*3.6. Antibacterial Activity of Cotton Fabric*

Various methods have been proposed for the antimicrobial modification of material surfaces as an alternative way of preventing the formation of highly resistant biofilms [37]. The antimicrobial activity of cotton fabrics treated with the compounds has been investigated by reduction of the growth of Gram (+) *B. cereus* and Gram (−) *P. aeruginosa* used as model strains. The results demonstrate good antimicrobial effect of both ACR and [Cu2(ACR)(NO3)2] treated cotton fabrics (Figure 5). They are highly effective inhibiting about 90% of the growth of *B. cereus* and more than 50% of the growth of *P. aeruginosa*. Slow diffusion of the compounds from the cotton fabric into the medium and the direct contact with bacterial cells may contribute to the antimicrobial effect of the modified cotton fabrics.
