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Journal articles on the topic 'Surfactant aggregate'

Author: Grafiati

Published: 18 May 2024

Last updated: 31 July 2025

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1

Veldhuizen, R. A., S. A. Hearn, J. F. Lewis, and F. Possmayer. "Surface-area cycling of different surfactant preparations: SP-A and SP-B are essential for large-aggregate integrity." Biochemical Journal 300, no. 2 (1994): 519–24. http://dx.doi.org/10.1042/bj3000519.

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Surface-area cycling is an in vitro procedure for the conversion of large into small surfactant aggregates. In this procedure a tube containing a surfactant suspension is rotated end-over-end at 37 degrees C so that the surface area of the suspension changes twice each cycle. We have utilized this method to study the mechanisms involved in aggregate conversion. Several different surfactant preparations were analysed: (1) bovine natural surfactant, a sucrose-gradient-purified material containing surfactant phospholipid and surfactant-associated proteins (SP-) SP-A, SP-B and SP-C; (2) bovine lip

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2

Paul, Nawal K., Tyler Mercer, Hussein Al-Mughaid, et al. "Synthesis and properties of multiheaded and multitailed surfactants based on tripentaerythritol." Canadian Journal of Chemistry 93, no. 5 (2015): 502–8. http://dx.doi.org/10.1139/cjc-2014-0342.

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The surface and self-assembly properties of a family of multiheaded, multitailed surfactants based on a tripentaerythritol backbone are described. Critical aggregation concentrations of these unusual surfactant systems have been determined from surface tension measurements; aggregate sizes in the presence and absence of a small amount of added electrolyte have been obtained via dynamic light scattering, and the morphologies of the aggregates were examined from electron microscopy measurements. In general, when compared to conventional ionic and two-headed surfactants (and other recently synthe

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Veldhuizen, R. A., J. Marcou, L. J. Yao, L. McCaig, Y. Ito, and J. F. Lewis. "Alveolar surfactant aggregate conversion in ventilated normal and injured rabbits." American Journal of Physiology-Lung Cellular and Molecular Physiology 270, no. 1 (1996): L152—L158. http://dx.doi.org/10.1152/ajplung.1996.270.1.l152.

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Alveolar surfactant can be separated into two subtypes; large aggregates and small aggregates. Large aggregates represent the surface active form of surfactant and are the metabolic precursors of small aggregates. Previous studies examined the mechanism by which large aggregates are converted into small aggregates in vitro. We used intratracheal injection of radiolabeled large aggregates in rabbits to probe the aggregate conversion in vivo. After this injection, animals were mechanically ventilated for 60 min. After the animals were killed, the lungs were lavaged, and the percentage of radiola

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4

Ikegami, Machiko, Thomas R. Korfhagen, Jeffrey A. Whitsett, et al. "Characteristics of surfactant from SP-A-deficient mice." American Journal of Physiology-Lung Cellular and Molecular Physiology 275, no. 2 (1998): L247—L254. http://dx.doi.org/10.1152/ajplung.1998.275.2.l247.

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Mice that are surfactant protein (SP) A deficient [SP-A(−/−)] have no apparent abnormalities in lung function. To understand the contributions of SP-A to surfactant, the biophysical properties and functional characteristics of surfactant from normal [SP-A(+/+)] and SP-A(−/−) mice were evaluated. SP-A-deficient surfactant had a lower buoyant density, a lower percentage of large-aggregate forms, an increased rate of conversion from large-aggregate to small-aggregate forms with surface area cycling, increased sensitivity to inhibition of minimum surface tension by plasma protein, and no tubular m

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5

Chavez-Martinez, E. H., E. Cedillo-Cruz, and H. Dominguez. "Adsorption of metallic ions from aqueous solution on surfactant aggregates: a molecular dynamics study." Condensed Matter Physics 24, no. 2 (2021): 23601. http://dx.doi.org/10.5488/cmp.24.23601.

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Metallic ion adsorption on surfactant aggregates were studied with Molecular dynamics simulations. Using ionic salts, such as lead sulfate (PbSO4) and aluminum sulfate [Al2(SO4)3], adsorption of lead and aluminum were investigated at different salt concentrations and different surfactant aggregates (micelles) sizes. The micelles were constructed with spherical shapes composed of sodium dodecyl sulfate (SDS) anionic surfactants. The electrostatic interactions between the positive ions and the negative SDS headgroups promote capture of the metal particles on the aggregate surface. Metal adsorpti

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Veldhuizen, R. A., Y. Ito, J. Marcou, L. J. Yao, L. McCaig, and J. F. Lewis. "Effects of lung injury on pulmonary surfactant aggregate conversion in vivo and in vitro." American Journal of Physiology-Lung Cellular and Molecular Physiology 272, no. 5 (1997): L872—L878. http://dx.doi.org/10.1152/ajplung.1997.272.5.l872.

