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Thermoresistant Propagules of Neosartorya fischeri ; Some Ecologic Considerations

Zdenka Jesenská1, Elena Piecková1, Judita Sepitková2

  • 1Research Institute of Preventive Medicine, Limbová 14, 833 01 Bratislava, Czech and Slovak Federative Republic.

Journal of Food Protection
|May 5, 2019
PubMed

Insights

Neosartorya fischeri frequently causes spoilage in canned fruits. This study investigated its presence in soil and cereal substrates, finding it commonly in soil but rarely in cereals.

Area of Science:

  • Mycology
  • Food Science
  • Environmental Microbiology

Background:

  • Neosartorya fischeri is a key fungus responsible for the spoilage of canned fruits.
  • This fungus constituted a significant portion (49.2%) of identified strains from molded canned fruit samples.
  • The ecological distribution of Neosartorya fischeri remains understudied.

Purpose of the Study:

  • To investigate the prevalence and ecology of Neosartorya fischeri in soil and cereal substrates.
  • To determine the occurrence of thermoresistant propagules of N. fischeri in environmental samples.

Main Methods:

  • Soil and cereal substrate samples were collected from various locations.
  • Samples were treated with heat (70°C for 60 min) and cultured on Sabouraud agar with Rose Bengal.
  • Colony-forming units of N. fischeri were quantified per 10g of sample.

Main Results:

  • Neosartorya fischeri was isolated from 30 out of 31 soil samples, with an average of 27.6 colony-forming units per 10g.
  • Only three cereal substrate samples yielded N. fischeri, with low counts (1-7 colony-forming units per 10g).
  • One soil sample did not yield any N. fischeri colonies.

Conclusions:

  • Soil appears to be a significant reservoir for Neosartorya fischeri.
  • Cereal substrates are less frequently colonized by N. fischeri compared to soil.
  • Further research is required to understand the factors influencing the distribution of thermoresistant N. fischeri propagules.

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