Figure 2.

¹H NMR spectra of enzymatic extracts of Osmundea pinnatifida obtained by Viscozyme (a) and Sargassum muticum obtained by with Alcalase (b) (the peak at 4.7 ppm indicates the water signal), as well as the relative abundance of each type of proton (c) estimated as the partial integrals of the spectra reported in Figure 2a,b for the enzymatic extracts of seaweeds where H-C: purely alkylic hydrogen atoms; H-C-C=: allylic (H-C_α-C=), carbonyl or imino (H-C_α-C=O or H-C_α-C=N) groups; H-C-O: aliphatic C-H directly bound to an oxygen atom; H-Ar: aromatic hydrogen atoms.