydrolyzation of ingested lipids within the gastrointestinal tract (GIT). We studied the influence of high-fat (20%) and low-fat (4%) contents on the bioaccessibility of a highly hydrophobic nutraceutical (β-carotene) through a simulated GIT model consisting of mouth, stomach, and small intestine phases. The low-fat and high-fat values were chosen to simulate low-fat and high-fat diets. The triglycerides in the low-fat system were fully digested, whereas those in the high-fat system were only partially digested, thereby mimicking the digestive systems of individuals who exhibit fat maldigestion...
January 19, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28102703/glyoxal-and-methylglyoxal-determination-in-urine-by-surfactant-assisted-dispersive-liquid-liquid-microextraction-and-lc
#9
Natalia Campillo, Pilar Viñas, Javier Marín, Manuel Hernández-Córdoba
AIM: Two important markers of oxidative stress, glyoxal and methylglyoxal, are preconcentrated from human urine by surfactant-assisted dispersive liquid-liquid microextraction and separated by LC-fluorescence. METHODS/RESULTS: Derivatization was carried out overnight with 0.8 mM 2,3-diaminonaphthalene at 4°C. For surfactant-assisted dispersive liquid-liquid microextraction, 500 µl buffer solution (pH 10.5) and 25 µl 0.03 M Triton X-114 were added to 2.5 ml of the sample and the mixture was made up to 10 ml before the rapid injection of 75 µl 1-undecanol (extractant solvent) and 0...
January 19, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28102358/model-for-large-area-monolayer-coverage-of-polystyrene-nanospheres-by-spin-coating
#10
Abhishek Chandramohan, Nikolai V Sibirev, Vladimir G Dubrovskii, Michael C Petty, Andrew J Gallant, Dagou A Zeze
Nanosphere lithography, an inexpensive and high throughput technique capable of producing nanostructure (below 100 nm feature size) arrays, relies on the formation of a monolayer of self-assembled nanospheres, followed by custom-etching to produce nanometre size features on large-area substrates. A theoretical model underpinning the self-ordering process by centrifugation is proposed to describe the interplay between the spin speed and solution concentration. The model describes the deposition of a dense and uniform monolayer by the implicit contribution of gravity, centrifugal force and surface tension, which can be accounted for using only the spin speed and the solid/liquid volume ratio...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28100402/the-randomized-controlled-trial-of-late-surfactant-effects-on-respiratory-outcomes-at-1-year-corrected-age
#11
Roberta L Keller, Eric C Eichenwald, Anna Maria Hibbs, Elizabeth E Rogers, Katherine C Wai, Dennis M Black, Philip L Ballard, Jeanette M Asselin, William E Truog, Jeffrey D Merrill, Mark C Mammel, Robin H Steinhorn, Rita M Ryan, David J Durand, Catherine M Bendel, Ellen M Bendel-Stenzel, Sherry E Courtney, Ramasubbareddy Dhanireddy, Mark L Hudak, Frances R Koch, Dennis E Mayock, Victor J McKay, Jennifer Helderman, Nicolas F Porta, Rajan Wadhawan, Lisa Palermo, Roberta A Ballard
OBJECTIVE: To determine the effects of late surfactant on respiratory outcomes determined at 1-year corrected age in the Trial of Late Surfactant (TOLSURF), which randomized newborns of extremely low gestational age (≤28 weeks' gestational age) ventilated at 7-14 days to late surfactant and inhaled nitric oxide vs inhaled nitric oxide-alone (control). STUDY DESIGN: Caregivers were surveyed in a double-blinded manner at 3, 6, 9, and 12 months' corrected age to collect information on respiratory resource use (infant medication use, home support, and hospitalization)...
January 16, 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/28100323/-high-risk-factors-and-clinical-characteristics-of-massive-pulmonary-hemorrhage-in-infants-with-extremely-low-birth-weight
#12
Dan Chen, Meng Wang, Xin Wang, Xue-Wei Ding, Rui-Hua Ba, Jian Mao
OBJECTIVE: To explore the high-risk factors and analyze the clinical characteristics of massive pulmonary hemorrhage (MPH) in infants with extremely low birth weight (ELBW). METHODS: Two hundred and eleven ELBW infants were included in this study. Thirty-five ELBW infants who were diagnosed with MPH were labelled as the MPH group, and 176 ELBW infants without pulmonary hemorrhage were labelled as the control group. The differences in clinical characteristics, mortality rate, and incidence of complications between the two groups were analysed...
January 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28099980/challenges-faced-in-translating-the-benefits-of-surfactant-replacement-therapy-to-a-resource-limited-setting
#13
N Hamilton, Helen Trotman
Aim To determine the challenges, if any, in translating the benefits of surfactant replacement therapy (SRT) to a resource-limited setting. Method This was a retrospective descriptive study comparing the outcome of 75 cases who received surfactant and 69 controls who did not at the University Hospital of the West Indies during the period 2001 to 2011. Descriptive analyses were performed. Statistical significance was taken at the level p < 0.05. Results Only 13% of neonates with respiratory distress syndrome received surfactant therapy...
