Antiallergic properties of edible brown seaweeds harvested at the coast of Nishinoshima Town, Shimane Prefecture, after a removal of astringency

Abstract

We demonstrated the antiallergic effect of Ecklonia cava Subsp. stolonifera harvested on the coast of Nishinoshima Town and the active compounds (phlorotannins)¹⁾. Moreover, the chemical changes of the phlorotannins were found in a dried powder manufacturing²⁾. In this study, we investigated an antiallergic effect of the alga after a removal of phlorotannin. After boiling for approximately 10 h, the treated alga was pulverized using a mill and 80% methanol (80M) extract was obtained from the algal powder. The amount of phlorotannins in the 80M extract was measured using Folin-Denis method. Regarding the extract, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and antiallergic property was investigated. Phlorotannins were not detected in the 80M extract. However, the extract exhibited the DPPH radical scavenging activity and antiallergic property. Therefore, this study suggests an existence of antiallergic components different from phlorotannins. 1) Sugiura, Y. et al., Algal Res., 58, 102398, 2021. 2) Sugiura, Y. et al., Food Sci. Technol. Res., 30, 261, 2024.