Degradation of Aflatoxins by Food Additives

Abstract

Degradation of four aflatoxins (AFB1, AFB2, AFG1 and AFG2) by food additives was investigated. Pure aflatoxins were degraded by treatment with solutions of acidic food additives (hydrochloric acid:HCl and sulfuric acid:H2SO4), alkaline food additives (sodium bicarbonate:NaHCO3, sodium carbonate:Na2CO3, sodium hydroxide:NaOH, sodium sulfite:Na2SO3, and sodium hypochlorite:NaOCl) and neutral food additives (potassium metabisulfite:K2S2O5, sodium bisulfite:NaHSO3, sodium hydrosulfite:Na2S2O4, hydrogen peroxide:H2O2, sodium chlorite:NaClO2, and ammonium peroxodisulfate:(ÑH4)2S2O8). The aflatoxins were treated with these neutral food additives under several conditions, and the effects of treatment temperature, time, and concentration of food additives on aflatoxin degradation were studied. Potassium bromate (KBrO3), potassium nitrate (KNO3), and sodium nitrite (NaNO2) had no effect on aflatoxins. Of the aflatoxin added to corn, 20% AFB, remained after treatment with the solution of NaHSO3 (0.5%, 48 h), but all of the AFB1 was completely degraded by NaClO2 (0.25%, pH 4, 48 h) and (NH4)2S2O8 (0.25%, 48 h) at 60°C. Of the aflatoxins added to butter beans, less than 20 and 5% of AFB1 remained after boiling treatment with a 2 and 0.5% solution of Na2S2O4, respectively. These findings suggested that aflatoxins can be degraded or removed by treatment with food additives during food processing.