who reported that
antibacterial activity increase in the order of chitin deacetylation
degree. This inhibition is more important against Gram-negative
than Gram-positive bacteria tested. Gram-negative bacteria, with
lipopolysaccharide at the outer surface providing negative charges,
seemed to be very sensitive to chitosan while the sensitivity of
Gram-positive bacteria that can have variable amounts of negatively
charged teichoic acids at their outer surface varied greatly