Scientific Basis: How Quanti-Tray Works
Quanti-Tray Scientific Basis
By dividing the 100 mL sample into 51 wells, Quanti-Tray uses the Standard Method Most Probable Number (MPN) approach to determine
the number of bacteria in the original sample. Automation minimizes hands-on time and maximizes throughput (up to four samples per minute). The relatively large number of wells provides a high counting range (200/100 mL without dilutions), and very tight 95% confidence limits.
Quanti-Tray/2000-Scientific Basis
IDEXX's Quanti-Tray/2000 is based on the same statistical
model as the traditional 15-tube serial dilution. In the serial dilution
method, varied amounts of sample are distributed into tubes. Dilution
water is then added as necessary to fill the tubes and cover the durham
tubes. With the Quanti-Tray/2000, the sample is automatically divided
into the proper portions by the Quanti-Tray®
Sealer, without test tubes,
durham tubes, measuring or dilution water. By automatically distributing
the sample into 97 wells of two different sizes, Quanti-Tray/2000 yields
a counting range of one to 2,419 with a far better 95% confidence limit
than a 15-tube serial dilution.
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15-Tube Serial Dilution vs. Quanti-Tray/2000
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