Degradation of Aflatoxin B1 in Dried Figs by Sodium Bisulfite With or Without Heat, Ultraviolet Energy or Hydrogen Peroxide

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Abstract
Dried fig fruits were spiked to contain 250 ppb aflatoxin B1 (AFB1) and treated with sodium bisulfite (1% in the aqueous phase of the mixture). This treatment caused 28.2% of added toxin to degrade in 72 h at 25°C. When hydrogen peroxide (H2O2, 0.2% in the aqueous phase) was added 10 min before the bisulfite treatment, 65.5% of added toxin was degraded in 72 h. In both instances, most of the degradation occurred during the second day of treatment. Heating bisulfite-treated samples at 45 to 65°C for 1 h caused up to 68.4% of added AFB1 to be degraded. Ultraviolet radiation (from a low-energy source) degraded 45.7% of AFB1 in fig samples that were treated for 30 min; the rate of degradation was not enhanced when bisulfite or H2O2 was present during this treatment.

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