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Surfactant D

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https://read.qxmd.com/read/30767526/interfacial-water-features-at-the-air-water-interface-as-influenced-by-charged-surfactants
#1
Vu N T Truong, Xuming Wang, Liem Xuan Dang, Jan D Miller
The features of interfacial water at air-water interfaces of anionic sodium dodecyl sulfate (SDS) and cationic dodecyl amine hydrochloride (DDA) solutions were examined by combining sum frequency generation (SFG) vibrational spectroscopy measurements and molecular dynamics simulations (MDS). The SFG spectra revealed that interfacial water molecules for SDS solutions were highly-ordered compared with those for DDA solutions. To elucidate this observation, in addition to agreement with the literature in regards to the interfacial electric field at the interfaces, we investigated the features of interfacial water molecules with respect to their network and their interaction with surfactant head groups...
February 15, 2019: Journal of Physical Chemistry. B
https://read.qxmd.com/read/30758020/tuning-gelled-lyotropic-liquid-crystals-llcs-probing-the-influence-of-different-low-molecular-weight-gelators-on-the-phase-diagram-of-the-system-h-2-o-nacl-genapol-la070
#2
Katja Steck, Jan H van Esch, David K Smith, Cosima Stubenrauch
Gelled lyotropic liquid crystals (LLCs) are highly tunable multi-component materials. By studying a selection of low molecular weight gelators (LMWGs), we find gelators that form self-assembled gels in LLCs without influencing their phase boundaries. We studied the system H2O/NaCl-Genapol LA070 in the presence of (a) the organogelators 12-hydroxyoctadecanoic acid (12-HOA) and 1,3:2,4-dibenzylidene-d-sorbitol (DBS) and (b) the hydrogelators N,N'-dibenzoyl-l-cystine (DBC) and a tris-amido-cyclohexane derivative (HG1)...
February 13, 2019: Soft Matter
https://read.qxmd.com/read/30753482/colonic-epithelial-surfactant-protein-d-expression-correlates-with-inflammation-in-clinical-colonic-inflammatory-bowel-disease
#3
Anders B Nexoe, Bartosz Pilecki, Sebastian Von Huth, Steffen Husby, Andreas A Pedersen, Sönke Detlefsen, Niels Marcussen, Jesper B Moeller, Uffe Holmskov, Grith L Sorensen
Background: Inflammatory bowel diseases (IBD) are chronic disorders of the gastrointestinal tract. Surfactant protein D (SP-D) is expressed in the intestinal epithelium and is essential for innate host defense and regulation of inflammatory responses. Genetic variations of SP-D are associated with IBD, but the effects of SP-D in clinical disease development have not been clarified. We hypothesized that colonic epithelial SP-D expression is increased in parallel with intestinal inflammation with the capacity to dampen deleterious effects...
February 8, 2019: Inflammatory Bowel Diseases
https://read.qxmd.com/read/30744430/bronchoalveolar-fluid-and-plasma-inflammatory-biomarkers-in-contemporary-ards-patients
#4
Renee D Stapleton, Benjamin T Suratt, Margaret J Neff, Mark M Wurfel, Lorraine B Ware, John T Ruzinski, Ellen Caldwell, Teal S Hallstrand, Polly E Parsons
PURPOSE: Bronchoalveolar fluid (BALF) and plasma biomarkers are often endpoints in early phase randomized trials (RCTs) in acute respiratory distress syndrome (ARDS). With ARDS mortality decreasing, we analyzed baseline biomarkers in samples from contemporary ARDS patients participating in a prior RCT and compared these to historical controls. MATERIALS AND METHODS: Ninety ARDS adult patients enrolled in the parent trial. BALF and blood were collected at baseline, day 4 ± 1, and day 8 ± 1...
February 12, 2019: Biomarkers: Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals
https://read.qxmd.com/read/30743857/alcohol-ethoxylates-significantly-synergize-pesticides-than-alkylphenol-ethoxylates-considering-bioactivity-against-three-pests-and-joint-toxicity-to-daphnia-magna
#5
Bei-Xing Li, Xiu-Yu Pang, Peng Zhang, Jin Lin, Xiao-Xu Li, Yang Liu, Hua Li, Feng Liu, Wei Mu
Seeking alternatives for alkylphenol ethoxylates (APEOs) have been a heavily researched topic in the surfactant industry and agricultural systems. In this study, the combined effects of different ethoxylates and pesticides on the bioactivity against three pests and toxicological risks to Daphnia magna were investigated. Results showed that alcohol ethoxylates (AEOs) had higher synergistic effects on the bioactivity of pesticides against Spodoptera exigua, Agrotis ipsilon and Aphis citricola than did APEOs. In terms of the joint toxicity of the ethoxylates and pesticides to D...
