Insight into the IgE-binding sites of allergenic peptides of tropomyosin in shrimp (Penaeus chinensis) induced by cold plasma active particles.

Tropomyosin (TM) is a major allergen in crustaceans, and its allergenicity mainly depends on epitopes. In this study, the locations of IgE-binding sites between plasma active particles and allergenic peptides of TM in shrimp (Penaeus chinensis) during cold plasma (CP) treatment were explored. Results showed that the IgE-binding ability of two critical peptides (P1 and P2) increased and then decreased by 9.97 % and 19.50 % after 15 min of CP treatment. It was the first time to show that the contribution rate of target active particles was •O > e (aq) − > •OH for reducing IgE-binding ability by 23.51 %–45.40 %, and the contribution rates of other long-lived particles including NO 3 − and NO 2 − was about 54.60 %–76.49 %. In addition, Glu131 and Arg133 in P1 and Arg255 in P2 were certified as the IgE sites. These results were helpful for accurately controlling TM allergenicity, shedding more light on allergenicity mitigation during food processing. • Cold plasma particles were studied on the IgE-binding ability of peptides. • Target active particle contribution to IgE-binding ability was •O > e (aq) − > •OH. • Glu131 (P1), Arg133 (P1) and Arg255 (P2) were the IgE sites. • Cold plasma was an effective method to reduce the allergenity of TM. [ABSTRACT FROM AUTHOR]