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Sodium alginate is a natural polysaccharide derived from brown seaweed, primarily used in the pharmaceutical industry as an excipient. It functions as a thickening agent, stabilizer, and emulsifier, helping to improve the texture and consistency of various formulations. Sodium alginate is particularly valued for its ability to form gels in the presence of calcium ions, which is beneficial in drug delivery systems and controlled release formulations.
| Chemical formula | C6H7NaO6 |
| Appearance | White to yellowish powder |
| Solubility | Soluble in water |
| Viscosity | Variable, depending on concentration |
| Molecular weight | Typically 100,000 to 400,000 g/mol |
When selecting sodium alginate, buyers should consider the specific grade required for their application, as different grades may have varying viscosity and gel-forming capabilities. It is also important to specify the desired molecular weight and any relevant certifications, such as food-grade or pharmaceutical-grade, depending on the intended use. Quantities may vary based on production needs, so buyers should provide estimated usage to receive accurate quotes.
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It is used as a thickening agent, stabilizer, and emulsifier in pharmaceuticals and other industries.
Yes, sodium alginate is generally recognized as safe (GRAS) for food applications.
It is extracted from brown seaweed, primarily from species such as Laminaria and Ascophyllum.
Yes, it forms gels in the presence of calcium ions, making it suitable for gel formulations.
It should be stored in a cool, dry place away from moisture and direct sunlight.
Sodium alginate is generally considered hypoallergenic, but individual sensitivities may vary.