Figure 4.

Structural motifs of FCSPs (fucoidan) from some brown seaweed species of the order Laminariales and Chordariales. FCSPs of Chorda filum and Laminaria saccharina consist of a poly-α-(1→3)-fucopyranoside backbone with sulfate mainly at C-4 and sometimes at the C-2 position; some of the backbone fucose residues may be acetylated at C-2 (not shown) [24,25]. Cladosiphon okamuranus derived FCSPs also consist of a backbone of α(1→3)-linked-l-fucopyranose residues with sulfate substitutions at C-4 and/or with α(1→2)-linked single α-l-fucopyranosyl substitutions and vicinal glucuronic acid substitutions. Some of the side chain fucose residues may be O-acetylated (not shown) [14].