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Within the alveolar space pulmonary surfactant is converted from the surface active large aggregates (LA) to the inactive small aggregates (SA). This conversion is affected by a change in surface area, lung injury, breathing pattern, and protease activity. This study examined the effect of N-nitroso-N-methylurethane-induced acute lung injury on aggregate conversion in mechanically ventilated and spontaneously breathing rabbits. Both the in vitro surface area cycling techniques and the in vivo technique of intratracheally injecting radiolabeled LA were used for analyzing aggregate conversion. M

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Veldhuizen, R. A. W., K. Inchley, S. A. Hearn, J. F. Lewis, and F. Possmayer. "Degradation of surfactant-associated protein B (SP-B) during in vitro conversion of large to small surfactant aggregates." Biochemical Journal 295, no. 1 (1993): 141–47. http://dx.doi.org/10.1042/bj2950141.

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Pulmonary surfactant obtained from lung lavages can be separated by differential centrifugation into two distinct subfractions known as large surfactant aggregates and small surfactant aggregates. The large-aggregate fraction is the precursor of the small-aggregate fraction. The ratio of the small non-surface-active to large surface-active surfactant aggregates increases after birth and in several types of lung injury. We have utilized an in vitro system, surface area cycling, to study the conversion of large into small aggregates. Small aggregates generated by surface area cycling were separa

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Madsen, Jens, Gunna Christiansen, Lise Giehm, and Daniel Otzen. "Release of Pharmaceutical Peptides in an Aggregated State: Using Fibrillar Polymorphism to Modulate Release Levels." Colloids and Interfaces 3, no. 1 (2019): 42. http://dx.doi.org/10.3390/colloids3010042.

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Traditional approaches to achieve sustained delivery of pharmaceutical peptides traditionally use co-excipients (e.g., microspheres and hydrogels). Here, we investigate the release of an amyloidogenic glucagon analogue (3474) from an aggregated state and the influence of surfactants on this process. The formulation of peptide 3474 in dodecyl maltoside (DDM), rhamnolipid (RL), and sophorolipid (SL) led to faster fibrillation. When the aggregates were subjected to multiple cycles of release by repeated resuspension in fresh buffer, the kinetics of the release of soluble peptide 3474 from differe

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Liu, Z., D. A. Edwards, and R. G. Luthy. "Nonionic Surfactant Sorption onto Soil." Water Science and Technology 26, no. 9-11 (1992): 2337–40. http://dx.doi.org/10.2166/wst.1992.0731.

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Experiments in batch soil/aqueous systems were conducted to evaluate the sorption onto soil of four nonionic surfactants. At bulk solution surfactant concentration less than the respective critical micelle (aggregate) concentration (CMC or CAC), sorption can be assessed using a surface tension technique and can be characterized with a Freundlich isotherm. At bulk solution surfactant concentrations equal to or greater than the critical concentration, sorption of the micelle-forming surfactants can be assessed by a spectrophotometric technique with an azo dye and had a constant value; sorption o

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10

Cong, Peiliang, and Kexuan Yu. "Evaluation of the Grading and Morphology of Recycled Asphalt Pavement Clusters Using the Emulsification–Separation Disposal Method." Applied Sciences 15, no. 13 (2025): 7375. https://doi.org/10.3390/app15137375.

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This study proposes a method for separating asphalt and aggregates in recycled asphalt pavement (RAP) materials using surfactants as solvents. This method utilizes surfactants to soften the asphalt by reducing its surface tension, separating the RAP clusters, and washing away the asphalt from the RAP. The wastewater is recycled during the emulsification–separation process without discharge. Factors affecting the separation effect of RAP, including the type of anionic surfactants, the surfactant concentration, the emulsion-to-RAP ratio, temperature, the rotation rate and time, and the RAP’s par

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Oliveira, Isabel S., Sandra G. Silva, Andreia C. Gomes, M. Elisabete C. D. Real Oliveira, M. Luísa C. do Vale, and Eduardo F. Marques. "Cationic Serine-Based Gemini Surfactant:Monoolein Aggregates as Viable and Efficacious Agents for DNA Complexation and Compaction: A Cytotoxicity and Physicochemical Assessment." Journal of Functional Biomaterials 15, no. 8 (2024): 224. http://dx.doi.org/10.3390/jfb15080224.

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Cationic gemini surfactants have emerged as potential gene delivery agents as they can co-assemble with DNA due to a strong electrostatic association. Commonly, DNA complexation is enhanced by the inclusion of a helper lipid (HL), which also plays a key role in transfection efficiency. The formation of lipoplexes, used as non-viral vectors for transfection, through electrostatic and hydrophobic interactions is affected by various physicochemical parameters, such as cationic surfactant:HL molar ratio, (+/−) charge ratio, and the morphological structure of the lipoplexes. Herein, we investigated

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Lewis, J. F., M. Ikegami, and A. H. Jobe. "Altered surfactant function and metabolism in rabbits with acute lung injury." Journal of Applied Physiology 69, no. 6 (1990): 2303–10. http://dx.doi.org/10.1152/jappl.1990.69.6.2303.

