Seaweed extracts as biostimulants in horticulture

The use of seaweeds has a long history, as does the cultivation of a select and relatively small group of species. This review presents several aspects of seaweed production, such as an update on t...

https://www.tandfonline.com/doi/pdf/10.1080/09670262.2017.1365175

Seaweed production: overview of the global state of exploitation, farming and emerging research activity

Seaweed produces metabolites aiding in the protection against different environmental stresses. These compounds show antiviral, antiprotozoal, antifungal, and antibacterial properties. Macroalgae can be cultured in high volumes and would represent an attractive source of potential compounds useful for unconventional drugs able to control new diseases or multiresistant strains of pathogenic microorganisms. The substances isolated from green, brown and red algae showing potent antimicrobial activity belong to polysaccharides, fatty acids, phlorotannins, pigments, lectins, alkaloids, terpenoids and halogenated compounds. This review presents the major compounds found in macroalga showing antimicrobial activities and their most promising applications.

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Antimicrobial Action of Compounds from Marine Seaweed

Summary Brown algae are rich sources of bioactive compounds such as polysaccharides, peptides, omega-3 fatty acids, carotenoids, phenolics, vitamins and minerals. Laminarin is low-molecular-weight polysaccharide and bioactive compound present in brown algae. Laminarin is found in the fronds of Laminaria and Saccharina species. Laminarin, a storage b-glucan, is composed of (1,3)-b-D-glucan and some b-(1,6)-intrachain links. The reported content of laminarin from brown algae is up to levels of 35% on dry basis, which varies depending on species, harvesting season, habitat and method of extraction. Laminarin has many reported biofunctional activities including antitumour, anti-apoptotic, anti-inflammatory, anticoagulant and antioxidant activity. Biofunctional activities of laminarin can be enhanced after suitable chemical modifications, sulphation and novel processing techniques. Studies on feeding of laminarin-rich extracts to animals indicate it’s suitability as functional ingredient for food applications. This paper reviews the main sources, structure and extraction of laminarin with its biofunctional activities.

Extraction, structure and biofunctional activities of laminarin from brown algae

A review of high value-added molecules production by microalgae in light of the classification.

In vitro antioxidant properties of crude extracts and compounds from brown algae

The biomass components of the invasive seaweed Sargassum muticum were fractionated to allow their separate valorization. S. muticum (Sm) and the solid residue remaining after alginate extraction of this seaweed (AESm) were processed with hot, compressed water (hydrothermal processing) to assess the effects of temperature on fucoidan solubilization. Fucose-containing oligosaccharides were identified as reaction products. Operating under optimal conditions (170 °C), up to 62 and 85 wt% of the dry mass of Sm and AESm were solubilized, respectively. The reaction media were subjected to precipitation, nanofiltration and freeze-drying. The dried products contained 50% and 85% of the fucoidan present in Sm and AESm, respectively; together with other components such as phenolics and inorganic components. The saccharidic fraction, accounting for up to 35% of the dried extracts, contained fucose as the main sugar, and also galactose, xylose, glucose and mannose. The concentrates were characterized for antioxidant activity using the TEAC assay.

https://www.mdpi.com/1660-3397/11/11/4612/pdf

Simultaneous Extraction and Depolymerization of Fucoidan from Sargassum muticum in Aqueous Media

http://diposit.ub.edu/dspace/bitstream/2445/55845/1/641318.pdf

Potential of antioxidant extracts produced by aqueous processing of renewable resources for the formulation of cosmetics

The biorefinery concept integrates processes and technologies for an efficient biomass conversion using all components of a feedstock. Sargassum muticum is an invasive brown algae which could be regarded as a renewable resource susceptible of individual valorization of the constituent fractions into high added-value compounds. Microwave drying technology can be proposed before conventional ethanol extraction of algal biomass, and supercritical fluid extraction with CO2 was useful to extract fucoxanthin and for the fractionation of crude ethanol extracts. Hydrothermal processing is proposed to fractionate the algal biomass and to solubilize the fucoidan and phlorotannin fractions. Membrane technology was proposed to concentrate these fractions and obtain salt- and arsenic-free saccharidic fractions. Based on these technologies, this study presents a multipurpose process to obtain six different products with potential applications for nutraceutical, cosmetic and pharmaceutical industries.

https://www.mdpi.com/1660-3397/13/6/3745/pdf

Valorization of Sargassum muticum Biomass According to the Biorefinery Concept

https://hal.archives-ouvertes.fr/hal-01284826/document

Elena M. Balboa

Papers

In vitro antioxidant properties of crude extracts and compounds from brown algae

Simultaneous Extraction and Depolymerization of Fucoidan from Sargassum muticum in Aqueous Media

Potential of antioxidant extracts produced by aqueous processing of renewable resources for the formulation of cosmetics

Valorization of Sargassum muticum Biomass According to the Biorefinery Concept

Comparative environmental assessment of valorization strategies of the invasive macroalgae Sargassum muticum