The Production of Polysarcosine-Containing Nanoparticles by Ring-Opening Polymerization-Induced Self-Assembly

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• N-carboxyanhydride ring-opening polymerization-induced self-assembly (NCA ROPISA) is a single-step method for nanoparticle synthesis.
• Poly(ethylene glycol) (PEG) is commonly used as a hydrophilic block but can elicit immune responses.
• There is a need for biodegradable, water-soluble polymers as alternatives to PEG.

Purpose of the Study:

• To synthesize wholly poly(amino acid)-based nanoparticles using aqueous NCA ROPISA.
• To explore alternative hydrophilic blocks to replace non-biodegradable PEG.
• To investigate nanoparticle morphology and formation mechanisms.

Main Methods:

• Chain-extension of a polysarcosine macroinitiator with L-Phenylalanine-NCA (L-Phe-NCA) and Alanine-NCA (Ala-NCA).
• Utilizing aqueous NCA ROPISA for nanoparticle formation.
• Characterizing nanoparticle morphology and structure.

Main Results:

• Successfully synthesized wholly poly(amino acid)-based nanoparticles.
• The nanoparticles formed were predominantly anisotropic and rod-like.
• Nanoparticle morphology was significantly influenced by the secondary structure of the hydrophobic poly(amino acid).

Conclusions:

• Aqueous NCA ROPISA enables the creation of fully biodegradable, poly(amino acid)-based nanoparticles.
• This method offers a promising alternative to PEG-stabilized nanoparticles, potentially reducing immunogenicity.
• The self-assembly process is controllable via the choice of poly(amino acid) secondary structure.