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Lung injury was induced in rabbits with N-nitroso-N-methylurethane (NNNMU), and saturated phosphatidylcholine (Sat PC) pool sizes and phospholipid compositions were measured in alveolar wash subfractions isolated by differential centrifugation (large and small surfactant aggregates). Surfactant metabolism also was studied using intravascular and intratracheal radiolabels. Protein permeability, gas exchange, and compliance were significantly abnormal as lung injury progressed. At peak injury, there was a decrease in the large aggregate Sat PC pool size in alveolar wash accompanied by increased

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VELDHUIZEN, Ruud A. W., Li-Juan YAO, Stephen A. HEARN, Fred POSSMAYER, and James F. LEWIS. "Surfactant-associated protein A is important for maintaining surfactant large-aggregate forms during surface-area cycling." Biochemical Journal 313, no. 3 (1996): 835–40. http://dx.doi.org/10.1042/bj3130835.

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Alveolar surfactant can be separated into two major subfractions, the large surfactant aggregates (LAs) and the small surfactant aggregates (SAs). The surface-active LAs are the metabolic precursors of the inactive SAs. This conversion of LAs into SAs can be studied in vitro using a technique called surface-area cycling. We have utilized this technique to examine the effect of trypsin on aggregate conversion. Our results show that trypsin increases the conversion of LAs into SAs in a concentration- and time-dependent manner. Immunoblot analysis revealed that surfactant-associated Protein A (SP

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14

Gradova, Margaret A., Vladimir V. Artemov, and Anton V. Lobanov. "Aggregation behavior of tetraphenylporphyrin in aqueous surfactant solutions: Chiral premicellar J-aggregate formation." Journal of Porphyrins and Phthalocyanines 19, no. 07 (2015): 845–51. http://dx.doi.org/10.1142/s1088424615500595.

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Porphyrin-surfactant interactions in aqueous solutions are known to result in the selfassembly of various supramolecular structures, including pigment-surfactant complexes, J- and H-aggregates, and solubilized dye species. Detailed studies on the mechanisms of the intermolecular interactions governing the above self-assembly processes allow to predict the aggregation state and hence, the photophysical properties of the dye-surfactant assemblies in order to perform a direct synthesis of the desired porphyrin-based nanostructures at the appropriate experimental conditions. This paper describes a

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Cassidy, Marta A., and Gregory G. Warr. "Steric and Counterion Effects on Cationic Surfactant Self-Assembly into Micelles and Liquid Crystals." Australian Journal of Chemistry 56, no. 10 (2003): 1065. http://dx.doi.org/10.1071/ch03116.

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The roles of head-group size and counterion association on aggregate morphology in solution and lyotropic phases of cationic surfactants (tetradecyl trimethyl-, tetradecyl triethyl-, and tetradecyl tripropylammonium) are examined, using salicylate as a strongly binding counterion. Larger head groups are found to inhibit the formation of low-curvature structures such as bilayers, and salicylate binding excludes spherical micelles, so that both effects tend to favour locally cylindrical aggregates. Interfacial probes and ion flotation show that the binding of salicylate is reduced by increasing

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16

Monforte, Victor, Sanchez Almudena Lopez, Felipe Zurbano, et al. "Prophylaxis with nebulized liposomal amphotericin B for Aspergillus infection in lung transplant patients does not cause changes in the lipid content of pulmonary surfactant." Journal of Heart and Lung Transplantation 32, no. 3 (2013): 313–19. https://doi.org/10.1016/j.healun.2012.11.013.

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Abstract <strong>Background: </strong>Prophylaxis with inhaled liposomal amphotericin B has proven to be safe and effective for preventing infection due to Aspergillus spp in lung transplant recipients. However, the liposome contains a large quantity of phospholipids, and inhalation of these substances could potentially change the composition of pulmonary surfactant. The aim of this study was to determine the lipid composition of pulmonary surfactant in patients receiving inhaled liposomal amphotericin B prophylaxis. <strong>Methods: </strong>A prospective, open, controlled multicent

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17

Horowitz, A. D., K. Kurak, B. Moussavian, et al. "Preferential uptake of small-aggregate fraction of pulmonary surfactant in vitro." American Journal of Physiology-Lung Cellular and Molecular Physiology 273, no. 2 (1997): L468—L477. http://dx.doi.org/10.1152/ajplung.1997.273.2.l468.

