Interaction Between Endocrine Disruptors and Polyethylene Nanoplastic by Molecular Dynamics Simulations

Area of Science:

• Environmental Science
• Toxicology
• Computational Chemistry

Background:

• Nanoplastics (NPs) pose human health risks through ingestion and inhalation.
• NPs can act as vectors for environmental contaminants.
• Bisphenol A (BPA) and Benzophenone (BZP) are endocrine-disrupting chemicals linked to diseases.

Purpose of the Study:

• To investigate the potential for nanoplastics to cotransport contaminants.
• To quantify the binding affinity between polyethylene nanoplastics and BPA/BZP molecules.

Main Methods:

• Molecular dynamics simulations were employed.
• Potential of Mean Force (PMF) profiles were calculated.
• Interactions between polyethylene NPs and BPA/BZP were analyzed.

Main Results:

• Benzophenone (BZP) exhibited a significantly stronger attractive potential (-23.5 kJ mol⁻¹) to polyethylene NPs compared to Bisphenol A (BPA) (-8.0 kJ mol⁻¹).
• BPA's higher hydrogen bonding with water likely influences its interaction with NPs.
• BZP demonstrates a greater propensity for adsorption onto polyethylene NPs.

Conclusions:

• Nanoplastics may play a role in the cotransport and bioaccumulation of endocrine disruptors like BPA and BZP in aquatic ecosystems.
• The differential binding affinities highlight the varying risks associated with different contaminants.
• Further research is needed to understand the environmental significance of NP-contaminant interactions.