Journal
BIOMACROMOLECULES
Volume 18, Issue 3, Pages 951-964Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.biomac.6b01824
Keywords
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Funding
- National Science Foundation [CHE 0955820, CHE 1609447, DMR-1508249]
- Louisiana State University
- U.S. Department of Energy under EPSCoR [DE-SC0012432]
- Louisiana Board of Regents
- National Institute of Standards and Technology (NIST)
- U.S. Department of Commerce
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1609447] Funding Source: National Science Foundation
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Well-defined polypeptoids bearing oligomeric ethylene glycol side chains (PNMe(OEt)(n)G, n = 1-3) with a controlled molecular weight (3.26-28.6 kg/mol) and narrow molecular weight distribution (polydispersity index, PDI = 1.03-1.10) have been synthesized by ring opening polymerization of the corresponding N-carboxyanhydrides having oligomeric ethylene glycol side chains (Me(OEt)(n)-NCA, n - 13) using primary amine initiators. Kinetic studies of polymerization revealed a first-order dependence on the monomer concentration, consistent with living polymerization. The obtained PEGylated polypeptoids are highly hydrophilic with good water solubility (>200 mg/mL) and are amorphous, with a glass transition temperature in the -41.1 to +46.4 degrees C range that increases with increasing molecular weight and decreasing side chain length. DLS and SANS analyses revealed no appreciable adsorption of lysozyme to PNMeOEtG. PNMeOEtG having different molecular weights exhibited minimal cytotoxicity toward HEp2 cells. These combined results suggest the potential use of PEGylated polypeptoids as protein-resistant materials in biomedical and biotechnological fields.
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