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Aflatoxin contamination Aflatoxin contamination of Groundnutof Groundnut
Farid WaliyarPeter Craufurd, T Yellamanda Reddy,
Tim Wheeler, K Subramanyam, A Subramaniam, Balaraju, Gareth McGay, A Brown, R S S Hopper
Aflatoxin contamination Aflatoxin contamination of Groundnutof Groundnut
Introduction Importance of aflatoxin1. Groundnut and other by
products2. Health3. Market Detection of aflatoxins.
InoductionInoduction
Aflatoxins are produced by Aspergillus flavus / A. parasiticus
Efect of aflatoxin on cropsEfect of aflatoxin on crops
Many crops are affected
Maize, Groundnut, Soybean, Cotton, Chili etc..
Can occur at all levels of crop production:– Pre-harvest, harvest, and storage
Effects of Aflatoxin on Effects of Aflatoxin on crops crops (conted)(conted)
Deteriorate qualityOil/groundnut cakeContaminated food / feed can
affect human and animal healthImportant for International trade
Effects of Aflatoxin on Effects of Aflatoxin on crops crops (contd)(contd)
Contamination in haulms– Small pods not collected
Fed to the cattle– Affect animal Health
Haulms/pods– 31% contained >30 μ g/kg (30-3964 μ g/kg)
Aflatoxin in MilkAflatoxin in Milk
MilkCattle fed with contaminated feeds
– Haulms– Groundnut or cotton cakes– Maize
Aflatoxin B1 → M1
– Just as toxic– ELISA test developed (antibodies)
Aflatoxin in MilkAflatoxin in Milk
As the main source of contamination are small pods Aflatoxin M1 can be present in the milk
Milk analyzed from buffaloes fed with haulms/small pods showed 22.5% of samples had >0.5 ng/L of AFM1
Effects of Aflatoxin on Effects of Aflatoxin on healthhealth
Adverse effects on human health and livestock.
Blood tests have shown that very high percentage of the population of several countries in Asia and Africa are exposed to aflatoxins.
Effect of aflatoxin on healthEffect of aflatoxin on healthHuman beings and Livestock
– Cattle– Poultry
Deleterious effects– Teratogenic– Immunosuppressive – Many times enhanced in the presence of
hepatitis B and C viruses. – Carcinogenic
Cancers with Cancers with p53 p53 mutation mutation (NIMS)(NIMS)
LungLiverPancreasColonOvary etc..
The confounding factorsThe confounding factors
Hepatitis B and CMalnutritionAlcoholic liver disease
MarketabilityMarketability
Limiting factor for exports to developed countries
Regulations are stringent– 4 μ g/kg <: EU– None: Japan
Local market and health
Estimation of aflatoxinsEstimation of aflatoxins
– Cost-effective technologies required– DFID-flexibility fund– ELISA for aflatoxin detection was developed
which reduced the estimation cost
Further information and data will be presented later