Improving the cell affinity of a poly(D, L-lactide) film modified by grafting collagen via a plasma technique

Poly( D,L-lactide) films were surface-modified by grafting collagen via NH3 plasma to improve cell affinity. The modified films were characterized by IR analysis, contact angle measurement, SEM analysis and collagen quantity determination. It was demonstrated that -NH2 and collagen were incorporated into the surface of PDLLA films. The hydrophilicity of the PDLLA film increased after NH3 plasma treatment, but decreased with further collagen modification. More collagen was incorporated into the PDLLA films by a grating method as compared to that with an anchorage treatment. L929 fibroblast cells were used to evaluate the cell affinity of the modified films and control. It was shown that PDLLA films surface-modified by grafting collagen via NH3 plasma more efficiently enhanced the cells attachment and proliferation than those films modified by collagen anchorage or only NH3 plasma treatment.