Effects of temperature and relative humidity on biological indicators used for ethylene oxide sterilization.
نویسندگان
چکیده
A study was made to determine the effects of temperature and moisture on the D-value of a common biological indicator. Relative humidity (RH) was varied between 10 and 70% in increments of 10%, and temperature was varied between 30 and 70 degrees C in increments of 10 degrees C. Temperature was found to have a pronounced effect on the D-value. At 60% RH, the D-value varied from 15.0 min at 30 degrees C to 1.1 min at 70 degrees C. When RH was plotted against the average D-value at the various temperatures, the temperature curves at or above 50 degrees C were more erratic and the RH had a significant effect. The study showed that temperature and RH must be controlled if biological indicators are to be properly calibrated for use in ethylene oxide sterilization.
منابع مشابه
Ethylene oxide resistance of nondesiccated and desiccated spores of Bacillus subtilis var. niger hermetically sealed in various polymeric films.
The resistance to destruction of spores of Bacillus subtilis var. niger hermetically sealed in various polymeric films and exposed to ethylene oxide with and without relative humidity was determined. The effect of desiccation was also determined. The order of increased resistance to sterilization with regard to type of polymeric film was found to be: polyethylene equal to polyvinyl chloride, le...
متن کاملEffect of Moisture on Ethylene Oxide Sterilization.
Bacterial cells dehydrated beyond a critical point no longer react uniformly to ethylene oxide sterilization. The percentage of cells resistant to the lethal effect of ethylene oxide after desiccation is often as small as 0.1 to 0.001%. However, 5% resistant cells were observed with one type of microorganism dried in broth. The presence of organic matter increases the percentage of cells that b...
متن کاملThe study of humidity effect on carbon dioxide gas sensing properties of zinc oxide nanowires assisted by polyvinyl alcohol network at room temperature
In this research, Zinc oxide (ZnO) nanostructures were synthesized by low cost hydrothermal method. The grown ZnO nanostructures had a dispersed distribution with nanowire morphology and the specific surface area of about 7 m2.gr-1 which they have crystalized in hexagonal wurtzite structure. ZnO nanowires/polyvinyl alcohol network (ZP) on the epoxy glass substrate with cu-interdigited electrods...
متن کاملReaction of the sterilant, ethylene oxide, on plastics.
Ethylene oxide (ETO) in the form, "Cryoxcide,"' is used to sterilize surfaces and objects that cannot be treated with heat or corrosive chemicals. Cryoxcide is a gaseous formulation consisting of 11 per cent of ethylene oxide, 44.5 per cent of trichloromonofluoromethane (Freon 11), and 44.5 per cent of dichlorodifluoromethane (Freon 12). Cryoxcide is used at this laboratory to sterilize sensiti...
متن کاملEffects of Climate Change on Food Expenditures of Rural Households in Iran
This study examined the effects of climate change on food expenditure in rural household of Iran. Food expenditure is investigated as a function of average income of rural households, retail food price index and food expenditure for rural households, agricultural sown area and climate change. Here, the Stata11 software is used and data are from 26 provinces of the country for 10 years. Precipit...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Applied and environmental microbiology
دوره 45 2 شماره
صفحات -
تاریخ انتشار 1983