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IARC MONOGRAPHS ON THE EVALUATION OF CARCINOGENIC ...

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178<br />

indicates that A. flavus and A. parasiticus are responsible for the overwhelming proportion<br />

of aflatoxins found in foodstuffs throughout the world. Of the other species, only<br />

A. australis, which appears to be widespread in the southern hemisphere and is common<br />

in Australian peanut soils, may also be an important source of aflatoxins in a few<br />

countries.<br />

1.2.2 Production and reduction<br />

Apart from natural formation, aflatoxins are produced only in small quantities for<br />

research purposes, by A. flavus or A. parasiticus fermentations on solid substrates or<br />

media in the laboratory. Aflatoxins are extracted by solvents and purified by chromatography.<br />

Total annual production is less than 100 g (<strong>IARC</strong>, 1993).<br />

Aflatoxins occurring naturally in foods and feeds may be reduced by a variety of procedures.<br />

Improved farm management practices, more rapid drying and controlled storage<br />

are now defined within GAP (Good Agricultural Practice) or HACCP (Hazard Analysis:<br />

Critical Control Point) (FAO, 1995). By segregation of contaminated lots after aflatoxin<br />

analyses and by sorting out contaminated nuts or grains by electronic sorters, contaminated<br />

lots of peanuts or maize can be cleaned up to produce food-grade products.<br />

Decontamination by ammoniation or other chemical procedures can be used for<br />

rendering highly contaminated commodities suitable as animal feeds. More detailed<br />

information on these topics is given in the Annex to this Monograph.<br />

1.2.3 Uses<br />

<strong>IARC</strong> <strong>M<strong>ON</strong>OGRAPHS</strong> VOLUME 82<br />

Table 3. Aspergillus species capable of producing aflatoxins<br />

Species<br />

Mycotoxins produced<br />

AFB AFG CPA<br />

Aflatoxins are not used commercially, only for research.<br />

Major sources Geographical distribution<br />

A. flavus + – – All kinds of foods Ubiquitous in warmer<br />

latitudes<br />

A. parasiticus + + – Peanuts Specific areas<br />

A. nomius + + – Bees USA, Thailand<br />

A. pseudotamarii + – + Soil Japan<br />

A. bombycis + + – Silkworm frass Japan, Indonesia<br />

A. ochraceoroseus + – – Soil Africa<br />

A. australis + + + Soil, peanuts Southern hemisphere<br />

AFB, B aflatoxins; AFG, G aflatoxins; CPA, cyclopiazonic acid

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