ROTI®ContiPlate VRBD
Sterile contact agar for detection of enterobacteria on surfaces.
9631
Ready-to-use and sterile
Very easy application, reliable assay and easy interpretation
Suitable for analysis of each surface e.g. walls, floors, working surfaces, palms etc.
For hygiene monitoring or education in microbiological laboratories, clinics and in the food sector
COMPOSITION (in g/l, approximated)
ROTI®ContiPlates consist of a petri dish with lid with a diameter of 6,5 cm, filled with nutrient agar.
The agar provides a contact area of 25 cm².
The domed surface of the agar is ideal for the analysis of surfaces.
The 1 cm² grid on the bottom of the plate helps interpreting the results.
The Violet Red Bile Agar with Glucose (Art. No. X939) is recommended by Pharm. Eur. and ISO 21528 for enumeration of
enterobacteria.
For further information about the agar please see the respective datasheets of the dehydrated medium.
STORAGE, EXPIRY AND SHIPMENT
ROTI®ContiPlates are shipped at room temperature. Please make sure that ROTI®ContiPlates are stored immediately
at + 15 – 25 °C and protected from light.
ROTI®ContiPlates may not be frozen. Plates that have been frozen have to be disposed of, since the medium is likely to have
taken severe damage, and growth of microorganisms is significantly hindered.
Expiry of ROTI®ContiPlates is 5 months after production. Expiry date is noted on each package and on each plate with „EXP“.
APPLICATION
1. Carefully remove the silvery foil above one plate (e.g. by pushing in gently or by cutting carefully with a knife along the edge
of the well) and remove the plate from the sterile blister. Make sure that the agar is not dried out or contaminated.
2. Remove the lid from the plate and gently press the agar for approximately 10 seconds completely onto the surface that has
to be tested. Don’t spin or shift the plate sideways. There should be no bubbles trapped between the agar and the testing
surface.
Do NOT touch the agar or the inside of the lid (risk of contamination!)
3. Close the plate with the lid. In order to avoid contamination through airborne germs, don’t leave the plate open over a longer
time and avoid intense movements.
4. Incubate the closed plate bottom up at a temperature suitable for the bacteria (e.g. 30-35 °C for 18-24 h, or 37 °C for 24 ± 2 h).
Tip: Wipe the tested surface with a disinfectant, e.g. with isopropyl alcohol in order to clear it from residues of agar.
5. After the appropriate incubation time span, count and register colonies.
Please note: In accordance with official regulations or internal protocols other incubation parameters have to be chosen.
EVALUATION OF RESULTS
After the incubation time span required, colonies are counted and noted as cfu (colony forming units).
Holding the plate in front of a light source helps spotting and counting the colonies.
Divide the number of colonies through the contact surface of the plate (25 cm²) and note the result as cfu/cm². In case of heavier
growth, count the colonies in several squares of the grid on the bottom of the plate and note the average count as cfu/cm².
Keep the lid closed during interpreting the growth in order to avoid the release of the microorganisms.