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Impact of Engineered Carbon Nanodiamonds on the Collapse Mechanism of Model Lung Surfactant Monolayers at the Air-Water Interface

Chakraborty, Aishik
Hertel, Amanda
Ditmars, Hayley
Dhar, Prajnaparamita
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Abstract
Understanding interactions between inhaled nanoparticles and lung surfactants (LS) present at the air-water interface in the lung, is critical to assessing the toxicity of these nanoparticles. Specifically, in this work, we assess the impact of engineered carbon nanoparticles (ECN) on the ability of healthy LS to undergo reversible collapse, which is essential for proper functioning of LS. Using a Langmuir trough, multiple compression-expansion cycles are performed to assess changes in the surface pressure vs. area isotherms with time and continuous cyclic compression-expansion. Further, theoretical analysis of the isotherms is used to calculate the ability of these lipid systems to retain material during monolayer collapse, due to interactions with ECNs. These results are complemented with fluorescence images of alterations in collapse mechanisms in these monolayer films. Four different model phospholipid systems, that mimic the major compositions of LS, are used in this study. Together, our results show that the ECN does not impact the mechanism of collapse. However, the ability to retain material at the interface during monolayer collapse, as well as re-incorporation of material after a compression-expansion cycle is altered to varying extent by ECNs and depends on the composition of the lipid mixtures.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
Date
2020-02-07
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Publisher
MDPI
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Keywords
Monolayer collapse, Engineered nanoparticle, Surface pressure-area isotherm, Folding, Lung surfactants
Citation
Chakraborty, A., Hertel, A., Ditmars, H., & Dhar, P. (2020). Impact of Engineered Carbon Nanodiamonds on the Collapse Mechanism of Model Lung Surfactant Monolayers at the Air-Water Interface. Molecules (Basel, Switzerland), 25(3), 714. https://doi.org/10.3390/molecules25030714
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