PEGylated "stealth" nanoparticles and liposomes

Zhiqiang Shen*, Alessandro Fisher, Wing K Liu, Ying Li

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

41 Scopus citations


Through nanomedicine, game-changing methods are emerging to deliver drug molecules directly to diseased tissue. The targeted delivery of drugs and imaging agents via drug carrier-based platforms is among the most promising of these methods. Such drug delivery systems can now be synthesized from a wide range of different materials, made in a number of different shapes, and coated with an array of different organic molecules, including ligands. In this chapter, we will focus on PEGylated liposomes and nanoparticles. By grafting polyethylene glycol (PEG) polymers on the surfaces of liposomes and other nanoparticles, protein absorption can be dramatically reduced, resulting in less macrophage cellular uptake and therefore prolonged blood circulation times in PEGylated over non-PEGylated nanomaterials. Through systematic experiments and computer simulations, the densely packed PEG polymers are found to play the most important role in this process, which is highly related to their conformation and free energy change. Such insights may provide guidance in the design of efficient drug carriers for clinical applications.

Original languageEnglish (US)
Title of host publicationEngineering of Biomaterials for Drug Delivery Systems
Subtitle of host publicationBeyond Polyethylene Glycol
PublisherElsevier Inc
Number of pages26
ISBN (Electronic)9780081017517
ISBN (Print)9780081017500
StatePublished - Jan 27 2018


  • Cellular uptake
  • Drug delivery
  • Nanomedicine
  • PEGylation
  • Protein corona

ASJC Scopus subject areas

  • General Engineering
  • General Biochemistry, Genetics and Molecular Biology


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