whereas in general the three chitosans led only to a minor reduction of the initial population—not above 3 log cycles by 4 h. At the lowest concentration,
0.10% (w/v), only the o3 kDa COS mixture showed bactericidal
effect, although such an effect was rather similar to that of its
o5 kDa COS counterpart. The medium and high MW chitosans
exhibited only a 2 log cycle reduction, but their low MW
counterpart showed a slightly stronger effect. At 105 CFU/mL
inoculum level, a solution of 0.50% (w/v) COS/chitosans