Distribution of fungi and aflatoxins in a stored peanut variety
Viviane Kobuchi Nakai, Liliana de Oliveira Rocha, Edlayne Gonçalez, Homero Fonseca, Edwin Moisés Marcos Ortega and Benedito Corrêa
Food Chemistry, Volume 106, Issue 1, 1 January 2008, Pages 285-290
2008
บทคัดย่อ
The objective of the present study was to evaluate the mycoflora and occurrence of aflatoxins in stored peanut samples (hulls and kernels) from Tupã, State of São Paulo, Brazil. The samples were analyzed monthly over a period of one year. The results showed a predominance of Fusarium spp. (67.7% in hulls and 25.8% in kernels) and Aspergillus spp. (10.3% in hulls and 21.8% in kernels), and the presence of five other genera. The growth of Aspergillus flavus was mainly influenced by temperature and relative humidity. Analysis of hulls showed that 6.7% of the samples were contaminated with AFB1 (mean levels = 15–23.9 μg/kg) and AFB2 (mean levels = 3.3–5.6 μg/kg); in kernels, 33.3% of the samples were contaminated with AFB1 (mean levels = 7.0–116 μg/kg) and 28.3% were contaminated with AFB2 (mean levels = 3.3–45.5 μg/kg). Analysis of the toxigenic potential revealed that 93.8% of the A. flavus strains isolated were producers of AFB1 and AFB2.