Fig. 8.

Influence of degree of substitution on MG-63 cell attachment on cationic cellulose films after 1 h incubation at 37 °C in 5% CO₂, n = 3 and error bars show standard error. Films were immersed for 24 h in DMEM medium, prior to seeding. Only a minimal level of modification with GTMAC was required for significant enhancement of cell attachment on cationic cellulose surface versus unmodified cellulose. Values significantly different from unmodified cellulose films were indicated by the confidence values *p < 0.05, **p < 0.01 and ***p < 0.001