Poly(Sarcosine)-Based Nano-Objects with Multi-Protease Resistance by Aqueous Photoinitiated Polymerization-Induced Self-Assembly (Photo-PISA)

Spyridon Varlas, Panagiotis G Georgiou, Panayiotis Bilalis, Joseph R Jones, Nikos Hadjichristidis, Rachel K O'Reilly

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
161 Downloads (Pure)


Poly(sarcosine) (PSar) is a hydrophilic poly(peptoid) with numerous biologically relevant properties, making it an appealing candidate for the development of amphiphilic block copolymer nanostructures. In this work, the fabrication of poly(sarcosine)-based diblock copolymer nano-objects with various morphologies via aqueous reversible addition-fragmentation chain-transfer (RAFT)-mediated photoinitiated polymerization-induced self-assembly (photo-PISA) is reported. Poly(sarcosine) was first synthesized via ring-opening polymerization (ROP) of sarcosine N-carboxyanhydride, using high-vacuum techniques. A small molecule chain transfer agent (CTA) was then coupled to the active ω-amino chain end of the telechelic polymer for the synthesis of a poly(sarcosine)-based macro-CTA. Controlled chain-extensions of a commercially available water-miscible methacrylate monomer (2-hydroxypropyl methacrylate) were achieved via photo-PISA under mild reaction conditions, using PSar macro-CTA. Upon varying the degree of polymerization and concentration of the core-forming monomer, morphologies evolving from spherical micelles to worm-like micelles and vesicles were accessed, as determined by dynamic light scattering and transmission electron microscopy, resulting in the construction of a detailed phase diagram. The resistance of both colloidally stable empty vesicles and enzyme-loaded nanoreactors against degradation by a series of proteases was finally assessed. Overall, our findings underline the potential of poly(sarcosine) as an alternative corona-forming polymer to poly(ethylene glycol)-based analogues of PISA assemblies for use in various pharmaceutical and biomedical applications.

Original languageEnglish
Early online date23 Oct 2018
Publication statusE-pub ahead of print - 23 Oct 2018


  • polymerization-induced self-assembly (PISA)
  • ring-opening polymerization (ROP)
  • reversible addition-fragmentation chain-transfer (RAFT) polymerization
  • photoinitiated polymerization
  • poly(sarcosine)
  • protease resistance


Dive into the research topics of 'Poly(Sarcosine)-Based Nano-Objects with Multi-Protease Resistance by Aqueous Photoinitiated Polymerization-Induced Self-Assembly (Photo-PISA)'. Together they form a unique fingerprint.

Cite this