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Homeostasis of pulmonary surfactant requires metabolic clearance of surfactant forms with decreased surface activity. Rabbit pulmonary surfactant was labeled in vivo with rhodamine-labeled dipalmitoylphosphatidylethanolamine (R-DPPE), isolated, and fractionated into large- and small-aggregate subfractions by differential centrifugation. Endocytosis of large (LA)- and small (SA)-aggregate surfactant by a mouse lung epithelial cell line (MLE-12) was evaluated in vitro by epifluorescence microscopy. More SA than LA surfactant was taken up by MLE-12 cells. Endocytosis of SA and LA surfactant was i

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Alamrew, Asres Simeneh, and Konrad Mollenhauer. "Advantages Of Filler And Surfactant Additive To Improve Moisture Sensitivity Of Hot Mix Asphalt Mixtures." IOP Conference Series: Materials Science and Engineering 1202, no. 1 (2021): 012011. http://dx.doi.org/10.1088/1757-899x/1202/1/012011.

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Abstract This research investigated the effect of mineral composition of aggregate on moisture sensitivity of bituminous mixtures and explored the benefits of hydrated lime filler and Wetfix BE surfactant additive to improve the resistance of the mix against moisture sensitivity. Basalt, quartzite, and limestone aggregates were selected based on their different mineralogy and 70 -100 penetration graded bitumen binders used during the study. Four laboratory tests the rolling bottle, shaking abrasion, pull-off tensile strength and indirect tensile strength tests were applied to study the effects

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KARAPETSAS, GEORGE, RICHARD V. CRASTER, and OMAR K. MATAR. "On surfactant-enhanced spreading and superspreading of liquid drops on solid surfaces." Journal of Fluid Mechanics 670 (January 25, 2011): 5–37. http://dx.doi.org/10.1017/s0022112010005495.

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The mechanisms driving the surfactant-enhanced spreading of droplets on the surface of solid substrates, and particularly those underlying the superspreading behaviour sometimes observed, are investigated theoretically. Lubrication theory for the droplet motion, together with advection–diffusion equations and chemical kinetic fluxes for the surfactant transport, leads to coupled evolution equations for the drop thickness, interfacial concentrations of surfactant monomers and bulk concentrations of monomers and micellar, or other, aggregates. The surfactant can be adsorbed on the substrate eith

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20

Ikegami, Machiko, Jeffrey A. Whitsett, Alan Jobe, Gary Ross, James Fisher, and Thomas Korfhagen. "Surfactant metabolism in SP-D gene-targeted mice." American Journal of Physiology-Lung Cellular and Molecular Physiology 279, no. 3 (2000): L468—L476. http://dx.doi.org/10.1152/ajplung.2000.279.3.l468.

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Mice with surfactant protein (SP)-D deficiency have three to four times more surfactant lipids in air spaces and lung tissue than control mice. We measured multiple aspects of surfactant metabolism and function to identify abnormalities resulting from SP-D deficiency. Relative to saturated phosphatidylcholine (Sat PC), SP-A and SP-C were decreased in the alveolar surfactant and the large-aggregate surfactant fraction. Although large-aggregate surfactant from SP-D gene-targeted [(−/−)] mice converted to small-aggregate surfactant more rapidly, surface tension values were comparable to values fo

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Jana, Tushar, and Arun K. Nandi. "Tailoring of the self-organized structure of sulfonated polyaniline from a fibrillar network to a colloidal aggregate." Journal of Materials Research 18, no. 7 (2003): 1691–97. http://dx.doi.org/10.1557/jmr.2003.0232.

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Self-organized structures of the sodium salt of sulfonated polyaniline (prepared from the leucoemeraldine base of polyaniline) in the presence of a mixture of cationic and nonionic surfactants were studied. It was used in the latex form, which has been prepared using a conventional method with sodium dodecyl sulfate. The cationic surfactant used was didodecyl dimethyl ammonium bromide, and the nonionic surfactant used was Triton-X-100. The supramolecular organization was made in aqueous medium by varying the concentrations of the components. A three-dimensional fibrillar network and colloidal

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Yadav, Ramesh, K. Chandramani Singh, S. R. Choudhary, and P. C. Jain. "Location of Phase Boundaries of Lyotropic Liquid Crystal Employing Positron Lifetime Spectroscopy and Electrical Conductivity Measurement." Materials Science Forum 733 (November 2012): 127–31. http://dx.doi.org/10.4028/www.scientific.net/msf.733.127.

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Different compositions of surfactant systems give rise to a rich variety of structures of aggregates. At higher concentrations of surfactant in water, the surfactant molecules aggregate to form lyotropic liquid crystals [1]. In the present work we have prepared two surfactant systems consisting of (i) 20% of cetyl-trimethyl-ammonium-bromide (CTAB) in water, and (ii) 30% of tetra-decyl-trimethyl-ammonium-bromide (TTAB) in water. Both the systems exhibit various lyotropic liquid crystal structures when an increasing amount of co-surfactant is added as third component [2, 3]. These liquid crystal

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Nusselder, Jan Jaap H., and Jan B. F. N. Engberts. "Surfactant structure and aggregate morphology. The urge for aggregate stability." Journal of the American Chemical Society 111, no. 13 (1989): 5000–5002. http://dx.doi.org/10.1021/ja00195a075.

