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Mycotoxins: Types, Health Effects & Food Safety Strategies

Mycotoxins are toxic secondary metabolites produced by filamentous fungi (molds) that contaminate crops pre-harvest, during storage, or in processing. They pose significant health risks to humans and animals through dietary, inhalational, and dermal exposure.

Major Mycotoxins & Health Impacts

Mycotoxin	Producing Fungi	Common Foods	Key Health Effects
Aflatoxins (B1, B2, G1, G2, M1)	Aspergillus flavus, A. parasiticus	Peanuts, maize, tree nuts, spices, dried figs, milk (M1)	Potent hepatocarcinogen (Group 1); acute aflatoxicosis (liver necrosis); immunosuppression; stunting in children
Ochratoxin A	A. ochraceus, Penicillium verrucosum	Cereals, coffee, cocoa, wine, dried fruit, spices, pork	Nephrotoxic (Balkan endemic nephropathy); immunosuppression; teratogenic; possible carcinogen (Group 2B)
Fumonisins (B1, B2, B3)	Fusarium verticillioides, F. proliferatum	Maize, maize products	Equine leukoencephalomalacia (ELEM); porcine pulmonary edema; hepatocarcinogen (Group 2B); neural tube defect risk
Trichothecenes (DON, T-2, HT-2, NIV)	Fusarium, Stachybotrys, Trichoderma	Wheat, barley, oats, maize, rice	DON (vomitoxin): feed refusal, vomiting, immune modulation; T-2: radiomimetic (bone marrow, GI, skin toxicity)
Zearalenone (ZEN)	Fusarium graminearum	Maize, wheat, barley	Estrogenic: reproductive disorders, infertility, precocious puberty (animals); human data limited
Patulin	Penicillium, Aspergillus	Apples, apple juice, rotting fruit	Genotoxic, immunotoxic; regulated in juice (FDA 50 µg/kg)

Exposure Routes

Dietary (primary): Contaminated plant/animal products (carry-over).
Inhalation: Occupational (grain handling, waste management), indoor damp/moldy environments.
Dermal: Occupational, contaminated materials.

Regulatory Limits (Examples)

FDA/US: Aflatoxins 20 ppb (food/feed); Patulin 50 ppb (apple juice); DON advisory levels (1 ppm finished wheat products).
EU: Comprehensive, stricter limits (e.g., aflatoxin B1 2 µg/kg cereals; OTA 3 µg/kg cereals; DON 750–1750 µg/kg).
Codex Alimentarius: International standards for trade.

Prevention & Control Strategies

Good Agricultural Practices (GAP): Crop rotation, resistant varieties, timely harvest, insect control.
Post-harvest: Rapid drying (<13% moisture), proper storage (temp/humidity control), aeration.
Processing: Sorting, cleaning, milling (removes contaminated fractions), nixtamalization (reduces fumonisins 80–90%).
Detoxification: Adsorbents (bentonite, yeast cell walls) in animal feed; limited food applications.
Surveillance: National monitoring programs, rapid test kits, HACCP integration.

Consumer Advice

Buy from reputable sources; avoid visibly moldy/damaged grains, nuts, dried fruit.
Store dry goods cool, dry, airtight; use promptly.
Diversify diet—reduces chronic single-mycotoxin exposure.
Discard moldy food entirely (mycotoxins penetrate beyond visible mold).

Mycotoxin control requires farm-to-fork vigilance. Regulatory frameworks, industry compliance, and consumer awareness collectively protect public health.