Viscosity average Mw was determined as follows:
chitosan or chitosan oligomer was dissolved in 0.1 M
acetic acid – 0.2 M NaCl and Automated Solution
Viscometer (Relative Viscometer Model Y501, Viscotek,
Houston, TX, USA) was used to measure the
intrinsic viscosity [g]. The Mark –Houwink equation
[g] = KMwa was used to calculate the molecular
weight. The value of K and a of 1.81 10 3 cm3
/g
and 0.93, respectively were used.