Growth and Aflaxtoxin Production by Aspergillus parasiticus in the Presence of Lactobacillus casei

Area of Science:

• Microbiology
• Mycology
• Food Safety

Background:

• Aflatoxins are toxic secondary metabolites produced by Aspergillus species.
• Lactobacillus casei is a probiotic bacterium with potential antagonistic effects against fungi.
• Understanding microbial interactions is crucial for controlling aflatoxin contamination.

Purpose of the Study:

• To investigate the impact of co-culturing Aspergillus parasiticus and Lactobacillus casei on aflatoxin production and degradation.
• To evaluate the effect of sequential inoculation (L. casei pre-culture) on the interaction.

Main Methods:

• Mineral salts-glucose broth was used as the culture medium.
• Aspergillus parasiticus and Lactobacillus casei were inoculated simultaneously or sequentially.
• Incubation was performed at 28°C for 10 days.
• Bacterial survival, fungal growth, and aflatoxin production/degradation were monitored.

Main Results:

• Simultaneous inoculation led to increased L. casei survival, comparable A. parasiticus growth, reduced aflatoxin production, and enhanced aflatoxin degradation.
• Pre-culturing L. casei resulted in better L. casei survival, slower A. parasiticus growth, significantly less aflatoxin production, and no apparent aflatoxin degradation.

Conclusions:

• Co-culturing A. parasiticus with L. casei can mitigate aflatoxin contamination.
• Sequential inoculation with L. casei pre-culture offers a more effective strategy for reducing aflatoxin levels.
• These findings suggest potential applications in food preservation and safety.