Prevalence and distribution of aflatoxin contamination in groundnut (Arachis hypogaea L.) in Mali, West Africa uri icon

abstract

  • Groundnut is a major source of livelihood for the rural poor in Mali. However, the crop is prone to preandpost-harvest aflatoxin contamination caused by Aspergillus flavus and Aspergillus parasiticus.Therefore, to minimize health related hazards from exposure to aflatoxin contaminated food, informationon the prevalence and distribution of aflatoxins (AFB1) in the groundnut value chain in Mali is needed fortimely interventions. To this end, a study was undertaken in three districts (Kayes, Kita and Kolokani) toassess aflatoxin contamination in the field and storage. Ninety pod samples in each district werecollected from fields (30 villages/district and 3 samples/village) during 2009 and 2010. Pre-harvestcontamination was estimated at harvest, whereas samples for post-harvest contamination werecollected from granaries of the same farmers at a monthly interval for 3 months. The villages in eachdistrict were categorized into safe, acceptable, moderate risk and high risk areas based on pre-harvestAFB1 levels. Kayes recorded more pod samples (77%) within 20 mg/kg of pre-harvest aflatoxins followedby Kolokani (55.6%) and Kita (45.6%) based on 2009 and 2010 mean values. Toxin concentrations atharvest were comparatively less in Kayes during both years. Further, Kayes had more villages under safeand acceptable limits when compared to Kolokani and Kita. Overall, 46 out of 90 villages in the threedistricts had acceptable pre-harvest toxin limits. Further, 12 villages in Kolokani were in the high riskcategory. An increase in toxin levels was noticed with period of storage during both years. Comparatively,toxin levels after storage were least in Kayes during 2009. Kayes also recorded less AFB1 levels in 2010after Kita. Our results indicate that Kayes is relatively safe over Kita and Kolokani in pre-harvest aflatoxincontamination. The reasons for district-wide variations in pre-harvest contamination; and the reasonsfor post-harvest flare up of the problem are discussed. Further, proper storage of pods at farmers' granariesin Mali is suggested to overcome the problem from reaching alarming levels

publication date

  • 2015
  • 2015