2.7. Cells culture and analysis
Cell proliferation on the surface of blending membranes was assessed by colorimetric assay, which detected the conversion
of 3-(4,5-dimethylthiazol-2yl)-2,5-diphenyltetrazolium bromide(MTT, Sigma) to formazan. Briefly, 1 cm×1 cm test samples made from the membranes were sterilized by ethylene oxide vapor and immersed in RPMI 1640 medium with 10% FBS for 24 h (n = 3).