alginic acid
Noun 1. A natural gum derived from brown seaweed: Alginic acid is a polysaccharide (a type of carbohydrate) extracted primarily from the cell walls of brown algae (seaweed). It is valued for its ability to absorb water and form viscous solutions or gels. 2. A thickening, stabilizing, or gelling agent: In industrial and food applications, alginic acid is processed into salts known as alginates. These are used to modify texture, act as emulsifiers to prevent separation, and create gels.
- The laboratory uses alginic acid to create a stable medium for growing certain bacteria.
- Alginic acid is listed as an ingredient in some ice creams to improve texture and prevent ice crystal formation.
- A common application of alginic acid is in the production of alginate dressings for wound care, which maintain a moist healing environment.
- In Pharmaceuticals: Alginic acid is often combined with antacids. In the acidic environment of the stomach, it forms a soothing gel that can help protect the esophagus from acid reflux.
- Example: The medication contains alginic acid to provide a protective barrier against stomach acid.
- Alginate (n): The salt form of alginic acid (e.g., sodium alginate, calcium alginate), which is the functional ingredient commonly used in products.
- Algin (n): A term often used interchangeably with alginic acid or its salts, especially in commercial contexts.
- Seaweed gum
- Algin (in commercial use)
- E400 (when referring to its food additive code in Europe)
The term "alginic acid" specifically refers to the acidic form of the polymer. In practice, it is almost always converted to and used as one of its alginate salts (like sodium alginate), which are more soluble and functional in various applications. Therefore, in ingredient lists, you are more likely to see "sodium alginate" or "algin" rather than "alginic acid."
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a gum used especially as a thickener or emulsifier
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