A study on the toxicity of spontaneously molded bread

Area of Science:

• Food Science
• Mycology
• Toxicology

Background:

• Spontaneous mold growth in bread can lead to mycotoxin contamination.
• Finnish bread is a staple food susceptible to mold spoilage.
• Certain molds produce toxins harmful to human and animal health.

Purpose of the Study:

• To identify mold species in Finnish bread.
• To quantify mycotoxin levels, specifically patulin, aflatoxins, and ochratoxin A.
• To assess the toxicity of mold-contaminated bread through animal feeding studies.

Main Methods:

• Isolation and identification of mold genera (Penicillium, Aspergillus, Paecilomyces) from molded Finnish bread samples.
• Quantification of patulin using analytical methods (concentration range: 27-138 microgram/kg).
• Testing for aflatoxins and ochratoxin A, and penicillic acid.
• In vivo toxicity assessment using rat feeding trials with bread extracts.

Main Results:

• Patulin was detected in 91% of analyzed samples, with higher concentrations in dark bread.
• Aflatoxins and ochratoxin A were not detected in any samples.
• Penicillic acid was found in one sample.
• Rat feeding studies showed no significant changes in hemoglobin or leucocyte counts, indicating low toxicity.
• Extracts from bread contaminated with Aspergillus niger exhibited higher toxicity and lower palatability.

Conclusions:

• Finnish bread is frequently contaminated with patulin-producing molds.
• Patulin levels in molded bread warrant attention, especially in dark varieties.
• The overall toxicity of the molded bread, as assessed by rat feeding trials, appears relatively low.
• Further research may be needed to understand the long-term effects and specific toxic components.