Photodegradation of Aflatoxin B1 in peanut oil

摘要

A photodegradation study of aflatoxin B1 (AFB1) in peanut oil was performed under UV irradiation at different AFB1 initial concentrations and UV irradiation intensities. The UV intensity and the irradiation duration on the AFB1 photodegradation ratio is more effective, when compared with AFB1 initial concentration, and AFB1 with initial concentration of 2 mg/kg can be degraded thoroughly within 30 min under the intensity of 800 μw/cm2. The photodegradation of AFB1 between the selected ranges of concentrations was proved to follow first-order reaction kinetics well (R 2 ≥ 0.99). The Ames test, employing Salmonella typhimurium tester strains TA98 and TA100, was employed to evaluate the residual toxicity of the AFB1 subproducts in peanut oil, and the results indicated that the mutagenic activity of UV-treated samples (800 μw/cm2 × 30 min) was completely lost compared with that of untreated samples, providing clues to the assessment of safety issues of UV method applied in AFB1 decontamination.