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Associated mycoflora of rye bread
F Lund1, O Filtenborg, S Westall
1Department of Biotechnology, Technical University of Denmark, Lyngby, Denmark.
Abstract:
Penicillium roqueforti (27%), P. corylophilum (20%) and Eurotium species (15%) made up the important mycoflora associated with rye bread on 3425 identified fungi isolates. These fungi were dominant as spoilers of packaged rye bread in almost every month of a 4 year investigation. Penicillium decumbens (3%), Paecilomyces variotti (8%) and Aspergillus flavus (5%) were found more rarely, but were the major species found over periods of a few months. Penicillium commune (5%), P. solitum (4%), A. niger (4%) and Mucor species (2%) were a constant, but small, part of the total mycoflora of rye bread. Identification of the fungi in the production environment in a rye bread factory showed the locality of potential contamination sources. Elimination of the contamination sources by improved cleaning and disinfection procedures quickly resulted in a significant reduction in the frequency of mould growth in the packaged rye bread.
Insights
Dominant fungi like Penicillium roqueforti spoil packaged rye bread. Improving factory hygiene significantly reduced mould growth, ensuring product quality.
Area of Science:
- Food Microbiology
- Mycology
- Industrial Microbiology
Background:
- Mould contamination is a significant issue affecting the shelf-life and safety of packaged rye bread.
- Understanding the mycoflora associated with rye bread is crucial for developing effective spoilage control strategies.
Purpose of the Study:
- To identify the dominant fungal species contaminating rye bread.
- To investigate the sources of fungal contamination within a rye bread production environment.
- To assess the impact of improved hygiene practices on reducing mould growth.
Main Methods:
- Isolation and identification of 3425 fungal isolates from packaged rye bread over a 4-year period.
- Fungal analysis of the production environment to pinpoint contamination sources.
- Implementation and evaluation of enhanced cleaning and disinfection protocols.
Main Results:
- Penicillium roqueforti (27%), P. corylophilum (20%), and Eurotium species (15%) were the most prevalent spoilage fungi.
- Less common but significant spoilers included Penicillium decumbens, Paecilomyces variotti, and Aspergillus flavus.
- Identification of specific factory locations as potential contamination sources.
- Improved cleaning and disinfection led to a rapid and significant decrease in mould contamination.
Conclusions:
- Effective control of rye bread spoilage requires a comprehensive understanding of associated mycoflora.
- Targeting and eliminating contamination sources in the production environment is key to reducing mould growth.
- Enhanced hygiene protocols are critical for maintaining the quality and safety of packaged rye bread.