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Raihanah, Nadhifa, Solihudin, and Rukiah. "The Effects of Surfactant on the Stability of SiO₂ nanofluid Prepared by Bead-milling Method." Journal of Physics: Conference Series 2344, no. 1 (2022): 012005. http://dx.doi.org/10.1088/1742-6596/2344/1/012005.

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Abstract Typical nanofluid containing metal or non-metallic nanoparticles dispersed in water with high surface energy. This condition causes aggregation and leads to the instability of the nanofluid dispersion in media. The inclusion of surfactants during the bead-milling process can increase the amount of dispersion stability of nanofluids with bigger particle sizes. The aim of this study was to determine the optimum surfactant in stabilizing SiO2 nanofluid and investigate the effect of surfactant addition during the bead-milling process since the effect of different types of surfactant in th

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Costa, Telma, Diego de Azevedo, Beverly Stewart, et al. "Interactions of a zwitterionic thiophene-based conjugated polymer with surfactants." Polymer Chemistry 6, no. 46 (2015): 8036–46. http://dx.doi.org/10.1039/c5py01210d.

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Structural organization and photoluminescence properties of zwitterionic conjugated polymer–surfactant assemblies depend on specific and non-specific polymer–surfactant interactions within the aggregate.

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D Primastari, S., Y. Kusumastuti, M. Handayani, and Rochmadi. "Functionalization of multi-walled carbon nanotube (MWCNT) with CTACe surfactant and polyethylene glycol as potential drug carrier." IOP Conference Series: Earth and Environmental Science 963, no. 1 (2022): 012033. http://dx.doi.org/10.1088/1755-1315/963/1/012033.

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Abstract Multi-walled Carbon Nanotube (MWCNT) pure is easy to form aggregate, making it difficult to apply as a drug carrier since it can be toxic to the body. It can be overcome by functionalization using surfactants, like cetyltrimethyl ammonium trichloro-monobromo-cerate (CTACe) and polyethylene glycol (PEG). First, MWCNT was functionalized with CTACe surfactant, then further PEG 6000 was used with several MWCNT-CTACe ratios. The functionalization was conducted under ultrasonic treatment, then followed by filtration, washing, and drying. The functionalized MWCNT underwent dispersion tests u

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Russo, Thomas A., Lori A. Bartholomew, Bruce A. Davidson, et al. "Total extracellular surfactant is increased but abnormal in a rat model of gram-negative bacterial pneumonia." American Journal of Physiology-Lung Cellular and Molecular Physiology 283, no. 3 (2002): L655—L663. http://dx.doi.org/10.1152/ajplung.00071.2002.

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An in vivo rat model was used to evaluate the effects of Escherichia coli pneumonia on lung function and surfactant in bronchoalveolar lavage (BAL). Total extracellular surfactant was increased in infected rats compared with controls. BAL phospholipid content in infected rats correlated with the severity of alveolar-capillary leak as reflected in lavage protein levels ( R2= 0.908, P < 0.0001). Western blotting showed that levels of surfactant protein (SP)-A and SP-D in BAL were significantly increased in both large and small aggregate fractions at 2 and 6 h postinstillation of E. coli. SP-B

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Harada, Takunori, Hiroshi Moriyama, Hiromi Takahashi, et al. "Spectroscopic Characterization of Supramolecular Chiral Porphyrin Homoassociates at the Air–Water Interface." Applied Spectroscopy 68, no. 11 (2014): 1235–40. http://dx.doi.org/10.1366/13-07432.

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The water-soluble 4-sulfonatophenyl meso-substituted porphyrin (TPPS) dye exhibits a transformation to a chiral self-aggregate from the non-aggregated species (diprotonated H4TPPS2–) at low concentration (no more than 1 × 10−5 M). Immobilization of supramolecular chiral porphyrin homoassociates was mediated by the electrostatic interaction between the anionic TPPS molecule and cationic surfactant monolayer at the air–water interface. With the immobilization, a reversible transformation from monomeric TPPS to J-aggregate ( M→J) could be changed into an irreversible ( M→J), which is desirable fo

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Lehrsch, G. A., R. E. Sojka, and A. C. Koehn. "Surfactant effects on soil aggregate tensile strength." Geoderma 189-190 (November 2012): 199–206. http://dx.doi.org/10.1016/j.geoderma.2012.06.015.

