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 3 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