Specifically, the highest and simultaneously multiply exceeding phenolic content was determined in the brown seaweed Eisenia bicyclis (193 mg·g−1 GAE). Quite high values were also ascertained in the cyanobacterium Spirulina platensis (43 mg·g−1 GAE). On the other hand, brown seaweed products from Undaria pinnatifida (W, Wi) showed absolutely the lowest values among all analyzed samples. From the statistical point of view, one-way ANOVA revealed significant differences among the extraction processes of all algal samples; however, pairwise comparison occasionally disclosed similar
efficiency of phenolic compound extraction methods.