Potential use of Sargassum muticum as source of plant biostimulants after three different drying methods

Abstract Seaweed derived biostimulants are gaining attention as an important tool in sustainable agriculture. This offers a unique opportunity to alleviate the environmental impact of Sargassum muticum (Ochrophyta, Phaeophyceae) invasive species by finding new applications for its biomass. In this sense, incorporating green extraction technologies is fundamental ensure environmental-friendly goals. research was initiated attempt contribute integral valorization system S. biomass, exploring biostimulant potential solubles obtained from pressed solids, through autohydrolysis treatment. addition, we compared effect three different liquid phase drying techniques (spray-drying, freeze-drying and convective air-drying). Low stress spray-drying showed better conservation bioactive compounds potential. A bioassay with Nastrium officinale no phytotoxic effects despite high electric conductivity most extracts concentrations. Dried mainly amorphous structure but occasional crystal formation when spray-dried at low temperatures (T out = 50 ºC) after air 40 ºC). Significant increases root development were achieved concentration 5 mg L −1 case freeze-dried extracts. Munoo-Liisa vitality index best results study provides information about influence on physicochemical properties aqueous contributes