fa خاصیت ضد میکروبی نانو کامپوزیت کیتوزان-TiO2و به کارگیری آن روی گاز استریل بیمارستانی تحقيقي Original Paper Abstract Background and objectives: In this research, the formation of chitosan-TiO2 nanocomposite and its antibacterial effect on Escherichia coli and staphylococcus aureus was investigated Material and Methods: to study the results, we used Scanning electron microscopy (SEM) and transition electron microscopy (TEM) images, infrared (IR) spectroscopy and ultraviolet-visible. Optical Density (OD) was also measured by spectrophotometer then the effect of this nano composite, in the vicinity of aforementioned bacteria, on the sterilized gauze in solid Muller Hinton Agar and TSB liquid mediums was assessed Results: The mentioned nanocomposite was formed with the composition of 4mg/ml Chitosan concentration and 2% titanium dioxide concentration. Finally, we observed that this nanocomposite near 100% could prevent bacterial growth and in the presence of this material did not grow any bacteria. Conclusion: chitosan-Tio2 Nanocomposite can be useful on culture medium and sterilized gauze to control pathologic bacteria. Key words: nanocomposite, nanochitosan, titanium dioxide, antibacterial, sterilized gauze nanocomposite, nanochitosan, titanium dioxide, antibacterial, sterilized gauze 59 72 http://mlj.goums.ac.ir/browse.php?a_code=A-10-1-116&slc_lang=fa&sid=1 Saadatmand M M (MSc) محمدمهدی سعادتمند 100319475328460013493 100319475328460013493 No Yazdanshenas M E (PhD) محمداسماعیل یزدانشناس 100319475328460013494 100319475328460013494 No دانشکده نساجی، Rezaei-Zarchi S (PhD) سعیدرضایی زارچی 100319475328460013495 100319475328460013495 No گروه زیست شناسی Yousefi-telori B (BSc) بتول یوسفی تلوری 100319475328460013496 100319475328460013496 No faculty of advanced Medical Technology دانشکده فن آوری های نوین پزشکی Negahdary M (MSc) مسعود نگهداری masoud.negahdary@hotmail.com 100319475328460013497 100319475328460013497 Yes ، گروه زیست شناسی