The Efficacy of Ultraviolet LED Cold Light Detoxification Technology in Removing Aflatoxin B₁ from Peanut Oil and Its...

Peanut oil is prone to contamination with aflatoxin B₁ (AFB₁). Traditional ultraviolet (UV) irradiation methods demonstrate limited effectiveness in detoxification and may compromise the oil quality. To address this, this study developed a novel UV LED cold light source temperature control system, offering a new solution for AFB₁ detoxification in peanut oil production. On the basis of this system, peanut oil samples spiked with varying concentrations of AFB₁ were prepared and treated under different operational conditions. Then, the AFB₁ content, acid value, and peroxide value of the decontaminated oils were quantitatively determined to identify the optimal UV wavelength, exposure duration, and intensity for AFB₁ degradation. The system's efficacy was also evaluated using oil pressed from mold-contaminated peanuts. In this study, the 365 nm UV LED cold light showed a higher degradation efficiency than its 254 nm. AFB₁ concentrations in peanut oil progressively decreased with increasing irradiation duration and intensity, achieving over 30% enhancement. Similar effects were observed using peanut oil pressed from mold contaminated peanuts sourced from actual situation. Following UV LED cold light treatment, no significant alterations were noted in the oil's acid value, peroxide value, indicating that the degradation process does not compromise lipid quality. In conclusion, the UV LED cold light system presents a superior, low-cost, and low-heat-loss solution for AFB₁ detoxification in peanut oil, effectively overcoming the drawbacks of conventional thermal UV methods.