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Ridder, Kristin B., Craig J. Davies-Cutting, and Ian W. Kellaway. "Surfactant solubility and aggregate orientation in hydrofluoroalkanes." International Journal of Pharmaceutics 295, no. 1-2 (2005): 57–65. http://dx.doi.org/10.1016/j.ijpharm.2005.01.027.

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Davidson, Bruce A., Paul R. Knight, Zhengdong Wang, et al. "Surfactant alterations in acute inflammatory lung injury from aspiration of acid and gastric particulates." American Journal of Physiology-Lung Cellular and Molecular Physiology 288, no. 4 (2005): L699—L708. http://dx.doi.org/10.1152/ajplung.00229.2004.

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This study examines surfactant dysfunction in rats with inflammatory lung injury from intratracheal instillation of hydrochloric acid (ACID, pH 1.25), small nonacidified gastric particles (SNAP), or combined acid and small gastric particles (CASP). Rats given CASP had the most severe lung injury at 6, 24, and 48 h based on decreases in arterial oxygenation and increases in erythrocytes, total leukocytes, neutrophils, total protein, and albumin in bronchoalveolar lavage (BAL). The content of large surfactant aggregates in BAL was reduced in all forms of aspiration injury, but decreases were gre

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Zhong, Hua, Lei Yang, Guangming Zeng, et al. "Aggregate-based sub-CMC solubilization of hexadecane by surfactants." RSC Advances 5, no. 95 (2015): 78142–49. http://dx.doi.org/10.1039/c5ra12388g.

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SDBS or Triton X-100 at sub-CMC concentrations enhances hexadecane solubilization due to the aggregate formation mechanism. The sub-CMC aggregate size decreases with increasing surface excess of the surfactant.

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Puligandla, Pramod S., Tara Gill, Lynda A. McCaig, et al. "Alveolar environment influences the metabolic and biophysical properties of exogenous surfactants." Journal of Applied Physiology 88, no. 3 (2000): 1061–71. http://dx.doi.org/10.1152/jappl.2000.88.3.1061.

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Several factors have been shown to influence the efficacy of exogenous surfactant therapy in the acute respiratory distress syndrome. We investigated the effects of four different alveolar environments (control, saline-lavaged, N-nitroso- N-methylurethane, and hydrochloric acid) on the metabolic and functional properties of two exogenous surfactant preparations: bovine lipid extract surfactant and recombinant surfactant-associated protein (SP) C drug product (rSPC) administered to each of these groups. The main difference between these preparations was the lack of SP-B in the rSPC. Our results

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Maitra, Gayatri, Kevin Inchley, Richard J. Novick, Ruud A. W. Veldhuizen, James F. Lewis, and Fred Possmayer. "Acute lung injury and lung transplantation influence in vitro subtype conversion of pulmonary surfactant." American Journal of Physiology-Lung Cellular and Molecular Physiology 282, no. 1 (2002): L67—L74. http://dx.doi.org/10.1152/ajplung.2002.282.1.l67.

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The effects of surfactant treatment on surfactant subtype conversion after lung injury were examined. Dogs were subjected to hyperventilation for 8 h with or without surfactant treatment. Lungs were stored for 17 h, and the right lung was transplanted and reperfused for 6 h. Conversion of large aggregate (LA) surfactant to small aggregates was investigated using in vitro surface area cycling. LA from transplanted lungs (Transplant-LA) from the nontreated group converted more rapidly than Transplant-LA from the treated group. Transplant-LA from both groups converted more rapidly than LA from no

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Wei, Xin, Jie Li, Xiangfei Geng, et al. "Synthesis, Surface Activity, Emulsifiability and Bactericidal Performance of Zwitterionic Tetrameric Surfactants." Molecules 29, no. 18 (2024): 4286. http://dx.doi.org/10.3390/molecules29184286.

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In this paper, a series of tetrameric surfactants (4CnSAZs, n = 12, 14, 16) endowed with zwitterionic characteristic were synthesized by a simple and convenient method and their structures were characterized by FT-IR, 1H NMR and elemental analysis. Their physicochemical properties were studied using the Wilhelmy plate method, fluorescence spectra and dynamic light scattering technique. 4CnSAZs have higher surface activities and tend to adsorb at the air/water surface rather than self-assembling in aqueous solution. The thermodynamic parameters obtained from surface tension measurements show th

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Zhang, Yongmin, Weiwei Kong, Cheng Wang, et al. "Switching wormlike micelles of selenium-containing surfactant using redox reaction." Soft Matter 11, no. 38 (2015): 7469–73. http://dx.doi.org/10.1039/c5sm01515d.

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Wormlike micelles based on a selenium-containing surfactant and a commercially anionic surfactant reversibly respond to H<sub>2</sub>O<sub>2</sub> and vitamin C, and show circulatory gel/sol transition, reflecting changes in aggregate morphology from entangled worms to vesicles.

