Abstract
Aflatoxin B(1) (AFB(1)) contamination in food and feed is a global health and economic threat, necessitating the immediate development of effective strategies to mitigate its negative effects. This study focuses on the isolation and characterization of Enterococcus faecium HB2-2 (E. faecium HB2-2) as a potent AFB(1)-degrading microorganism, using morphological observation, biochemical profiling, and 16S rRNA sequence analysis. An incubation of E. faecium HB2-2 at 32 °C for 96 h in a pH 10 nutrient broth (NB) medium resulted in a remarkable degradation rate of 90.0% for AFB(1). Furthermore, E. faecium HB2-2 demonstrated 82.9% AFB(1) degradation rate in the peanut meal, reducing AFB(1) levels from 105.1 to 17.9 μg/kg. The AFB(1) degradation ability of E. faecium HB2-2 was found to be dependent on the fermentation supernatant. The products of AFB(1) degradation by E. faecium HB2-2 were analyzed by liquid chromatography-mass spectrometry (LC-MS), and a possible degradation mechanism was proposed based on the identified degradation products. Additionally, cytotoxicity assays revealed a significant reduction in the toxicity of the degradation products compared to the parent AFB(1). These findings highlight the potential of E. faecium HB2-2 as a safe and effective method for mitigating AFB(1) contamination in food and feed.