Influencia da calagem, da epoca de colheita e da secagem na incidencia de fungos e aflatoxinas em graos de amendoim armazenadosStorage peanut kernels fungal contamination and aflatoxin as affected by liming, harvest time and drying

摘要

The objective of this work was to evaluate the effect of the storage on the potential of aflatoxin production by isolates from Aspergillus flavus group in peanut (Arachis hypogaea L.). These kernels were obtained from a field experiment with two areas (with or without lime), three times of harvest (104, 114 and 124 days after planting) and two types of dryer conditions (ambient and chamber with forced air). After 12 and 18 months of storage, the kernels were treated with sodium hypochloride and incubated in a PDA at 20 degrees C during five days. The isolates from Aspergillus flavus group were identified after incubation in ADM culture medium. The toxigenic potential was analyzed by thin layer chromatography. The genera detected were Aspergillus, Penicillium and Fusarium. The kernels from the first harvest, showed higher contamination by the Aspergillus flavus group, but the small proportion with toxigen potential.