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Oliveira, Isabel S., Sandra G. Silva, Maria Luísa do Vale, and Eduardo F. Marques. "Model Catanionic Vesicles from Biomimetic Serine-Based Surfactants: Effect of the Combination of Chain Lengths on Vesicle Properties and Vesicle-to-Micelle Transition." Membranes 13, no. 2 (2023): 178. http://dx.doi.org/10.3390/membranes13020178.

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Mixtures of cationic and anionic surfactants often originate bilayer structures, such as vesicles and lamellar liquid crystals, that can be explored as model membranes for fundamental studies or as drug and gene nanocarriers. Here, we investigated the aggregation properties of two catanionic mixtures containing biomimetic surfactants derived from serine. The mixtures are designated as 12Ser/8-8Ser and 14Ser/10-10Ser, where mSer is a cationic, single-chained surfactant and n-nSer is an anionic, double-chained one (m and n being the C atoms in the alkyl chains). Our goal was to investigate the e

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Dharaiya, Nilesh, Urja Patel, Debes Ray, Vinod K. Aswal, Nandhibatla V. Sastry, and Pratap Bahadur. "Different pH triggered aggregate morphologies in sodium oleate–cationic surfactants mixed systems." New Journal of Chemistry 41, no. 17 (2017): 9142–51. http://dx.doi.org/10.1039/c6nj03871a.

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Pérez, Lourdes, Aurora Pinazo, M. C. Morán, and Ramon Pons. "Aggregation Behavior, Antibacterial Activity and Biocompatibility of Catanionic Assemblies Based on Amino Acid-Derived Surfactants." International Journal of Molecular Sciences 21, no. 23 (2020): 8912. http://dx.doi.org/10.3390/ijms21238912.

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The surface activity, aggregates morphology, size and charge characteristics of binary catanionic mixtures containing a cationic amino acid-derived surfactant N(π), N(τ)-bis(methyl)-L-Histidine tetradecyl amide (DMHNHC14) and an anionic surfactant (the lysine-based surfactant Nα-lauroyl-Nεacetyl lysine (C12C3L) or sodium myristate) were investigated for the first time. The cationic surfactant has an acid proton which shows a strong pKa shift irrespective of aggregation. The resulting catanionic mixtures exhibited high surface activity and low critical aggregation concentration as compared with

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Cid, Antonio, Oscar Moldes, Juan Mejuto, and Jesus Simal-Gandara. "Interaction of Caffeic Acid with SDS Micellar Aggregates." Molecules 24, no. 7 (2019): 1204. http://dx.doi.org/10.3390/molecules24071204.

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Micellar systems consisting of a surfactant and an additive such as an organic salt or an acid usually self-organize as a series of worm-like micelles that ultimately form a micellar network. The nature of the additive influences micellar structure and properties such as aggregate lifetime. For ionic surfactants such as sodium dodecyl sulfate (SDS), CMC decreases with increasing temperature to a minimum in the low-temperature region beyond which it exhibits the opposite trend. The presence of additives in a surfactant micellar system also modifies monomer interactions in aggregates, thereby al

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Charde, Rashmi P., Brian van Devener, and Michael M. Nigra. "Surfactant- and Ligand-Free Synthesis of Platinum Nanoparticles in Aqueous Solution for Catalytic Applications." Catalysts 13, no. 2 (2023): 246. http://dx.doi.org/10.3390/catal13020246.

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The synthesis of surfactant-free and organic ligand-free metallic nanoparticles in solution remains challenging due to the nanoparticles’ tendency to aggregate. Surfactant- and ligand-free nanoparticles are particularly desirable in catalytic applications as surfactants, and ligands can block access to the nanoparticles’ surfaces. In this contribution, platinum nanoparticles are synthesized in aqueous solution without surfactants or bound organic ligands. Pt is reduced by sodium borohydride, and the borohydride has a dual role of reducing agent and weakly interacting stabilizer. The 5.3 nm Pt

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Russo, Thomas A., Zhengdong Wang, Bruce A. Davidson, et al. "Surfactant dysfunction and lung injury due to theE. colivirulence factor hemolysin in a rat pneumonia model." American Journal of Physiology-Lung Cellular and Molecular Physiology 292, no. 3 (2007): L632—L643. http://dx.doi.org/10.1152/ajplung.00326.2006.

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This study tests the hypothesis that the virulence factor hemolysin (Hly) expressed by extraintestinal pathogenic Escherichia coli contributes to surfactant dysfunction and lung injury in a rat model of gram-negative pneumonia. Rats were instilled intratracheally with CP9 (wild type, Hly-positive), CP9 hlyA (Hly-minus), CP9 /pEK50 (supraphysiological Hly), or purified LPS. At 6 h postinfection, rats given CP9 had a decreased percentage content of large surfactant aggregates in cell-free bronchoalveolar lavage (BAL), decreased large aggregate surface activity, decreased PaO2/FiO2ratio, increase

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Pashirova, Tatiana N., Andrei V. Bogdanov, Lenar I. Musin, et al. "Nanoscale isoindigo-carriers: self-assembly and tunable properties." Beilstein Journal of Nanotechnology 8 (February 1, 2017): 313–24. http://dx.doi.org/10.3762/bjnano.8.34.

