Influence of inorganic and organic counter-cations on the surface properties and self-assembly of cyclic lipopeptide surfactin

2021 ◽  
Vol 626 ◽  
pp. 126973
Author(s):  
Toshiaki Taira ◽  
Satohiro Yanagisawa ◽  
Tomohiro Imura
Keyword(s):  
Surface Properties ◽  
Self Assembly ◽  
Cyclic Lipopeptide ◽  
Inorganic And Organic

scholarly journals Nanoparticle interaction with model lung surfactant monolayers

2009 ◽  
Vol 7 (suppl_1) ◽  
Author(s):  
Rakesh Kumar Harishchandra ◽  
Mohammed Saleem ◽  
Hans-Joachim Galla
Keyword(s):  
Surface Properties ◽  
Self Assembly ◽  
Current Knowledge ◽  
Surface Film ◽  
Lung Surfactant ◽  
Hydrophobic Surface ◽  
Surface Pattern ◽  
Lipid Monolayers ◽  
Water Interface ◽  
Air Water Interface

One of the most important functions of the lung surfactant monolayer is to form the first line of defence against inhaled aerosols such as nanoparticles (NPs), which remains largely unexplored. We report here, for the first time, the interaction of polyorganosiloxane NPs (AmorSil20: 22 nm in diameter) with lipid monolayers characteristic of alveolar surfactant. To enable a better understanding, the current knowledge about an established model surface film that mimics the surface properties of the lung is reviewed and major results originating from our group are summarized. The pure lipid components dipalmitoylphosphatidylcholine and dipalmitoylphosphatidylglycerol have been used to study the biophysical behaviour of their monolayer films spread at the air–water interface in the presence of NPs. Film balance measurements combined with video-enhanced fluorescence microscopy have been used to investigate the formation of domain structures and the changes in the surface pattern induced by NPs. We are able to show that NPs are incorporated into lipid monolayers with a clear preference for defect structures at the fluid–crystalline interface leading to a considerable monolayer expansion and fluidization. NPs remain at the air–water interface probably by coating themselves with lipids in a self-assembly process, thereby exhibiting hydrophobic surface properties. We also show that the domain structure in lipid layers containing surfactant protein C, which is potentially responsible for the proper functioning of surfactant material, is considerably affected by NPs.

Diblock fluoroacrylate copolymers from two initiators: synthesis, self-assembly and surface properties

2012 ◽  
Vol 22 (43) ◽  
pp. 23078 ◽  
Author(s):  
Xia Dong ◽  
Ling He ◽  
Na Wang ◽  
Jun-Yan Liang ◽  
Ming-Jun Niu ◽  
...  
Keyword(s):  
Surface Properties ◽  
Self Assembly

scholarly journals Self-Assembly of the Cyclic Lipopeptide Daptomycin: Spherical Micelle Formation Does Not Depend on the Presence of Calcium Chloride

ChemPhysChem ◽  
2016 ◽  
Vol 17 (14) ◽  
pp. 2118-2122 ◽  
Author(s):  
Steven Kirkham ◽  
Valeria Castelletto ◽  
Ian William Hamley ◽  
Katsuaki Inoue ◽  
Robert Rambo ◽  
...  
Keyword(s):  
Calcium Chloride ◽  
Self Assembly ◽  
Micelle Formation ◽  
Spherical Micelle ◽  
Cyclic Lipopeptide

Programmable Self-Assembly Across the Micro and Nano Scales

2005 ◽  
Author(s):  
Karl F. Bo¨hringer
Keyword(s):  
Surface Properties ◽  
Self Assembly ◽  
Surface Forces ◽  
Massively Parallel ◽  
Rfid Tags ◽  
Promising Alternative ◽  
On Demand ◽  
Self Assembling ◽  
Binding Forces ◽  
Realtime Control

Massively parallel self-assembling systems present a promising alternative to conventional manufacturing. Recently, various successful instances of self-assembly have been demonstrated, including applications for commercial products such as RFID tags; however, the full impact of this approach will only be realized once these systems can be programmed or reconfigured on demand (i.e., essentially in software, and without significant hardware changes). In this presentation, we review several projects that lead towards such programmable self-assembling systems. A key concept to achieve this goal is the “programmable surface”, i.e., an engineered surface whose properties (surface forces, hydrophobicity, friction, etc.) can be controlled with high spatial and temporal resolution. We present several projects covering a broad range of issues from realtime control of surface properties, to designs that optimize binding forces between self-assembling components, to computational and algorithmic issues in the modeling of self-assembling systems.

