Biopolymer-Thin Film Interactions

MRS Proceedings ◽

10.1557/proc-292-175 ◽

1992 ◽

Vol 292 ◽

Author(s):

K. M. Maloney ◽

D. W. Grainger

Keyword(s):

Thin Film ◽

Fluorescence Microscopy ◽

Self Assembly ◽

Protein Docking ◽

Lipid Monolayer ◽

Protein Recognition ◽

Lipid Monolayers ◽

Water Interface ◽

Air Water Interface

AbstractBiopolymer self assembly in heterogeneous lipid monolayers at the air-water interface was investigated. Fluorescence microscopy allowed the visualization of protein recognition and binding to these microstructured membranes. Mimicking proteininduced membrane microstructuring and protein docking was achieved in ternary mixed lipid monolayer systems.

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Nanoparticle interaction with model lung surfactant monolayers

Journal of The Royal Society Interface ◽

10.1098/rsif.2009.0329.focus ◽

2009 ◽

Vol 7 (suppl_1) ◽

Cited By ~ 83

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.

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Specific Protein Docking to Chelator Lipid Monolayers Monitored by FT-IR Spectroscopy at the Air–Water Interface

Angewandte Chemie International Edition in English ◽

10.1002/anie.199603171 ◽

1996 ◽

Vol 35 (3) ◽

pp. 317-320 ◽

Cited By ~ 12

Author(s):

Lutz Schmitt ◽

Tom M. Bohanon ◽

Steffen Denzinger ◽

Helmut Ringsdorf ◽

Robert Tampé

Keyword(s):

Ir Spectroscopy ◽

Specific Protein ◽

Protein Docking ◽

Lipid Monolayers ◽

Water Interface ◽

Air Water Interface ◽

Ft Ir ◽

Ft Ir Spectroscopy

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Tadpole-Shaped POSS-Based Copolymers and the Aggregation Behavior at Air/Water Interface

Advances in Condensed Matter Physics ◽

10.1155/2018/3787843 ◽

2018 ◽

Vol 2018 ◽

pp. 1-10 ◽

Cited By ~ 4

Author(s):

Lin Zhu ◽

Fang Chen ◽

Xiaoyan Ma ◽

Xiu Qiang ◽

Zhiguang Li ◽

...

Keyword(s):

Thin Film ◽

Block Copolymers ◽

Surface Pressure ◽

Self Assembly ◽

Aggregation Behavior ◽

Structure Evolution ◽

Interfacial Rheology ◽

Water Interface ◽

Block Sequence ◽

Air Water Interface

The aggregation behavior of three tadpole-shaped Polyhedral oligomeric silsesquioxane (POSS) based block copolymers using different blocks poly(methyl methacrylate) (PMMA) and poly(trifluoroethyl methacrylate) (PTFEMA) with different block sequence and ratio (POSS-PTFEMA161-b-PMMA236, POSS-PMMA277-b-PTFEMA130, and POSS-PMMA466-b-PTFEMA172) was investigated on the air-water interface. The interfacial rheology of three block copolymers was studied by surface pressure isotherm, compression modulus measurements, and compression and expansion hysteresis analysis on the Langmuir trough. The block sequence and ratio play a great role in self-assembly behavior at the interface. Based on surface pressure isotherm analysis, a thin film with low elasticity was achieved for the POSS-PTFEMA161-b-PMMA236. Moreover, for the block copolymer with same segment sequence (POSS-PMMA2-b-PTFEMA), the thin film compression capability is increased with increasing the PMMA ratio. The morphology of the deposited LB thin film was illustrated by atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). We observed that a thin film was composed by crater-shaped quasi-2D micelles for POSS-PTFEMA-b-PMMA, while it was proved that only flaky texture was observed for both POSS-PMMA277-b-PTFEMA130 and POSS-PMMA466-b-PTFEMA172. The thickness and area of flaky aggregates were greatly related to PMMA ratio. The different interface self-assembly structure evolution was proposed based on the interfacial rheology and thin film morphology studies.

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