December 10, 2018: Science of the Total Environment
https://read.qxmd.com/read/30737716/rapid-and-versatile-pre-treatment-for-quantification-of-multi-walled-carbon-nanotubes-in-the-environment-using-microwave-induced-heating
#6
Yang He, Souhail R Al-Abed, Phillip M Potter, Dionysios D Dionysiou
The concerns regarding potential environmental release and ecological risks of multi-walled carbon nanotubes (MWCNTs) rise with their increased production and use. As a result, there is the need for an analytical method to determine the environmental concentration of MWCNTs. Although several methods have been demonstrated for the quantification of well-characterized MWCNTs, applying these methods to field samples is still a challenge due to interferences from unknown characteristics of MWCNTs and environmental media...
February 8, 2019: Environmental Science and Pollution Research International
https://read.qxmd.com/read/30725234/the-in-vitro-synergistic-denaturation-effect-of-heat-and-surfactant-on-photosystem-i-isolated-from-arthrospira-platensis
#7
Daoyong Yu, Jinxiao Lan, Naseer Ullah Khan, Quan Li, Fengxi Xu, Guihong Huang, Hai Xu, Fang Huang
Photosystem I (PSI) generates the most negative redox potential found in nature, and the performance of solar energy conversion into alternative energy sources in artificial systems highly depends on the thermal stability of PSI. Thus, understanding thermal denaturation is an important prerequisite for the use of PSI at elevated temperatures. To assess the thermal stability of surfactant-solubilized PSI from cyanobacteria Arthrospira Platensis, the synergistic denaturation effect of heat and surfactant was studied...
February 6, 2019: Photosynthesis Research
https://read.qxmd.com/read/30721158/a-sftpc-brichos-mutant-links-epithelial-er-stress-and-spontaneous-lung-fibrosis
#8
Jeremy Katzen, Brandie D Wagner, Alessandro Venosa, Meghan Kopp, Yaniv Tomer, Scott J Russo, Alvis C Headen, Maria C Basil, James M Stark, Surafel Mulugeta, Robin R Deterding, Michael F Beers
Alveolar type 2 (AT2) cell endoplasmic reticulum (ER) stress is a prominent feature in adult and pediatric interstitial lung disease (ILD and ChILD), but in vivo models linking AT2 cell ER stress to ILD have been elusive. Based on a clinical ChILD case we identified a critical cysteine residue in the Surfactant Protein C gene (SFTPC) BRICHOS domain whose mutation induced ER stress in vitro. To model this in vivo, we generated a knock-in model expressing a cysteine-to-glycine substitution at codon 121 (C121G) in the Sftpc gene...
February 5, 2019: JCI Insight
https://read.qxmd.com/read/30716549/toxicity-mitigation-and-bioaccessibility-of-the-cationic-surfactant-cetyltrimethylammonium-bromide-in-a-sorbent-modified-biodegradation-study
#9
Niels Timmer, David Gore, David Sanders, Todd Gouin, Steven T J Droge
Biodegradation potential of cationic surfactants may be hampered by inhibition of inoculum at concentrations required to accurately measure inorganic carbon. At >0.3 mg/L cetyltrimethylammonium bromide (CTAB) negatively impacted degradation of the reference compound aniline. We used silicon dioxide (SiO2 ) and illite as inorganic sorbents to mitigate toxicity of CTAB by lowering freely dissolved concentrations. In an OECD Headspace Test we tested whether 16.8 mg/L CTAB was readily biodegradable in presence of two concentrations of SiO2 and illite...
January 28, 2019: Chemosphere
https://read.qxmd.com/read/30716381/evaluation-of-self-nanoemulsifying-drug-delivery-systems-using-multivariate-methods-to-optimize-permeability-of-captopril-oral-films
#10
Sawani D Talekar, Rahul V Haware, Rutesh H Dave
The present report demonstrates a quality by design approach to understand and optimize self-nanoemulsifying orodispersible films (SNEODF) of captopril for hypertension. A central composite experimental design was used to study the formulation parameters effects (primary emulsion, aqueous phase, and surfactant) on the film properties (globule size, film burst, adhesion, Young's moduli, disintegration time, tensile strength and dissolution). Principle component analysis (PCA) and principle component regression (PCR) were employed to identify and quantify the effects of formulation variables and physico-mechanical properties of the film on the drug permeability...
