Biomimetic Nanofibrous Scaffolds:Preparation and Characterization of PGA/Chitin Blend Nanofibers

摘要

Electrospinning of poly(glycolic acid) (PGA)/chitin blend solutions in 1,1,1,3,3,3-hexafluoro-2-propanol was investigated to fabricate biodegradable and biomimetic nanostructured scaffolds for tissue engineering.The morphology of the electrospun PGA/chitin blend nanofibers was investigated with a field emission scanning electron microscope.The PGA/chitin blend fibers have average diameters of around 140 nm,and their diameters have a distribution in the range 50-350 nm.The miscibility of PGA/chitin blend fibers was examined by differential scanning calorimetry.The PGA and chitin were immiscible in the as-spun nanofibrous structure.An in vitro degradation study of PGA/chitin blend nanofibers was conducted in phosphate-buffered saline,pH 7.2.It was found that the hydrolytic cleavage of PGA in the blend nanofibers was accelerated by the coexistence of hydrophilic chitin.To assay the cytocompatibility and cell behavior on the PGA/chitin blend nanofibrous scaffolds,cell attachment and spreading of normal human epidermal fibroblasts seeded on the scaffolds were studied.Our results indicate that the PGA/chitin blend nanofibrous matrix,particularly the one that contained 25% PGA and 75% chitin with bovine serum albumin coating,could be a good candidate for tissue engineering scaffolds,because it has an excellent cell attachment and spreading for normal human fibroblasts.