Safety evaluation of aflatoxin B_1 in peanut oil after ultraviolet irradiation detoxification in a photodegradation reactor

摘要

The high incidence of aflatoxin B_1 (AFB_1) in peanut oil has caused wide public concern in the world. Many studies have verified that ultraviolet (UV) irradiation can degrade AFB_1 in foods. A new photodegradation reactor has been developed to study the photodegradation efficiency of AFB_1 in peanut oil, and the safety of peanut oil was evaluated after UV irradiation detoxification based on the mutagenicity of Salmonella typhimurium tester strains and cytotoxicity of HepG2 cells. The results showed that AFB_1 in peanut oil could be decomposed efficiently using the photodegradation reactor. AFB_1 was decreased from 51.96 ± 4.24 to 7.23 ± 0.59 μg kg~(-1) in 10 min and reduced by 86.08% compared with that of the negative control. The residual AFB] in peanut oil was far less than the limit level set by Chinese government (20 μg kg~(-1)). The Ames test and cell viability assay revealed that 10 min of UV irradiation reduced significantly the toxicity of AFB_1 in peanut oil. All the results suggest that the deleterious effects of AFB_1 can be highly reduced by UV irradiation in the photodegradation reactor, and the reactor can be applied in a large scale in detoxification of AFB_1 in peanut oil in the oil industry.