نوع مقاله : مقاله پژوهشی
نویسندگان
1 کارشناسی‌ارشد، گروه میکروبیولوژی، دانشکده علوم پایه، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران
2 استادیار، گروه میکروبیولوژی، دانشکده علوم پایه، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران
چکیده
زمینه و هدف: استافیلوکوکوس اپیدرمیدیس از پاتوژن‌های فرصت‌طلب است که اخیراً از مهم‌ترین عوامل ایجاد عفونتهای بیمارستانی است. شیوع این دسته از عفونتها در کنار افزایش گونه‌های مقاوم به آنتی‌بیوتیک به یک معضل نگران‌کننده مبدل شده است. استفاده از نانوذرات برای مقابله با عفونتهای باکتریایی می‌تواند جایگزین آنتی‌بیوتیک‌ها باشد. در این تحقیق خواص ضدباکتریایی نانوذرات نقره داپ شده بر نانوکریستال اکسیدآهن بر باکتری استافیلوکوک اپیدرمیدیس جداشده از عفونتهای بیمارستانی بررسی گردید.
مواد و روش‌ها: ابتدا نانوذرات به روش هم‌رسوبی شیمیایی ساخته شدند، سپس برای بررسی خاصیت باکتری‌کشی، غلظت‌های 0، 20، 40، 60،80 و100 ppm تهیه گردید و تأثیر نانوذرات بر باکتری‌های ایزوله و استاندارد استافیلوکوکوس اپیدرمیدیس در زمانهای 24، 48 و72 ساعت به روش میکروپلیت تیتر مطالعه شد و سپس دادهها با نرم‌افزار SPSS-18 در سطح خطای 0/01 بررسی گردید.
یافتهها: نتایج نشان داد متغیرهای زمان، نوع باکتری و غلظت، تأثیر معنی‌دار بر مهار رشد باکتری استافیلوکوکوس اپیدرمیدیس دارند که غلظت و نوع باکتری تأثیرات به‌مراتب بیشتری از خود نشان دادند. بیشترین تأثیر ضدباکتری نانوذرات نقره داپ شده با نانوکریستال آهن مربوط به غلظت 100ppm در زمان‌ماند 48 ساعت بر باکتری استاندارد بود.
نتیجهگیری: نانوذرات نقره داپ شده با نانوکریستال آهن بر رشد باکتری استافیلوکوکوس اپیدرمیدیس مؤثرند و باعث کاهش رشد آن می‌شوند. این اثرگذاری نسبت به تأثیر نانوذرات نقره در حالت منفرد که قبلاً موردبررسی محققان قرار گرفته است بیشتر می‌باشد و ترکیب نانوذرات فلزی باهم باعث بهبود اثربخشی آنها شد.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Evaluating Anti-Bacterial Effect of Doped Silver Nanoparticles on Iron Oxide Nanocrystal in Staphylococcus Epidermidis Isolated from Nosocomial Infection
نویسندگان [English]
- Hanieh Bayat 1
- Reza Habibipour 2
- Narges Ghobadi 2
- Fatemeh Golipour 1
1 M.Sc, Department of Microbiology,Faculty of Basic Sciences,Hamedan Branch,Islamic Azad University, Hamedan, Iran
2 Assistant Professor, Department of Microbiology, Faculty of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
چکیده [English]
Introduction: Staphylococcus epidermidis is an opportunistic pathogen and of the most important cause of infectious diseases. The prevalence of these infections, as well as the increase of antibiotic-resistant species, has become a solicitous issue. Using nanoparticles to combat bacterial infections can replace antibiotics. In this study, the antibacterial properties of doped silver nanoparticles on Iron oxide nanocrystal on isolated Staphylococcus epidermidis bacteria from nosocomial infection was studied.
Materials and Methods: Firstly, Nanoparticles were prepared by chemical co-precipitation method and were prepared at concentrations of 0, 20, 40, 60, 80 and 100 ppm to determine bactericidal properties. The effect of nanoparticles on isolated and standard strains of Staphylococcus epidermidis at 24, 48 and 72 hours were investigated by microplate titer. Data were analyzed by SPSS -18 software at a 0.01 margin of error.
Results: The results showed that time, bacterial type and concentration factors had a significant effect on the growth inhibition of Staphylococcus epidermidis, though the concentration and type of bacterial variables had more significant effects. The most antibacterial effect of doped silver nanoparticles on iron oxide nanocrystals was at 100ppm concentration over a 48-hour time on standard isolate.
Conclusion: Doped Silver nanoparticles on Iron nanocrystals affect the growth of Staphylococcus epidermidis and reduce its growth rate. This effect, in comparison to the effects of silver nanoparticles in a single state, which has already been investigated by researchers, is far more advanced and the combination of Metal nanoparticles together cause to improve their effectiveness.
کلیدواژه‌ها [English]
- Silver Nanoparticles
- Iron Nanocrystals
- Staphylococcus epidermidis
- Nosocomial Infection
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