after overnight incubation with chitosan showed, that bacteria areable to grow on them (Table 1). In contrast, chitosan saturatedwith oxygen demonstrated pronounced antibacterial properties(Fig. 5). When oxygen saturation was performed by anodic treat-ment, the number of E. coli cells (CFU) following the overnightincubation with such chitosan was about 100-fold lower comparingto that with untreated chitosan. In the case of direct oxygen satura-tion, the antibacterial properties of chitosan were much distinctlyexpressed. The amount of viable E. coli cells was about 3000-foldlower than that in control samples (Fig. 4). Obviously, the suppres-sive activity of chitosan against the growth of E. coli is stronglyinfluenced by its possibility to adsorb the dissolved oxygen.