Antibiotic activity of chitosan
The antibacterial activity of ceftazidime against P.aeruginosawas found to be weak with MICs of 1021 µg/ml. However, when combined with chitosan, ceftazidime exhibited strong antibacterial activity. The MICs of ceftazidime decreased to 65 µg/ml. Similar results were obtained using the agar diffusion method, with inhibition zones reaching 25 mm at 64 µg/ml (Table 5).