Biocompatible Single-Chain Polymeric Nanoparticles via Organo-Catalyzed Ring-Opening Polymerization

Area of Science:

• Polymer Chemistry
• Nanotechnology
• Biomaterials Science

Background:

• Single-chain polymeric nanoparticles (SCPN) offer unique properties for advanced applications.
• Developing efficient and mild synthesis methods for well-defined SCPN is crucial.
• Existing methods may involve harsh conditions or lack precise control over nanoparticle characteristics.

Purpose of the Study:

• To present a novel organo-catalyzed ring-opening polymerization (ROP) approach for synthesizing biocompatible SCPN.
• To demonstrate the ability to control SCPN size and confirm their structure and properties.
• To evaluate the cytotoxicity of the synthesized SCPN for potential biomedical applications.

Main Methods:

• Synthesis of linear polymeric precursors with pendent caprolactone groups via reversible addition-fragmentation chain transfer (RAFT) polymerization.
• Intramolecular cross-linking of precursors using organo-catalyzed ROP with benzyl alcohol and methanesulfonic acid.
• Characterization of SCPN using Gel Permeation Chromatography (GPC), Dynamic Light Scattering (DLS), 1H Nuclear Magnetic Resonance (NMR), and Atomic Force Microscopy (AFM).

Main Results:

• Discrete, well-defined SCPN were successfully synthesized under mild reaction conditions.
• SCPN size was tunable, ranging from 2-5 nm, dependent on the parent linear macromolecule's molecular weight.
• Cytotoxicity studies confirmed that the biodegradable polyester-cross-linked SCPN were non-toxic to human embryonic kidney (HEK293T) cells.

Conclusions:

• The study successfully demonstrated an efficient and versatile method for generating uniformly sized, tunable soft nanoparticles.
• The synthesized SCPN possess biocompatible and non-toxic properties, making them suitable for various applications.
• These novel SCPN hold significant potential for applications in drug delivery systems and gas separation membranes.