exhibit similar antibacterial activity. A control experiment in
which an acidic solution was used as a medium verified that
the acid itself killed the bacteria. Therefore, we used growth
medium in order to dissolve and analyze the sample’s
antibacterial activity, although the powder was not completely
dissolved. As can be seen in Table 1, chitosan reduced the
number of viable E. coli cells by an average of 6.5 log CFU.
PEGylated chitosan prepared from the same chitosan reduced
the number of E. coli viable cells by 7 log CFU in all replications,
indicating that this material has higher antibactericidal
activity