Separation of Aflatoxin-Contaminated Kernels from Sound Kernels by Hydrogen Peroxide Treatment.

Area of Science:

• Food Science
• Agricultural Chemistry
• Mycotoxicology

Background:

• Aflatoxins are toxic secondary metabolites produced by Aspergillus fungi.
• Contaminated peanuts pose a significant food safety risk.
• Effective methods for reducing aflatoxin contamination in peanuts are crucial.

Purpose of the Study:

• To evaluate the efficacy of hydrogen peroxide treatments in separating aflatoxin-contaminated peanut kernels from sound ones.
• To determine optimal treatment conditions for maximizing the yield of aflatoxin-reduced peanut fractions.
• To assess the degradation of aflatoxins by low concentrations of hydrogen peroxide.

Main Methods:

• Peanut kernel blends were treated with varying concentrations and durations of hydrogen peroxide solutions.
• Separation into floating (floaters) and sinking (sinkers) fractions was performed.
• Aflatoxin analysis was conducted on different kernel fractions.
• Response surface methodology was employed to model and optimize treatment parameters.

Main Results:

• Hydrogen peroxide concentrations of 0.075-0.25% reduced aflatoxin content in the sinker fraction by up to 90% within 1 minute.
• Low hydrogen peroxide concentrations did not significantly degrade aflatoxins.
• Optimal conditions for a 50 ppb aflatoxin peanut sample involved 0.08% hydrogen peroxide for 0.7 minutes.
• This resulted in an 85.5% yield of the sinker fraction with residual aflatoxin content below 5 ppb.

Conclusions:

• Hydrogen peroxide treatment is a viable method for separating aflatoxin-contaminated peanut kernels.
• Optimized treatment parameters can achieve high yields of safe peanut fractions.
• This method offers a promising approach for improving the safety of peanut products.