Figure 2.
GPC analysis of MMP-sensitive PEG-diacrylates plotted against PEG MW standards. Highly degradable (“HD”) peptide reacted with a 2.2 molar excess of PEGDA (uppermost curve) via step-growth polymerization resulted in more than 80% conjugation (sum of Medium and High MWs). Reaction of MMP-sensitive peptides with a 1.6 molar excess of PEGDA (remaining three curves) resulted in more than 90% conjugation, with a majority of the molecular weight species greater than 500 kDa. When subjected to the same reaction stoichiometry, HD, collagen native (“CN”), and least degradable (“LD”) PEG-peptide conjugates show nearly identical polydispersity.