6533b822fe1ef96bd127d995

RESEARCH PRODUCT

Hyperbranched Polyglycerol-Based Lipids via Oxyanionic Polymerization: Toward Multifunctional Stealth Liposomes

Anna Maria HofmannFrederik R. WurmThomas NawrothEva HühnPeter LangguthHolger Frey

subject

AnionsGlycerolLiposomeMagnetic Resonance SpectroscopyPolymers and PlasticsEthylene oxidePolymerstechnology industry and agricultureBioengineeringLipidsSmall-angle neutron scatteringBiomaterialschemistry.chemical_compoundEnd-groupAnionic addition polymerizationchemistryDynamic light scatteringPolymerizationSpectrometry Mass Matrix-Assisted Laser Desorption-IonizationLiposomesSpectroscopy Fourier Transform InfraredPolymer chemistryMaterials Chemistrylipids (amino acids peptides and proteins)Ethylene glycol

description

We describe the synthesis of linear-hyperbranched lipids for liposome preparation based on linear poly(ethylene glycol) (PEG) and hyperbranched polyglycerol (PG). Molecular weights were adjusted to values around 3000 g/mol with varying degrees of polymerization of the linear and the branched segments in analogy to PEG-based stealth lipids; polydispersities were generally low and below 1.3. The hydrophobic anchors were introduced into the lipid structures as initiators for the anionic polymerization of ethylene oxide and are either based on cholesterol or on different aliphatic glyceryl ethers. Complete incorporation of the apolar initiators was evidenced by MALDI-ToF analysis at all stages of the reaction. The linear-hyperbranched polyether lipid is incorporated as the polyfunctional shell in liposome formulations together with 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC). The resulting liposomes were subsequently characterized via dynamic light scattering (DLS) and small angle neutron scattering (SANS) as well as transmission electron microscopy (TEM), demonstrating the formation of unilamellar liposomes in the size range of 40 to 50 nm.

yearjournalcountryeditionlanguage
2010-02-04Biomacromolecules
https://doi.org/10.1021/bm901123j