RESUMO
The significance of fungal contamination during the storage of sunflower seeds has been investigated. Samples were taken during 7 months at 45 day-intervals. Water activity, seed germination, presence of aflatoxin B1 and free fatty acids were monitored. It was demonstrated that water activity increased during storage, germinability decreased, the content of free fatty acid increased and so did the content of aflatoxin B1.
Assuntos
Microbiologia de Alimentos , Conservação de Alimentos , Fungos/crescimento & desenvolvimento , Helianthus/microbiologia , Sementes/microbiologia , Aflatoxina B1 , Aflatoxinas/análise , Ácidos Graxos não Esterificados/análise , Água/análiseRESUMO
Growth and aflatoxin production by Aspergillus parasiticus NRRL 2999 and Aspergillus parasiticus RC 12 were studied both in sunflower seed and a synthetic culture medium (with and without zinc enrichment). On a synthetic culture medium the strains behaved in different ways according to the zinc concentration. In sunflower seed medium the influence of zinc was not so evident. Thus the results show that the influence of zinc is not the same for different strains and substrates.