Microbial fermentation as a strategy for the abatement of peanut allergens

Authors: GUZMAN, NADIA - University Of Massachusetts, Amherst; Mattison, Christopher; GIBBONS, JOHN - University Of Massachusetts, Amherst

Submitted to: Applied and Environmental Microbiology
Publication Type: Review Article
Publication Acceptance Date: 3/25/2026
Publication Date: 4/27/2026
Citation: Guzman, N.Y., Mattison, C.P., Gibbons, J.G. 2026. Microbial fermentation as a strategy for the abatement of peanut allergens. Applied and Environmental Microbiology. https://doi.org/10.1128/aem.02497-25.
DOI: https://doi.org/10.1128/aem.02497-25

Interpretive Summary: Peanuts are tasty and nutritious, but they’re also one of the top sources of food allergens in the U.S. Several peanut allergens (called Ara h 1, 2, 3, and 6) are capable of causing severe allergic reactions. There are numerous possible reasons for why these proteins act as allergens, including the observations that they survive cooking and processing steps and are difficult to break down during digestion. To make peanuts safer through processing, scientists have tried various methods, including heating, chemical treatments, and biological processes, to reduce the content and potency of these allergens. One promising approach is fermentation, where food safe microbes break down peanut proteins and produce helpful compounds. This not only lowers allergen levels but can also improve the flavor and nutrition of peanuts. However, creating a truly allergy-friendly peanut or peanut product is still a challenge. Researchers are exploring ways to boost fermentation’s effects, such as adding natural plant compounds that can help change the shape of allergenic proteins and make them easier to break down. This review pulls together insights from biology, chemistry, and computer modeling to explore how scientists have experimented with fermentation with the hope that one day peanuts or peanut products can be enjoyed without the risk of allergic reactions.

Technical Abstract: Although valued for their nutritional content and flavor, peanuts are ranked among the nine major food allergens in the U.S., capable of inducing life-threatening reactions mediated by immunoglobulin E (IgE). Ara h 1, Ara h 2, Ara h 3, and Ara h 6 are recognized as major allergens due to the prevalence and structural stability of their epitopes, which make them resistant to digestion and processing. To address these challenges, processing treatments of different natures have been tested (e.g., physical, chemical, and biological) to reduce allergen content and create safer and more nutritious nuts. Allergen degradation studies discussed in this paper highlight roles of endogenous peanut enzymes and microbial metabolites, as well as computational tools that guide experimental design. Among relevant strategies, fermentation is emphasized for its multifactorial potential, combining the synthesis of bioactive metabolites by generally recognized as safe (GRAS) microbes with their proteolytic and redox activity to reduce allergenicity in peanuts while improving nutritional and sensory quality. Despite significant progress of these approaches, the development of a viable hypoallergenic peanut product remains elusive, even with the potential offered by fermentation. Therefore, potential fermentation enhancers are discussed, such as the addition of polyphenols derived from natural extracts, with the ability to alter allergen conformation and increase enzymatic susceptibility. This review integrates structural insights, physical, chemical, and biological interventions, and computational approaches to provide a comprehensive perspective on peanut allergen reduction. By emphasizing epitope-targeted fermentation and synergistic treatments, we outline directions for developing safer peanut-based foods that balance efficacy, feasibility, and consumer acceptance.