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Algin, also known as alginic acid, is a colloidal substance derived from marine brown algae. It is a key component of the cell walls of these algae.123

Algin and its salts, called alginates, are used as emulsifiers and thickeners in various products. These substances are polymers of organic acids, such as mannuronic acid and glucuronic acid. Alginates are extracted from brown seaweeds and have applications in food products like ice cream, syrups, and salad dressings to improve texture and consistency. They can also be processed into fibers, known as alginate fibers, which are nonflammable and have diverse uses in textiles.245

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