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Over the last decade isoindigo derivatives have attracted much attention due to their high potential in pharmacy and in the chemistry of materials. In addition, isoindigo derivatives can be modified to form supramolecular structures with tunable morphologies for the use in drug delivery. Amphiphilic long-chain dialkylated isoindigos have the ability to form stable solid nanoparticles via a simple nanoprecipitation technique. Their self-assembly was investigated using tensiometry, dynamic light scattering, spectrophotometry, and fluorometry. The critical association concentrations and aggregate

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Allen, Victoria, Margaret Oulton, Dora Stinson, Josee MacDonald, and Alexander Allen. "Alveolar metabolism of natural vs. synthetic surfactants in preterm newborn rabbits." Journal of Applied Physiology 90, no. 1 (2001): 198–204. http://dx.doi.org/10.1152/jappl.2001.90.1.198.

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We compared the recoveries of four surfactant preparations: two natural [term fetal rabbit surfactant (FRS) and adult rabbit surfactant (ARS)] and two commercially available preparations [apoprotein-based Survanta (S) and synthetic Exosurf (E)] from 27-day gestation rabbit pups treated at birth and ventilated up to 120 min. At 5, 60, and 120 min, we measured the recovery of the heavy-aggregate, metabolically active form (H) and the light-aggregate, nonsurface active metabolic breakdown form (L) of alveolar surfactant and determined the phospholipid content and composition of the intracellularl

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Chaban, Vitaly V., Andre Arruda, and Eudes Eterno Fileti. "Polypeptide A9K at nanoscale carbon: a simulation study." Physical Chemistry Chemical Physics 17, no. 39 (2015): 26386–93. http://dx.doi.org/10.1039/c5cp04565g.

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McGowan, F. X., M. lkegami, E. K. Motoyama, et al. "ALTERED SURFACTANT AGGREGATE FRACTIONS FOLLOWING PEDIATRIC CARDIOPULMONARY BYPASS." Anesthesiology 77, Supplement (1992): A1138. http://dx.doi.org/10.1097/00000542-199209001-01138.

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Sen, Sobhan, Dipankar Sukul, Partha Dutta, and Kankan Bhattacharyya. "Photoisomerization of merocyanine 540 in polymer-surfactant aggregate." Journal of Chemical Sciences 114, no. 1 (2002): 83–91. http://dx.doi.org/10.1007/bf02709984.

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Okuzaki, H., and Y. Osada. "Ordered-Aggregate Formation by Surfactant-Charged Gel Interaction." Macromolecules 28, no. 1 (1995): 380–82. http://dx.doi.org/10.1021/ma00105a054.

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Haritonovs, Viktors. "Evaluation of polyaminoamide as a surfactant additive in hot mix asphalt." Baltic Journal of Road and Bridge Engineering 10, no. 2 (2015): 112–17. http://dx.doi.org/10.3846/bjrbe.2015.14.

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The phenomenon of breaking the bond between the aggregates and the bitumen is known as stripping. Strip-ping of asphalt films from the surface of aggregate particles results in premature failure of asphalt pavement. This causes weakening of pavement resistance to rutting and fatigue. Furthermore, moisture damage increases the susceptibility of pavement to reveling, a distress that causes the loss of skid resistance on surface of the road and deterioration of pavement. Surfactant additive or adhesive agent is a surface-active agent that changes (lowers) the surface tension of rock materials. In

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Chithralekha, N., and A. Panneerselvam. "Physico-Chemical Analysis on Some Polymers in Aqueous Surfactant Solution at Different Temperatures: Acoustical, UV and FTIR Studies." Asian Journal of Chemistry 31, no. 3 (2019): 674–78. http://dx.doi.org/10.14233/ajchem.2019.21771.

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The ultrasonic velocity, density and viscosity in mixtures of sorbitan sesquioleate and poly(vinyl pyrrolidone) (PVP), poly(vinyl alcohol) (PVA) and poly(ethylene glycol) (PEG) in different concentration ranges are measured at different temperatures (303, 313 and 323 K). From the experimental data, other related acoustical parameters such as adiabatic compressibility (β), intermolecular free length (Lf), internal pressure (πi), Rao’s constant (Ra), relaxation time (τ), acoustical impedance (Za), absorption coefficient (α/f2), free volume (Vf), cohesive energy (CE) and solvation number (Sn) hav

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