The Effects of Polyphenolic Impurities in Fucoidan Samples from the Brown Alga Fucus distichus subsp. evanescens (C. Agardh) H.T. Powell, 1957 on the Embryogenesis in the Sea Urchin Strongylocentrotus intermedius (A. Agassiz, 1864) and on the Embryotoxic Action of Cucumarioside

The effects of polyphenolic impurities on the biological activity of fucoidan samples from the brown alga Fucus distichus subsp. evanescens were studied using the model of developing embryos of the sea urchin Strongylocentrotus intermedius. The embryotoxic action of fucophloretol from F. evanescens (IC₅₀ = 96.90 ± 12.20 μmol/L) and cucumarioside A₇ (a triterpene glycoside) from Cucumaria frondosa subsp. japonica (IC₅₀ = 0.39 ± 0.01 μmol/L) was assessed. The ability of fucoidans with different levels of polyphenolic impurities to partially or completely reduce the embryotoxic action of cucumarioside A₇ from C. japonica has been shown. [ABSTRACT FROM AUTHOR]