Chitosan is primarily
characterized by its molecular weight (MW) and the degree
of acetylation (DA). Commercially chitosan is available
with > 85% deacetylated units (DA < 15%), and molecular
weights (MW) between 100 and 1000 kDa. There is no a
specific standard to define MW, but it is accepted that Low
MW < 50 kDa, Medium MW 50 – 150 kDa, and High MW
> 150 kDa