Effects of cooking methods on peanut allergenicity

Area of Science:

• Food science
• Allergology
• Comparative nutrition

Background:

• Peanut allergy is a major health concern with lower prevalence in China than the U.S., despite high peanut consumption.
• Chinese peanut preparation commonly involves frying or boiling, unlike the U.S. preference for dry roasting.

Purpose of the Study:

• To investigate if peanut preparation methods influence the differing allergy prevalence rates between China and the U.S.
• To assess the impact of frying, boiling, and roasting on peanut allergenicity.

Main Methods:

• Two U.S. peanut varieties were subjected to roasting, boiling, and frying.
• Proteins were analyzed using SDS-PAGE and immunoblotting.
• Allergenicity was evaluated via immunolabeling with sera from peanut allergy patients.

Main Results:

• Frying and boiling altered peanut protein fractions similarly, reducing the relative amount of Ara h 1.
• IgE-binding intensity was significantly lower in fried and boiled peanuts compared to roasted peanuts.
• Reduced IgE binding to Ara h 2 and Ara h 3 was observed in fried and boiled peanuts, despite similar protein content.

Conclusions:

• Chinese peanut preparation methods (frying, boiling) appear to decrease peanut allergenicity compared to U.S. dry roasting.
• Higher temperatures during roasting may increase peanut protein allergenicity.
• Preparation methods could explain the disparity in peanut allergy prevalence between China and the U.S.