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Importance and uses

Brown algae include a number of edible seaweeds. All brown algae contain alginic acid (alginate) in their cell walls, which is extracted commercially and used as an industrial thickening agent in food and for other uses. One of these products is used in lithium-ion batteries. Alginic acid is used as a stable component of a battery anode. This polysaccharide is a major component of brown algae, and is not found in land plants.

Alginic acid can also be used in aquaculture. For example, alginic acid enhances the immune system of rainbow trout. Younger fish are more likely to survive when given a diet with alginic acid.

Brown algae including kelp beds also fix a significant portion of the earth's carbon dioxide yearly through photosynthesis. Additionally, they can store a great amount of carbon dioxide which can help us in the fight against climate change. Sargachromanol G, an extract of Sargassum siliquastrum, has been shown to have anti-inflammatory effects.