PEGs for mRNA Delivery

Lipid Nanoparticles (LNPs) are delivery systems commonly employed in the field of nucleic acid drugs. LNPs are generally believed to combine with the cell membrane through non-covalent affinity and absorbed by endocytosis. After being absorbed by the cell, the mRNA delivered by LNPs are released to the cytoplasm and express the target protein, escaping from the endocytosis. PEGs for RNA DeliveryThe LNP technology has been adopted for COVID-19 vaccine manufacture1. JenKem Technology provides large scale GMP manufacture of PEG derivatives for LNPs, and related PEG intermediates.

Example PEGs for LNPs:
M-DMG-2000 (Methoxy PEG Dimyristoyl-rac-glycerol, MW 2000)
M-DTDA-2000 (Methoxy PEG Ditetradecylamino, MW 2000)

PEGs for siRNA Delivery

A novel siRNA delivery system, consisting of CPP (cell penetrating peptide) such as LMWP, linked to a PEG, has been developed by JenKem Technology. siRNAs, while potentially very useful as drugs, are easily degraded by nucleases in vivo, and their relatively high molecular weight, negative charge and hydrophilicity inhibit their ability to permeate through cell membranes. Adding a PEG to CPP improves the siRNA drug’s bioavailability2 by preventing the self-assembly and formation of intra-molecular hairpin structures between CPP and siRNA.

Example CPP PEGs:

Please contact us for a quotation.

Founded in 2001 by experts in PEG synthesis and PEGylation, JenKem Technology specializes exclusively in the development and manufacturing of high quality polyethylene glycol (PEG) products and derivatives, and related custom synthesis and PEGylation services. JenKem Technology is ISO 9001 and ISO 13485 certified, and adheres to ICH Q7 guidelines for GMP manufacture. The production of JenKem® PEGs is back-integrated to in-house polymerization from ethylene oxide, enabling facile traceability for regulated customers. JenKem Technology caters to the PEGylation needs of the pharmaceutical, biotechnology, medical device and diagnostics, and emerging chemical specialty markets, from laboratory scale through large commercial scale.


  1. Schoenmaker, Linde, et al., mRNA-lipid nanoparticle COVID-19 vaccines: structure and stability, International Journal of Pharmaceutics 601 (2021).
  2. Ye, J., et al., High-Yield Synthesis of Monomeric LMWP(CPP)-siRNA Covalent Conjugate for Effective Cytosolic Delivery of siRNA, Theranostics (2017).