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Understanding the Non-Equivalency of Bio-Fluorescent Particle Counts versus the Colony-Forming Unit.

Joanny Salvas1, Petra Merker2, Mike Dingle3

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|July 14, 2023
PubMed
Summary

Newer microbiological methods like bio-fluorescent particle counting (BFPC) offer real-time monitoring. However, directly correlating auto-fluorescent units (AFUs) to colony-forming units (CFUs) is often inappropriate, yet shouldn't hinder adoption.

Keywords:
Alternative and rapid microbial methodsAuto-fluorescence unitsBio-fluorescent particle counters

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Area of Science:

  • Microbiology
  • Analytical Chemistry
  • Biotechnology

Background:

  • Emerging microbiological methods offer advantages like real-time monitoring.
  • Adopting new technologies requires a paradigm shift, especially when detection principles and units differ.
  • The traditional colony-forming unit (CFU) remains the gold standard for microbial contamination assessment.

Purpose of the Study:

  • To explore the challenges of adopting bio-fluorescent particle counting (BFPC) technology.
  • To examine the appropriateness of correlating auto-fluorescent units (AFUs) from BFPC to traditional CFUs.
  • To argue that a lack of consistent correlation should not impede the implementation of BFPC.

Main Methods:

  • Comparative analysis of BFPC technology and traditional CFU methods.
  • Exploration of the differing detection principles and units of measure (AFUs vs. CFUs).
  • In-depth examination of the correlation, or lack thereof, between AFUs and CFUs.

Main Results:

  • Direct correlation between auto-fluorescent units (AFUs) and colony-forming units (CFUs) is often inappropriate due to different detection principles.
  • A consistent correlation factor between AFUs and CFUs does not exist.
  • The lack of a direct correlation should not be a barrier to adopting BFPC technology.

Conclusions:

  • BFPC technology offers significant advantages for real-time microbial monitoring.
  • Attempts to force a direct correlation between AFUs and CFUs may be scientifically unsound.
  • The implementation of BFPC should focus on leveraging its unique capabilities rather than solely relying on CFU equivalence.