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A Flooded Plate Loop Count Procedure 1.

R L Olsen1, G H Richardson1

  • 1Department of Nutrition & Food Sciences, Utah State University, Logan, Utah 84322.

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|March 3, 2019
PubMed
Summary
This summary is machine-generated.

A modified plate loop count method for milk samples improves colony uniformity. This enhanced procedure for microbial analysis shows high correlation with conventional methods, ensuring reliable bacterial enumeration.

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Area of Science:

  • Microbiology
  • Food Science
  • Dairy Science

Background:

  • Accurate microbial enumeration in milk is crucial for quality control and safety.
  • Traditional plate loop count methods can sometimes yield uneven colony distribution.
  • Standardization of microbiological testing procedures is essential for reproducible results.

Purpose of the Study:

  • To describe a modified plate loop count procedure for analyzing milk samples.
  • To evaluate the impact of the modified method on colony uniformity and statistical characteristics.
  • To compare the results of the modified method with the conventional plate loop count.

Main Methods:

  • A modified plate loop count procedure was developed using a 0.5-ml diluent loop-rinse onto pre-dried agar in a 100-mm petri plate.
  • Milk samples were distributed using a glass spreader, followed by drying and standard incubation.
  • The modified method was statistically compared to the conventional plate loop count method.

Main Results:

  • The modified plate loop count procedure resulted in more uniform colony formation compared to the conventional method.
  • The statistical characteristics of the plate loop count on raw milk samples were not significantly altered.
  • A high correlation coefficient of 0.91 was observed between the modified (flooded) and conventional plate loop counts.

Conclusions:

  • The modified plate loop count method offers improved colony uniformity for milk sample analysis.
  • This technique provides a reliable alternative for bacterial enumeration in raw milk, maintaining statistical validity.
  • The enhanced procedure is a valuable modification for routine microbiological testing in the dairy industry.