Abstract
Bacillus sp. H16v8 and Bacillus sp. HGD9229 were identified as Aflatoxin B1 (AFB1) degrader in nutrient broth after a 12 h incubation at 37 °C. The degradation efficiency of the two-strain supernatant on 100 μg/L AFB1 was higher than the bacterial cells and cell lysate. Moreover, degradations of AFB1 were strongly affected by the metal ions in which Cu2+ stimulated the degradation and Zn2+ inhibited the degradation. The extracellular detoxifying enzymes produced by co-cultivation of two strains were isolated and purified by ultrafiltration. The molecular weight range of the detoxifying enzymes was 20–25 kDa by SDS-PAGE. The co-culture of two strains improved the total cell growth with the enhancement of the total protein content and detoxifying enzyme production. The degradation efficiency of the supernatant from mixed cultures increased by 87.7% and 55.3% compared to Bacillus sp. H16v8 and HGD9229, individually. Moreover, after the degradation of AFB1, the four products of the lower toxicity were identified by LC-Triple TOF-MS with the two proposed hypothetical degradation pathways.
Highlights
The exposition of Aflatoxin B1 (AFB1 ) from contaminated food and feed is a serious threat to human and animal health because of its carcinogenicity, hepatotoxicity and immunosuppression and causes economic losses in agriculture on a global basis [1,2,3,4]
The results showed that the two Bacillus species could be co-cultured in the same medium
2, we found that compared to the cell lysate and cells, the AFB1 degradation was highest the in thedegradation supernatant. of AFB1 resulting from the extracellular proteins and perhaps the enzymes rather than the physical adsorption to the cells wall [28]
Summary
The exposition of Aflatoxin B1 (AFB1 ) from contaminated food and feed is a serious threat to human and animal health because of its carcinogenicity, hepatotoxicity and immunosuppression and causes economic losses in agriculture on a global basis [1,2,3,4]. The required effectiveness, safety, and nutritional retention have not been achieved [6]
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