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Toxins Questions

Question 1

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Answer 1

The fungi that form toxins in foodstuffs, such as Aspergillus parasiticus group, require warm moist conditions for growth. Thus peanuts which are stored under humid conditions are almost certainly conducive to the growth of the fungi.

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Question 2

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Answer 2

It is almost impossible to predict whether the fungi will be present and if present, whether they have formed toxins. Thus any contaminated food should not be consumed. Batches of seed suspected of being contaminated with Aspergillus parasiticus group can be screened by UV light and the hypothesis tested.

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Question 3

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Answer 3

If we are considering Aspergillus parasiticus group then probably yes. The fungi sporulate readily and the fungus forms small spores that disperse in air with the slightest of air motion. However, other fungi may remain relatively isolated within a body of grain, either because they sporulate only under specific conditions, or the fungus has not spread through the silo by hyphal elongation.

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Question 4

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Answer 4

Not necessarily. The conditions under which aflatoxins are formed are clear. All foodstuffs contaminated with any members of the Aspergillus parasiticus group will have some aflatoxin present. However, other toxigenic fungi are not as well understood. Generalisations cannot be made.

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Question 5

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Question 6

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Question 7

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