Paraffin spheres as porogen to fabricate poly(L‐lactic acid) scaffolds with improved cytocompatibility for cartilage tissue engineering
Tóm tắt
Three‐dimensional poly(L‐lactic acid) (PLLA) scaffolds with high porosity and pore size ranging from 150 to 700 μm were conveniently prepared with paraffin spheres used as porogen. PLLA/1,4‐dioxane solution containing a given amount of paraffin spheres was frozen at −25 °C to obtain a solidified mixture, followed with freeze drying and subsequent leaching with hexane to remove the 1,4‐dioxane and paraffin spheres, respectively. The fabricated PLLA scaffolds were highly porous with evenly distributed and interconnected pores. The microstructures of the PLLA scaffolds as a function of paraffin‐sphere size, paraffin‐sphere dosage, and PLLA concentration were characterized by confocal laser scanning microscopy (CLSM) and scanning‐electronic microscopy (SEM). To improve the cytocompatibility of the bioinert material, a hybrid PLLA scaffold containing Type I collagen was prepared by pressing the collagen solution into the scaffold under reduced pressure. The amounts of the collagen introduced in the scaffolds were detected by ninhydrin method. The distribution of the collagen in the scaffolds was studied with CLSM. Finally,
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Tài liệu tham khảo
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