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Microbial Harboring Characteristics of Dishmachine-Filmed Glassware.

P M Schneider1, F F Busta1, C R McDUFF1

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Dishwasher films containing calcium (Ca++) can harbor Bacillus subtilis spores, posing public health and food spoilage risks. Detergent formulations significantly reduced both film deposition and spore harborage.

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Area of Science:

  • Food Science
  • Microbiology
  • Environmental Science

Background:

  • Alkaline-earth films form on dishes during mechanical washing.
  • The public health and food spoilage implications of these films are unknown.
  • Bacillus subtilis spores can contaminate dishwashing water.

Purpose of the Study:

  • To investigate the relationship between film formation and Bacillus subtilis spore deposition on dishes.
  • To evaluate the impact of different detergent formulations on this association.
  • To assess the public health and food spoilage potential of dishwasher films.

Main Methods:

  • A film-producing model system using sterile glass petri dishes and Bacillus subtilis spores was developed.
  • Dishes were washed in an institutional dishmachine with varying water hardness and detergent formulations.
  • Film deposition was quantified using atomic absorption spectrophotometry (Ca++ per cm²).
  • Spore recovery from washed dishes was correlated with film deposition.

Main Results:

  • Film deposition and Bacillus subtilis spore harborage were directly correlated above a threshold of 3 μg Ca++ per cm².
  • This correlation was influenced by the number of dishmachine cycles and water hardness.
  • All tested detergent formulations inhibited both film deposition and spore harborage to varying degrees.

Conclusions:

  • Dishware filming presents potential public health and food spoilage concerns due to bacterial spore harborage.
  • Detergent composition plays a crucial role in mitigating film formation and associated microbial risks.
  • Further research is needed to fully understand the public health impact of dishwasher films.