January 18, 2017: American Journal of Perinatology
https://www.readbyqxmd.com/read/28099846/cell-of-origin-links-histotype-spectrum-to-immune-microenvironment-diversity-in-non-small-cell-lung-cancer-driven-by-mutant-kras-and-loss-of-lkb1
#14
Ashwini S Nagaraj, Jenni Lahtela, Annabrita Hemmes, Teijo Pellinen, Sami Blom, Jennifer R Devlin, Kaisa Salmenkivi, Olli Kallioniemi, Mikko I Mäyränpää, Katja Närhi, Emmy W Verschuren
Lung cancers exhibit pronounced functional heterogeneity, confounding precision medicine. We studied how the cell of origin contributes to phenotypic heterogeneity following conditional expression of Kras(G12D) and loss of Lkb1 (Kras;Lkb1). Using progenitor cell-type-restricted adenoviral Cre to target cells expressing surfactant protein C (SPC) or club cell antigen 10 (CC10), we show that Ad5-CC10-Cre-infected mice exhibit a shorter latency compared with Ad5-SPC-Cre cohorts. We further demonstrate that CC10(+) cells are the predominant progenitors of adenosquamous carcinoma (ASC) tumors and give rise to a wider spectrum of histotypes that includes mucinous and acinar adenocarcinomas...
January 17, 2017: Cell Reports
https://www.readbyqxmd.com/read/28099801/highly-specific-and-sensitive-fluorescent-nanoprobes-for-image-guided-resection-of-sub-millimeter-peritoneal-tumors
#15
Aaron H Colby, Samantha Berry, Ann M Moran, Kristine Amber Pasion, Rong Liu, Yolonda L Colson, Nelson Ruiz-Opazo, Mark W Grinstaff, Victoria L M Herrera
A current challenge in the treatment of peritoneal carcinomatosis is the inability to detect, visualize, and resect small or microscopic tumors of pancreatic, ovarian or mesothelial origin. In these diseases, the completeness of primary tumor resection is directly correlated with patient survival, and, hence, identifying small sub-mm tumors (i.e., disseminated disease) is critical. Thus, new imaging techniques and probes are needed to improve cytoreductive surgery and patient outcomes. Highly-fluorescent rhodamine-labeled expansile nanoparticles (HFR-eNPs) are described for use as a visual aid during cytoreductive surgery of pancreatic carcinomatosis...
January 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28099026/unimer-assisted-exfoliation-for-high-concentrated-aqueous-dispersion-solutions-of-single-and-few-layered-van-der-waals-materials
#16
Changbong Yeon, Inyeal Lee, Gil-Ho Kim, Sun Jin Yun
We suggest unimer-assisted exfoliation method for the exfoliation of Van der Waals two-dimensional (2D) materials such as graphene, MoS2, and h-BN, and show that the micellar size is a critical parameter for enhancing the exfoliation efficiency. To explain the effectiveness of the unimers on the exfoliation, the influence of micellar size of a biocompatible block copolymer, Pluronic F-68, is evaluated in view of the yield and thickness of exfoliated 2D flakes. By the addition of water-soluble alcohols, the surfactants exist in the form of unimer, which facilitates the intercalation into the layered materials and their exfoliation...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28098979/electroactive-self-assembled-monolayers-detect-micelle-formation
#17
Eric R Dionne, Antonella Badia
The interfacial electrochemistry of self-assembled monolayers (SAMs) of ferrocenyldodecanethiolate on gold (FcC12SAu) electrodes is applied to detect the micellization of some common anionic surfactants, sodium n-alkyl sulfates, sodium n-alkyl sulfonates, sodium diamyl sulfosuccinate, and sodium dodecanoate, in aqueous solution by cyclic voltammetry. The apparent formal redox potential (Eº´SAM) of the FcC12SAu SAM is used to track changes in the concentration of the unaggregated surfactant anions and determine the critical micelle concentration (cmc)...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098974/surfactant-free-preparation-of-au-resveratrol-hollow-nanoparticles-with-photothermal-performance-and-antioxidant-activity
#18
Wenjing Wang, Qi Tang, Tianrong Yu, Xing Li, Yang Gao, Jing Li, Yi Liu, Li Rong, Zhigang Wang, Hongchen Sun, Hao Zhang, Bai Yang
Nanocomposites based on hollow Au nanostructures have gained considerable attention in theranostics applications because of their unique plasmonic structures and attractive physicochemical properties. The exploration of feasible and facile methods for constructing multifunctional nanocomposites combined with bioactive molecules is greatly needed for the development of multifunctional theranostics platforms. In this work, resveratrol, a natural polyphenol with antioxidant activity and cancer-chemopreventive propertyies is employed as the reducing agent cum coating agent for the surfactant-free preparation of Au@resveratrol hollow NPs (Au@Res HNPs)...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098883/developmental-expression-of-toll%C3%A2-like-receptors-in-the-guinea-pig-lung
#19
Lingjie Ma, Jiali Yang, Li Yang, Juan Shi, Jing Xue, Yong Li, Xiaoming Liu
The guinea pig is a useful model for investigating infectious and non‑infectious lung diseases due to the sensitivity of its respiratory system and susceptibility to infectious agents. Toll‑like receptors (TLRs) are important components of the innate immune response and are critical for lung immune function. In the present study, the differentiation of epithelial cells in the guinea pig lung was examined during gestation by studying anatomic morphology and the major epithelial cell types using cell type‑specific markers...
January 17, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28098315/a-ph-responsive-wormlike-micellar-system-of-a-noncovalent-interaction-based-surfactant-with-a-tunable-molecular-structure
#20
Wanli Kang, Pengxiang Wang, Haiming Fan, Hongbin Yang, Caili Dai, Xia Yin, Yilu Zhao, Shujun Guo
Responsive wormlike micelles are very useful in a number of applications, whereas it is still challenging to create dramatic viscosity changes in wormlike micellar systems. Here we developed a pH-responsive wormlike micellar system based on a noncovalent constructed surfactant, which is formed by the complexation of N-erucamidopropyl-N,N-dimethylamine (UC22AMPM) and citric acid at the molar ratio of 3 : 1 (EACA). The phase behavior, aggregate microstructure and viscoelasticity of EACA solutions were investigated by macroscopic appearance observation, rheological and cryo-TEM measurements...
January 18, 2017: Soft Matter
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