Rheological and Biological Characteristics of Hyaluronic Acid Derivative Modified by Polyethylene Glycol

Hyaluronic acid (HA) was chemically modified by polyethylene glycol. Meanwhile, the dynamic mechanics properties of HA derivative and its viscoelastic changes were measured on 3ARES3 Rheometer (Japan) at 25 degrees C. Dried cross-linked films of 10 X 10 mm(2) were immersed in phosphate buffered saline(PBS: pH 7.4) at 37 degrees C with different time periods to measure its water content and in vitro degradation. Moreover, cell cultured solutions, which were in the different cultivation vesse with 1 mg/mL Solution of HA derivative as doing experimental sample for 2 d, 4 d and 7 d, were observed, respectively, by an inverted discrepancy microscope. The cell relative growth rate was analyzed with the SPSS10.0 mathematic statistic software. Based on the above experiments, structure-modified HA derivative can meet the requirements of biomaterials in view of theological and degradation in vitro and cytotoxicity charactereistics from clinical medical aspect under this experiment conditions.