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Optimizing Polyethylene Glycol Coating for Stealth Nanodiamonds.

Edoardo Donadoni^1,2, Paulo Siani^1,2, Simone Gambari¹

¹Department of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, Milano 20125, Italy.

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|March 24, 2025

Summary

Polymer coating density, chain length, and core material significantly impact nanodiamond (ND) behavior in biological fluids. These factors are crucial for optimizing nanodiamonds (NDs) for nanomedicine applications.

Keywords:

PEGylation molecular dynamics nanodiamonds nanomedicine nanoparticles protein corona titanium dioxide

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Area of Science:

Nanomedicine
Materials Science
Computational Chemistry

Background:

Nanodiamonds (NDs) are promising for nanomedicine due to their unique properties.
Poly(ethylene glycol) (PEG) coating enhances ND biocompatibility and circulation time by reducing protein adsorption.

Purpose of the Study:

To investigate the impact of PEGylation parameters on nanodiamonds (NDs) and titanium dioxide (TiO2) nanoparticles (NPs) in physiological environments.
To identify key factors for optimizing polymer-coated nanoparticles for nanomedical applications.

Main Methods:

Atomistic molecular dynamics (MD) simulations of PEGylated spherical ND and TiO2 models.
Evaluation of PEG terminal group, length, grafting density, and core dimension effects.
Analysis of nanoconjugate structural properties and interactions with the aqueous phase.

Main Results:

PEG grafting density, PEG chain length, and core material are critical for nanodiamond (ND) system dynamics.
PEG terminal group and ND core dimension have minor effects on PEGylated nanosystems.
PEG coating effectively prevents nanodiamond (ND) aggregation.

Conclusions:

Strategic adjustment of PEGylation parameters can optimize nanodiamond (ND) performance for clinical applications.
Computational insights support the rational design of polymer-coated inorganic nanoparticles for nanomedicine.
This study provides valuable guidance for experimental nanomedicine research.