Lecture sixteen 11 05 08

Lecture sixteen 11 05 08 - Visibly damaged produce is not...

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Visibly damaged produce is not sold
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Fungal To people or animals Produced by fungi growing on food Damage is not visible $1.5 billion/year lost due to mycotoxins
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No one would eat this
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But what did the tomatoes that went into these products look like?
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An example of: bulked produce ?
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Quality control Post-harvest Mold counts Too much mold lot is rejected
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Toxicity of most compounds is unknown Fungi produce many potentially toxic compounds Bioassay
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Bioassay Test for a biological effect Ergot Ergotism Some times humans were the test subjects
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DIVERSE DIET LIMITS RISK Consumption of contaminated food will be limited Acute toxicity unlikely
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Domesticated animals
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Animal diet Limited diversity If the predominant component is contaminated, toxic effects may be evident
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TURKEY X DISEASE England in 1960 100,00 birds died Liver damage [no pathogens detected]
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They were fed peanuts What did they have in common?
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Aspergillus flavus Contaminated peanuts Control
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Aflatoxin Aspergillus flavus No color, odor or taste Toxic to the liver Immunosuppressive Carcinogenic
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FOUR MAJOR FORMS B 1 2 G 1 2 A. flavus Most prevalent & most toxic
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Aflatoxin B 1 Aflatoxin M 1 Liver
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Aspergillus flavus Peanuts Corn Pistachios Almonds Dietary sources of aflatoxins
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Dust Inhalation Occupational
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Conditions favoring growth of A. flavus Dry substrate Damaged produce
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Naval orange worm damage Almonds If not for aflatoxins 24 million pounds lost per year Could be sold chipped or as paste
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18.0 mg/kg Acute toxicity How toxic are aflatoxins? LD
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This note was uploaded on 10/03/2009 for the course SAS 30 taught by Professor Wilhelm during the Fall '08 term at UC Davis.

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Lecture sixteen 11 05 08 - Visibly damaged produce is not...

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