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Multiple Enzyme Technology Medium—SimPlate for
HPC medium uses IDEXX's Multiple Enzyme Technology™ (MET™) to detect heterotrophic
plate count (HPC) bacteria in water. The reagent contains multiple unique
enzyme-substrates, each targeting a different bacterial enzyme. The most
common enzymes of waterborne bacteria are all targeted.
All of the enzyme-substrates produce the same signal
when metabolized. Therefore, a given waterborne bacteria will be able
to metabolize one or more enzyme-substrate and produce a signal. In the
case of SimPlate for HPC, the signal is fluorescence under 365 nm UV light.
After the sample and medium are added to the plate, the wells
fill automatically as the user swirls the plate. No pipetting is needed.
Once the wells are filled, the plate is angled and excess
sample/medium mixture is poured into the absorbent pad. The SimPlate takes
advantage of surface tension to hold the proper amount of sample/medium
mixture in each of its 84 wells as excess is poured off.
SimPlates are incubated upside down to prevent condensation
from collecting on the lid. Since each well is isolated from the others,
bacteria from one well will cause only that one well to fluoresce.
The number of wells that fluoresce is converted to a
Most Probable Number (MPN) using the table provided with the product.
The high number of wells (84) results in a very high counting range and
precise 95% confidence limits. The counting range is from <1 to 738 per
plate (more than double a standard pour plate) with the Multi-dose SimPlate
for HPC. | 
