Biodegradation of Poly(2-hydroxyethyl methacrylate) (PHEMA) and Poly{(2-hydroxyethyl methacrylate)-co-[poly(ethylene glycol) methyl ether methacrylate]} Hydrogels Containing Peptide-Based Cross

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• 作者：Ylenia S. Casadio ; David H. Brown ; Traian V. Chirila ; Heinz-Bernhard Kraatz ; Murray V. Baker
• 刊名：Biomacromolecules
• 出版年：2010
• 出版时间：November 8, 2010
• 年：2010
• 卷：11
• 期：11
• 页码：2949-2959
• 全文大小：616K
• 年卷期：v.11,no.11(November 8, 2010)
• ISSN：1526-4602

文摘

PHEMA−peptide and P[HEMA-co-(MeO-PEGMA)]−peptide conjugate hydrogels [where PHEMA = poly(2-hydroxyethyl methacrylate; PEGMA = poly(ethylene glycol) methacrylate] were readily prepared via photoinitiated free-radical polymerization in water. The PHEMA−peptide hydrogels were opaque and had a heterogeneous morphology of interconnected polymer droplets, characteristic of polymers that separate from the aqueous phase during the polymerization experiment. The P[HEMA-co-(MeO-PEGMA)]−peptide conjugates were transparent gels with a homogeneous morphology when formed in water, but when formed in aqueous NaCl solutions the P[HEMA-co-(MeO-PEGMA)]−peptide conjugates were also opaque and exhibited the heterogeneous morphology of interconnected polymer droplets. When incubated in solutions containing activated papain, P[HEMA-co-(MeO-PEGMA)]−peptide conjugates underwent degradation that was characterized by macroscopic changes to sample shape and size, sample weight, and microscopic structure. PHEMA−peptide conjugates did not undergo any significant degradation when incubated with papain, although ninhydrin-staining experiments suggested that some peptide cross-linker groups were cleaved during the incubation. The difference in degradation behavior of PHEMA−peptide and P[HEMA-co-(MeO-PEGMA)]−peptide conjugates is attributed to differences in aqueous solubility of PHEMA and P[HEMA-co-(MeO-PEGMA)].