Comparative polysaccharides extraction methods ulvans from <i>Ulva ohnoi</i> (<i>Chlorophyta</i>): advantages of microwave-assisted techniques

Macroalgae represent a valuable resource due to their potential applications in various sectors. However, their biomass can sometimes interfere with human activities and contribute to the eutrophication of aquatic environments, as algae often grow uncontrollably. In this study, Ulva ohnoi M.Hiraoka et S.Shimada, a macroalga known for its tendency to produce a high biomass, was chosen, and used as a source of polysaccharides. The objective of this study was to compare different polysaccharide extraction methods to evaluate yield, costs, and potential environmental impact. Data obtained comparing four extraction protocols finalized to determine the most efficient and cost-effective method considering both environmental and economic impacts, show the potentiality of an alternative extraction protocols. The microwave-assisted extraction has the highest yield and lowest energy consumption and solvent methods offering clear environmental benefits. The obtained results indicate that the microwave-assisted extraction method could be used as an alternative to the conventional one for extracting ulvans from U. ohnoi.