%0 Journal Article
%T Polymer Coating and Lipid Phases Regulate Semiconductor Nanorods＊ Interaction with Neuronal Membranes: A Modeling Approach
%J -
%D 2019
%R https://doi.org/10.1021/acschemneuro.8b00466
%X The interplay between nanoparticles (NPs) and cell membranes is extremely important with regard to using NPs in biology applications. With the aim of unraveling the dominating factors on the molecular scale, we have studied the interaction between polymer-coated semiconductor nanorods (NRs) made of cadmium selenium/cadmium sulfur and model lipid membranes. The zeta potential (汎) of the NRs was tuned from having a negative value (ˋ24 mV) to having a positive one (+11 mV) by changing the amine content in the polymer coating. Supported lipid bilayers (SLBs) and lipid monolayers (LMs) were used as model membranes. Lipid mixtures containing anionic or cationic lipids were employed in order to change the membrane 汎 from ˋ77 to +49 mV; lipids with saturated hydrophobic chains were used to create phase-separated gel domains. NR adsorption to the SLBs was monitored by quartz crystal microbalance with dissipation monitoring; interactions with LMs with the same lipid composition were measured by surface pressure每area isotherms. The results showed that the NRs only interact with the model membrane if the mutual 忖汎 is higher than 70 mV; at the air每water interface, positively charged NRs remove lipids from the anionic lipid mixtures, and the negative ones penetrate the space between the polar heads in the cationic mixtures. However, the presence of gel domains in the membrane inhibits this interaction. The results of the Derjaguin每Landau每Verwey每Overbeek model frame indicate that the interaction occurs not only due to electrostatic and van der Waals forces, but also due to steric and/or hydration forces
%U https://pubs.acs.org/doi/10.1021/acschemneuro.8b00466