**4. Conclusions**

This paper has examined the effect of TiO2 photocatalyst on *E. coli* in terms of antibacterial activity by carrying out two different tests (a drop deposited on a photocatalytic substrate and a stirring experiment in a TiO2-bearing suspension).

Some general effects reported in the literature concerning the photocatalytic disinfection process have been observed.


In addition, the transparent coatings tested showed significant antibacterial activities under low UV irradiation. The results suggest that improving the formulation, *i.e.*, varying the proportions of the components, could increase the efficiency of coatings. In a broader framework, further experimental investigations will be conducted on the resistance of this coating to fungal proliferation and on the protection it affords against the formation of microbial biofilms.
