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Growth and toxigenesis of Aspergillus flavus isolates on selected spices
H Bartine1, A Tantaoui-Elaraki
1Institut Agronomique et Vétérinaire Hassan II, Ecole doctorale, B.P. 6202-Institute, Rabat, Morocco.
Abstract:
None of the four Aspergillus flavus isolates studied was able to grow on wet cinnamon (5 g cinnamon + 3.3 mL distilled water) at 25 degrees C over 30 days. Fungal growth was weak on the curcumin, black pepper, and white pepper; good, but lower than on rice control, on the cumin and ginger; and similar to the control on sweet and hot paprika. No aflatoxin was detected in black or white pepper after 10 days at 25 degrees C. Cumin least inhibited aflatoxin synthesis, followed by hot paprika, cumin, sweet paprika, and ginger. The amount of aflatoxin detected in the spices at the end of the incubation period never exceeded 6.25% of that found in the rice control.
Insights
Certain spices inhibit Aspergillus flavus growth and aflatoxin production. Cinnamon completely prevented fungal growth, while others like cumin and ginger showed varying levels of inhibition for Aspergillus flavus and aflatoxin synthesis.
Area of Science:
- Food science
- Mycology
- Agricultural science
Background:
- Aspergillus flavus produces aflatoxins, which are toxic and carcinogenic contaminants in food.
- Spices are known to possess antimicrobial properties, but their specific effects on A. flavus and aflatoxin production require detailed investigation.
Purpose of the Study:
- To evaluate the inhibitory effects of various spices on the growth of Aspergillus flavus.
- To determine the impact of these spices on aflatoxin synthesis by A. flavus.
Main Methods:
- Four Aspergillus flavus isolates were cultured on wet cinnamon, curcumin, black pepper, white pepper, cumin, ginger, sweet paprika, and hot paprika at 25°C for 30 days.
- Fungal growth was assessed, and aflatoxin production was measured in selected spices over 10 days.
Main Results:
- Cinnamon completely inhibited A. flavus growth. Curcumin, black pepper, and white pepper showed weak inhibition.
- Cumin and ginger supported good fungal growth, while sweet and hot paprika showed growth similar to the control (rice).
- No aflatoxin was detected in black or white pepper. Cumin and hot paprika least inhibited aflatoxin synthesis, with overall contamination levels not exceeding 6.25% of the control.
Conclusions:
- Cinnamon exhibits potent antifungal activity against Aspergillus flavus.
- Several spices, including cumin and paprika, can reduce aflatoxin synthesis, though they may not fully inhibit fungal growth.
- The findings suggest potential applications of specific spices in controlling A. flavus contamination and aflatoxin in food products.