Fabrication of highly ordered microporous thin films by PS-b-PAA self-assembly and investigation of their tunable surface properties

2008 ◽  
Vol 18 (6) ◽  
pp. 683 ◽  
Author(s):  
Chengyin Wang ◽  
Yindao Mao ◽  
Deyan Wang ◽  
Qishu Qu ◽  
Gongjun Yang ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Properties ◽  
Self Assembly

Controlling Surface Properties with Peptides: New Methods in Molecular Self-Assembly

1990 ◽  
Vol 218 ◽  
Author(s):  
Troy Wilson ◽  
Mark D. Bednarski
Keyword(s):  
Amino Acids ◽  
Surface Properties ◽  
Convenient Method ◽  
Self Assembly ◽  
Proteolytic Enzymes ◽  
Synthesis And Characterization ◽  
Simple Method ◽  
New Methods ◽  
Monomolecular Films

As part of our investigation into the design and applications of proteolytic enzymes, we required a convenient method to attach peptides to the surface of a variety of materials. In this paper we report the synthesis and characterization of a class of peptide derivatized lipids (PDL's) that can be self-assembled into monomolecular films. These films can be used to control interfacial properties such as wetting and adhesion and provide a simple method to coat surfaces with amino acids.

scholarly journals Fuzzy modeling applied to optical and surface properties of a ferrocenylsiloxane polyamide solution

2012 ◽  
Vol 10 (1) ◽  
pp. 194-204
Author(s):  
Marius Pislaru ◽  
Silvia Curteanu ◽  
Maria Cazacu
Keyword(s):  
Surface Tension ◽  
Surface Properties ◽  
Self Assembly ◽  
Fuzzy Inference ◽  
A Priori ◽  
Fuzzy Model ◽  
Fuzzy Rule ◽  
Inference System ◽  
Inference Systems ◽  
Available Information

AbstractA fuzzy model was designed to predict changes in surface tension and maximum absorbance due to self-assembly in a DMF solution of poly{1,1′-ferrocene-diamide-[1,3-bis(propylene) tetramethyl-disiloxane} as a function of temperature and concentration. The building of fuzzy rule-based inference systems appears as a grey-box because it allows interpretation of the knowledge contained in the model as well as its improvement with a-priori knowledge. The method provides accurate results and increases the efficiency of utilizing the available information in the model. Small mean squared errors (0.0064 for absorbance and 0.79 for surface tension) and strong correlations between experiment and simulated results (0.93 and 0.97, respectively) were found during model validation. The results showed that it is feasible to apply a Mamdani fuzzy inference system to the estimation of optical and surface properties of a ferrocenylsiloxane polyamide solution.

scholarly journals Self-Assembly of Amphiphilic Biotransesterified β-Cyclodextrins: Supramolecular Structure of Nanoparticles and Surface Properties

Langmuir ◽  
2017 ◽  
Vol 33 (32) ◽  
pp. 7917-7928 ◽  
Author(s):  
Jean-Luc Putaux ◽  
Christine Lancelon-Pin ◽  
François-Xavier Legrand ◽  
Marion Pastrello ◽  
Luc Choisnard ◽  
...  
Keyword(s):  
Surface Properties ◽  
Self Assembly ◽  
Supramolecular Structure ◽  
Structure Of Nanoparticles

scholarly journals Layer-by-Layer Encapsulation of Herbicide-Degrading Bacteria for Improved Surface Properties and Compatibility in Soils

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3814
Author(s):  
Reut Gal ◽  
Neriya Perez-Lapid ◽  
Yael Zvulunov ◽  
Adi Radian
Keyword(s):  
Surface Properties ◽  
Self Assembly ◽  
Chemical Properties ◽  
Polymeric Coating ◽  
Layer By Layer ◽  
Microscopy Imaging ◽  
E Coli ◽  
Degrading Bacteria ◽  
Herbicide Atrazine

E. coli cells overexpressing the enzyme atrazine chlorohydrolase were coated using layer-by-layer self-assembly. The polymeric coating was designed to improve the surface properties of the cells and create positively charged, ecologically safe, bio-hybrid capsules that can efficiently degrade the herbicide atrazine in soils. The physio-chemical properties of the bacteria/polymer interface were studied as a function of the polymeric composition of the shell and its thickness. Characterization of cell viability, enzyme activity, morphology, and size of the bio-capsules was done using fluorescence spectroscopy, BET and zeta potential measurements and electron microscopy imaging. Out of several polyelectrolytes, the combination of polydiallyldimethylammonium chloride and polysodium 4-styrenesulfonate improved the surface properties and activity of the cells to the greatest extent. The resulting bio-hybrid capsules were stable, well-dispersed, with a net positive charge and a large surface area compared to the uncoated bacteria. These non-viable, bio-hybrid capsules also exhibited a kinetic advantage in comparison with uncoated cells. When added to soils, they exhibited continuous activity over a six-week period and atrazine concentrations declined by 84%. Thus, the concept of layer-by-layer coated bacteria is a promising avenue for the design of new and sustainable bioremediation and biocatalytic platforms.

Sign in / Sign up

Export Citation Format

Share Document