February 1, 2019: European Journal of Pharmaceutical Sciences
https://read.qxmd.com/read/30708008/removal-of-malachite-green-from-aqueous-solutions-using-a-modified-chitosan-composite
#11
T K Arumugam, P Krishnamoorthy, N R Rajagopalan, S Nanthini, D Vasudevan
The synthesis of a novel composite adsorbent prepared from coir pith activated carbon (CPAC), chitosan and sodium dodecyl sulphate (SDS, an anionic surfactant) is reported. The characterisation of the composite was done using SEM, XRD, UV-visible and IR spectroscopy studies. The effectiveness of the composite was made for the removal of a toxic cationic dye, malachite green (MG) from waste water based on adsorption studies. The reaction conditions for the adsorption studies were optimized based on initial dye concentration, dose rate, reaction time, pH and temperature...
January 29, 2019: International Journal of Biological Macromolecules
https://read.qxmd.com/read/30701855/clinical-significance-of-the-determination-of-surfactant-proteins-a-and-d-in-assessing-the-activity-of-lung-sarcoidosis
#12
V D Beketov, M V Lebedeva, N A Mukhin, A G Serova, A B Ponomarev, E N Popova, A Sh Yanakaeva, V A Solomka, A V Kondrashov, D V Konovalov
AIM: To study the clinical significance of SP-A, SP-D in assessing the activity of idiopathic pulmonary fibrosis and sarcoidosis. We examined 81 patients with morphologically confirmed diagnoses of idiopathic pulmonary fibrosis (ILF) and sarcoidosis, a control group of 20 healthy individuals. The MSCT of the thoracic organs of the chest was performed, the diffusivity of the lungs was examined, oxygen saturation was determined. In the serum, the surfactant proteins SP-A and SP-D were determined by the enzyme-linked immunosorbent assay...
April 19, 2018: Terapevticheskiĭ Arkhiv
https://read.qxmd.com/read/30691337/the-effect-of-capping-agents-on-the-toxicity-of-silver-nanoparticles-to-danio-rerio-embryos
#13
N Abramenko, T B Demidova, Yu A Krutyakov, P M Zherebin, E Y Krysanov, L M Kustov, W Peijnenburg
Addition of capping agents like surfactants and polymers during the synthesis of nanoparticles may affect the stability and toxicity of dispersions of nanoparticles. This study revealed the impact of anionic, cationic, and amphoteric surfactants and a cationic polymer on the physical and chemical properties, stability and behavior of silver nanomaterials, as well as on the toxicity of nanosized silver particles with respect to zebrafish embryos. Some of the stabilizers applied were shown to significantly affect embryos of Danio rerio...
January 29, 2019: Nanotoxicology
https://read.qxmd.com/read/30689390/m-s-m-cationic-gemini-and-zwitterionic-surfactants-spacer-dependent-synergistic-interactions
#14
Aleisha Arlene McLachlan, Kulbir Singh, Emily Piggott, Michael James McAlduff, Shannon MacLennan, Victoria Sandre, Taryn Reid, D Gerrard Marangoni
Critical micelle concentration (cmc) values have been determined for the mixed zwitterionic/cationic gemini systems of N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (ZW3-12)/N,N'bis(dimethyldodecyl)-,-alkanediammonium dibromide (12-s-12) systems. The cmcs for the mixed systems were determined through conductivity measurements. The degree of nonideality of the interaction in the mixed micelle (m), for each system, was determined according to Rubingh's nonideal solution theory. In most cases, the systems exhibited negative deviations (-m values) at high surfactant mole fractions of zwittergent (ZW3-12)...
January 28, 2019: Journal of Physical Chemistry. B
https://read.qxmd.com/read/30686314/tidal-changes-in-pao-2-and-their-relationship-to-cyclical-lung-recruitment-derecruitment-in-a-porcine-lung-injury-model
#15
D C Crockett, J N Cronin, N Bommakanti, R Chen, C E W Hahn, G Hedenstierna, A Larsson, A D Farmery, F Formenti
BACKGROUND: Tidal recruitment/derecruitment (R/D) of collapsed regions in lung injury has been presumed to cause respiratory oscillations in the partial pressure of arterial oxygen (PaO2 ). These phenomena have not yet been studied simultaneously. We examined the relationship between R/D and PaO2 oscillations by contemporaneous measurement of lung-density changes and PaO2 . METHODS: Five anaesthetised pigs were studied after surfactant depletion via a saline-lavage model of R/D...
