Migration of hazardous substances during peanut oil squeezing for their dietary assessment

Peanut contains a high amount of oil and protein; it is easy to be contaminated or produce hazard substances during storage and processing. The study systematically analyzed the migration of hazardous substances during peanut oil squeezing. The results indicated the concentration of AFB1, benzo [ɑ]pyrene (Bap), peroxide value, acid value and heavy metals in peanut oil did not exceed the limit standard in China. In the color sorting stage of peanut oil squeezing process, most of AFB1 and acid value contaminated peanut samples were eliminated. During peanut roasting stage, high temperature accelerated the oxidation of oil and the production of Bap. Therefore, the peroxide value and the concentration of Bap in the roasted peanut were significantly higher than that of unroasted peanut. After peanut oil squeezing, heavy metals were mainly concentrated in peanut meal. Except for Sn, the concentration of heavy metals in peanut oil was no more than 7% of that in peanut. The concentration of these hazard substances could not affect the quality and safety of peanut oil, nor posed a threat to human health. The results of this study provide data support for the fixed-point control of hazards substances during peanut oil squeezing.