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Colony-Forming Unit Enumeration by a Plate-MPN Method.

S-T Tan1, R B Maxcy1, W W Stroup1

  • 1Department of Food Science and Technology; Biometrics and Information Center, University of Nebraska-Lincoln, Lincoln, Nebraska 68583-0919.

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|March 30, 2019
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Summary
This summary is machine-generated.

A new plate-most probable number (MPN) method combines surface plate and MPN techniques for microbial enumeration. This method is accurate and offers advantages over traditional microbial counting methods.

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Area of Science:

  • Microbiology
  • Analytical Chemistry

Background:

  • Traditional microbial enumeration methods like the standard surface plate method and the most probable number (MPN) method have limitations.
  • There is a need for improved techniques that are accurate, efficient, and offer practical advantages.

Purpose of the Study:

  • To introduce and evaluate a novel microbial enumeration technique, the plate-most probable number (plate-MPN) method.
  • To compare the accuracy and precision of the plate-MPN technique against the standard surface plate method.

Main Methods:

  • The plate-MPN technique involves inoculating discrete 0.01-ml samples onto quadrants of pre-dried petri plates.
  • Growth observation and interpretation are analogous to a 3-tube MPN test using standard tables.
  • The technique was applied to pure cultures and mixed flora for validation.

Main Results:

  • The plate-MPN technique demonstrated comparable accuracy to the standard surface plate method for microbial counts.
  • The plate-MPN technique was found to be less precise than the standard surface plate method.
  • No significant differences in accuracy were observed when applied to pure cultures and mixed flora.

Conclusions:

  • The plate-MPN technique offers a viable alternative for microbial enumeration.
  • Despite lower precision, the plate-MPN method presents numerous advantages over traditional microbial counting techniques.
  • Further research may explore optimizing the precision of the plate-MPN method.