February 2019: British Journal of Anaesthesia
https://read.qxmd.com/read/30678045/pneumoproteins-in-offshore-drill-floor-workers
#16
Niels E Kirkhus, Bente Ulvestad, Lars Barregard, Øivind Skare, Raymond Olsen, Yngvar Thomassen, Dag G Ellingsen
The aim was to assess pneumoproteins and a certain biomarker of systemic inflammation in drill floor workers exposed to airborne contaminants generated during drilling offshore, taking into consideration serum biomarkers of smoking, such as nicotine (S-Nico) and cotinine. Blood samples of club cell protein 16 (CC-16), surfactant protein D (SP-D) and C-reactive protein (CRP) were collected before and after a 14-day work period from 65 drill floor workers and 65 referents. Air samples of oil mist, drilling mud components and elemental carbon were collected in person...
January 23, 2019: International Journal of Environmental Research and Public Health
https://read.qxmd.com/read/30676031/stabilization-of-highly-concentrated-colloidal-suspension-of-pristine-metallic-nanoparticles
#17
Nirmal Kumar Katiyar, Krishanu Biswas, Chandra Sekhar Tiwary, Leonardo D Machado, Raju Kumar Gupta
The colloidal suspension containing a high concentration of metallic nanoparticles (NPs) find potential applications in flexible electronic printing, nanofluids, healthcare, and antifouling coating etc. Here, we demonstrate a generic, easily scalable, simple and contamination free cryogenic temperature grinding method, which can effectively be used to prepare pristine NPs and can be stabilized in polar liquids in a high-concentrations. These surfactant free pristine nanoparticles have been found to remain dispersed in different polar liquids (CH3OH, C2H5OH, Glycol etc...
January 24, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/30672154/surfactant-protein-d-as-a-marker-for-pulmonary-complications-in-pediatric-patients-with-sickle-cell-disease-relation-to-lung-function-tests
#18
Azza A Tantawy, Amira A Adly, Fatma S E Ebeid, Eman A Ismail, Mahitab M Hussein, Randa M Shaarawy, Reham A Kamel
BACKGROUND: Surfactant protein D (SP-D) is considered a candidate biomarker for lung integrity and for disease progression. AIM: We determined the level of SP-D in children and adolescents with SCD and assessed its possible relation to pulmonary complications and lung function. METHODS: Serum SP-D levels were assessed in 50 SCD patients compared with 30 healthy controls. High-resolution computerized tomography (HRCT) of the chest was done...
January 22, 2019: Pediatric Pulmonology
https://read.qxmd.com/read/30669485/magnetic-mixed-micelles-composed-of-a-non-ionic-surfactant-and-nitroxide-radicals-containing-a-d-glucosamine-unit-preparation-stability-and-biomedical-application
#19
Kota Nagura, Yusa Takemoto, Fumi Yoshino, Alexey Bogdanov, Natalia Chumakova, Andrey Kh Vorobiev, Hirohiko Imai, Tetsuya Matsuda, Satoshi Shimono, Tatsuhisa Kato, Naoki Komatsu, Rui Tamura
Metal-free magnetic mixed micelles (mean diameter: < 20 nm) were prepared by mixing the biocompatible non-ionic surfactant Tween 80 and the non-toxic, hydrophobic pyrrolidine- N -oxyl radicals bearing a D-glucosamine unit in pH 7.4 phosphate-buffered saline (PBS). The time-course stability and in vitro magnetic resonance imaging (MRI) contrast ability of the mixed micelles was found to depend on the length of the alkyl chain in the nitroxide radicals. It was also confirmed that the mixed micelles exhibited no toxicity in vivo and in vitro and high stability in the presence of a large excess of ascorbic acid...
January 19, 2019: Pharmaceutics
https://read.qxmd.com/read/30660908/ecotoxicological-assessment-of-synthetic-and-biogenic-surfactants-using-freshwater-cladoceran-species
#20
Vanessa Santana Vieira Santos, Edgar Silveira, Boscolli Barbosa Pereira
Surfactants have been continuously detected within aquatic environments as a consequence of their use on a global scale. Lipopeptides are biosurfactants naturally produced by Bacillus subtilis that have been explored as green alternatives. The assessment of ecotoxicological parameters of synthetic and biogenic surfactants are required for evaluating toxicity values and to verify the eco-friendly behaviour of the biological compounds. This study aimed to conduct toxicity testing for different surfactants - sodium dodecyl sulphate and Triton X-100 - and biosurfactants - surfactin, iturin and fengycin - at different concentrations using Daphnia magna as model organism and Dendrocephalus brasiliensis as alternative test species for monitoring of pollutants in tropical freshwaters...
January 11, 2019: Chemosphere
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