Aspergillus parasiticus

A species of fungus known for producing aflatoxins

Aspergillus parasiticus is a species of fungus in the genus Aspergillus. It is known for its ability to produce aflatoxins, which are potent carcinogens and can contaminate food supplies, posing significant health risks to humans and animals.

Description

Aspergillus parasiticus is a filamentous fungus that is commonly found in soil and decaying vegetation. It is closely related to Aspergillus flavus, another aflatoxin-producing species. The colonies of A. parasiticus are typically green to yellow-green in color and have a powdery texture due to the production of conidia (asexual spores).

Habitat and Ecology

Aspergillus parasiticus thrives in warm and humid environments. It is commonly found in tropical and subtropical regions, where it can contaminate crops such as peanuts, corn, and tree nuts. The fungus can grow on a variety of substrates, including stored grains and seeds, especially under conditions of high moisture and temperature.

Aflatoxin Production

Aspergillus parasiticus is one of the primary producers of aflatoxins, particularly aflatoxin B1, which is the most toxic and carcinogenic form. Aflatoxins are secondary metabolites that can contaminate food and feed, leading to aflatoxicosis in humans and animals. Chronic exposure to aflatoxins is associated with an increased risk of liver cancer.

Health Implications

Exposure to aflatoxins produced by A. parasiticus can occur through the consumption of contaminated food products. Aflatoxins are highly stable and can persist in food even after processing. The World Health Organization (WHO) and other health agencies have established maximum allowable levels of aflatoxins in food to minimize health risks.

Prevention and Control

Preventing contamination by Aspergillus parasiticus involves proper agricultural practices, such as drying crops thoroughly before storage and maintaining low humidity levels in storage facilities. Biological control methods, such as using non-toxigenic strains of Aspergillus to outcompete toxigenic strains, are also being explored.

Also see

• Aspergillus flavus
• Aflatoxin
• Mycotoxin
• Fungal contamination in agriculture

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