Quantification of Ara h 1 in peanuts: why roasting makes a difference

Area of Science:

• Food Science
• Allergen Research
• Analytical Chemistry

Background:

• Roasting peanuts increases their allergenicity compared to raw peanuts.
• Higher IgE binding to roasted peanut extracts indicates increased allergen presence.

Purpose of the Study:

• Quantify the effect of roasting on Ara h 1 levels in peanuts.
• Investigate the influence of kernel size and cultivar on Ara h 1 content post-roasting.

Main Methods:

• Utilized monoclonal antibody-based ELISA for Ara h 1 quantification.
• Performed inhibition ELISA to assess epitope accessibility in roasted vs. raw peanuts.
• Analyzed Ara h 1 content in different sized kernels from four runner peanut cultivars.

Main Results:

• Ara h 1 levels were up to 22-fold higher in roasted peanuts compared to raw peanuts.
• The peak increase in Ara h 1 was observed after 10-15 minutes of roasting.
• No significant differences in Ara h 1 levels were found among the four cultivars, but size influenced levels.

Conclusions:

• Roasting enhances Ara h 1 extraction efficiency and/or epitope accessibility.
• The observed increase in Ara h 1 is not due to epitope conformational changes.
• Ara h 1 expression correlates with peanut maturity, influencing allergen levels.