Bacterial killing efficacy of light, photocatalysts and some chemical antimicrobials

الملخص EN

The study was planned to determine the role of light and antimicrobial chemicals on bacterial growth .

Bacterial cultures were exposed separately to ultraviolet type C ( UVC : 254 nm) alone for 5, 10 and 15 minutes, the exposure operations give rise to various reduction rates in bacterial counts.

Treatment of bacterial cultures with titanium dioxide TIO2, and some other chemical antimicrobials separately improved significant degree of bacterial reduction .

The combination uses of light source and chemical antimicrobials have shown a highly rate of bacterial reduction.

The killing efficacy of uv alone and uv combination with antimicrobials were varies with exposure time and concentration of antimicrobials .

Gram- positive bacteria have shown more sensitivity to these agents than gram- negative bacteria., Staphylococcus aureus reveals highly mortality rates to all antimicrobial agents than other types of bacteria..