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Sodium Alginate

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Sodium Alginate

Name:Sodium Alginate
CAS No.:9005-38-3
Appearance:White or pale yellow powder
Molecular formula:C6H9O7Na
Molecular Weight:216.1212
Boiling point:495.2°C at 760 mmHg
Flash point:211.1°C
Vapor Pressure:6.95E-12mmHg at 25°C
Application:Food industry, medicine, printing and textile industry, etc.
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Description:

Sodium alginate is a by-product after the extraction of iodine and mannitol from kelp or Sargasso The uronic acid (α-L-guluronic, G) is connected by the (1→4) bond. The aqueous solution of sodium alginate has a high viscosity and has been used as a food thickener, stabilizer, emulsifier, etc. Sodium alginate is a non-toxic food and has been included in the US Pharmacopoeia as early as 1938. Sodium alginate contains a large amount of -COO-, which can show polyanionic behavior in aqueous solution and has certain adhesiveness, and can be used as a drug carrier for the treatment of mucosal tissue. Under acidic conditions, -COO- is converted into -COOH, the degree of ionization decreases, the hydrophilicity of sodium alginate decreases, the molecular chain shrinks, and when the pH value increases, the -COOH group continuously dissociates, and the hydrophilicity of sodium alginate decreases. The sex increases and the molecular chain stretches. Therefore, sodium alginate has obvious pH sensitivity. Sodium alginate can quickly form a gel under extremely mild conditions. When there are cations such as Ca2+ and Sr2+, Na+ on the G unit undergoes an ion exchange reaction with divalent cations, and the G units are stacked to form a cross-linked network structure. Hydrogels. The mild conditions for sodium alginate gel formation can avoid the inactivation of active substances such as sensitive drugs, proteins, cells and enzymes. Due to these excellent properties, sodium alginate has been widely used in the food industry and medicine.


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