Concentrations of nHA Time 24 hours 48 hours 72 hours

5

0.299 ± 0.005 0.295 ± 0.009 0.259 ± 0.007

10

0.306 ± 0.01 0.300 ± 0.005 0.267 ± 0.006

20

0.309 ± 0.002 0.297 ± 0.003 0.262 ± 0.002

30

0.298 ± 0.009 0.299 ± 0.009 0.256 ± 0.002

40

0.304 ± 0.004 0.295 ± 0.007 0.238 ± 0.002

50

0.308 ± 0.009 0.295 ± 0.005 0.236 ± 0.004
Table 1: Mean and standard deviations of vitality of L929 fibroblast cells after exposure to different concentrations of nHA at 24, 48 and 72 hrs.