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GMP grade PEG lipids for Nucleic Acid Delivery

Polyethylene glycol (PEG) lipids have traditionally been the polymer lipid conjugate of choice for lipid nanoparticle (LNP) formulations.

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PEG lipids

PEG lipids are found in the exterior shell of the LNP and serve a couple of key functions including:1 providing steric hindrance to prevent aggregation and 2 promoting a small particle size. PEG-lipids are also used to prevent proteins from binding to LNPs and increase systemic circulation times and mediate indirect targeting capabilities of LNPs. The ability of LNPs formulated with PEG-lipids to bypass the reticulo-endothelial clearance system and stay in systemic circulation gives them their nickname - “stealth agents”.

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While PEG-lipids have long been the standard for LNP formulations, they also present a few challenges including: 

  • Steric hindrance of long PEG chains hinders the ability of a cell to uptake the therapeutic
  • PEGylation also hinders endosomal escape of nanoparticles, leading to decreased activity of the delivery system
  • Repeated administration of PEGylated systems can result in a phenomenon called accelerated blood clearance (ABC).
Other alternatives to PEG-lipids in LNPs are being explored, and recent work has identified polysarcosine (pSar)-lipids as a promising alternative. pSar-lipids, a polymer-lipid conjugate based on the amino acid sarcosine, have demonstrated similar stealth properties to PEG-lipids. Previous studies have also shown polysarcosine lipids to induce a lower immunogenic response than PEG-lipids when administered to rabbits, zebrafish embryos, and mice. And most recently, pSar-lipids were evaluated in mRNA-LNPs and displayed high RNA transfection ability and an improved safety profile. Avanti is now offering pSar-lipids with varying polymeric chain lengths and lipid chain lengths for your PEG-free mRNA delivery research! Discover polysarcosine lipids as an alternative to PEG-lipids today!

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Why partner with us?

Support from concept to commercial

It starts with having the leading lipid technology experts in synthesis and formulation and approaching the discovery process in a collaborative nature, then having the expertise to transfer those learnings into a GMP manufacturing environment to support clinical development. And finally, having the commercial production capability to support launch and commercial supply.

Our full range of services include process chemistry, scale-up manufacturing, supply chain management with analytical and regulatory requirements. Our experienced staff of chemists and lipid analysts are ready to meet your development needs with pre-clinical through phase III and commercial launch, speak to one of our experts today!

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Lipid supporting services

CDMO cGMP manufacturing

CDMO project management from R&D through to commercialization. Contract manufacturing of proprietary lipid products.

Custom synthesis

Synthesis of research use materials for a variety of applications. Custom synthesis of reference standards or impurities.


Development of a suitable formulation for lipid-based delivery systems. Custom lipid blends for use in delivery or diagnostic applications.

1. Hald Albertsen C, Kulkarni JA, Witzigmann D, Lind M, Petersson K, Simonsen JB. The role of lipid components in lipid nanoparticles for vaccines and gene therapy.

2. Adv Drug Deliv Rev. 2022 Sep;188:114416. doi: 10.1016/j.addr.2022.114416. Epub 2022 Jul 3.