Patulin is a
mycotoxin produced by a variety of molds, particularly
Aspergillus and
Penicillium. It is commonly found in rotting apples, and the amount of patulin in apple products is generally viewed as a measure of the quality of the apples used in production. It is not a particularly potent toxin, but a number of studies have shown that it is
genotoxic, which has led to some theories that it may be a carcinogen, though animal studies have remained inconclusive. Patulin is also an antibiotic. Several countries have instituted patulin restrictions in apple products. The
World Health Organization recommends a maximum concentration of 50 µg/L in apple juice.
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