Biocatalytic synthesis of highly ordered degradable dextran-based hydrogels

• Autor(es): Ferreira, Lino ; Gil, Maria H. ; Cabrita, António M. S. ; Dordick, Jonathan S.
• Data: 2005
• Identificador Persistente: http://hdl.handle.net/10316/3799
• Origem: Estudo Geral - Universidade de Coimbra
• Assunto(s): Dextran; Hydrogel; Cross-linking; Biodegradation
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

We have prepared unique macroporous and ordered dextran-based hydrogels using a single-step biocatalytic transesterification reaction between dextran and divinyladipate in neat dimethylsulfoxide. These hydrogels show a unimodal distribution of interconnected pores with average diameters from 0.4 to 2.0 [mu]m depending on the degree of substitution. In addition, the hydrogels show a higher elastic modulus for a given swelling ratio than chemically synthesized dextran-based hydrogels. In vivo studies in rats show that the hydrogel networks are degradable over a range of time scales from 5 to over 40 days, and possess good biocompatibility, as reflected in only a mild inflammatory reaction and minor fibrous capsule formation during the time-frame of subcutaneous implantation. These combined properties may offer competitive advantages in biomedical applications ranging from tissue engineering to controlled drug delivery. http://www.sciencedirect.com/science/article/B6TWB-4F7Y94V-3/1/0d83788c215a34850e13d6d76d3bba82