Sodium Alginate
Synonyms
Algin;
Alginic acid, sodium salt;
Category
Polymer Surfactant
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>> Anionic-type
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Chemical Numbering System
CAS: 9005-38-3
EINECS: N/A
Molecular Formula & Molecular Weight
Molecular Formula: N/A
Molecular Weight: N/A
Structure
Properties
Appearance (1), off-white to pale yellow solid.
Solubility soluble in water.
Stability stable. Under strong acid condition, form alginic acid and separate out.
Risk Solid form: flammable material; irritation, irritation to skin, eye, respiratory system. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
cat intraperitoneal LD50 |
250mg/kg[1] |
|
rabbit intravenous LD50 |
100mg/kg[1] |
|
mouse intraperitoneal LDLo |
500mg/kg[1] |
|
rat oral LD50 |
> 5000mg/kg[1] |
|
rat intraperitoneal LD |
> 1000mg/kg[1] |
|
rat intravenous LD50 |
1000mg/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent film-forming, emulsifying, dispersing, lubricating, sustained-release abilities. With calcium ion, form gel. Polyelectrolyte. Good biocompatibility.
Synthesis
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
90.0 |
Test Methods
(1), Actives
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Product standards
(1), Chinese standards
(1a), GB 1886.243 Food safety national standard -- Food additive -- Sodium Alginate
(1b), YY/T 1654 Tissue engineering medical device products -- Alginate
(1c), Chinese Pharmacopoeia (2015 Edition) Sodium Alginate
4, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
(b), Used in cosmetics, should be test for harmful substances or furtherly test for microorganisms, according to local regulations and standards.
Major Uses
1, Typical applications
Use as film-forming agent.
Use as thickening agent.
Use as slow-release agent.
Use as dispersing agent, emulsifying agent.
Use as adhesive.
Use as suspending agent.
Use as radiation protection agent.
Use as colloidal stabilizer.
2, Personal care products
Binding agent, masking agent, viscosity controlling agent in personal care products.
3, Medicine
Pharmaceutical excipient, use as suspending agent, sustained-release agent. (This section is for reference only, should be implemented according to local Pharmacopoeia.)
4, Food
Use as food additive (thickening agent).
5, Textile
Sizing agent in textile, silk.
6, Paper-making
Sizing agent in paper-making.
7, Biochemistry
Use as biological medium.
8, Water treatment
Flocculant in water treatment.
9, Petroleum
Flocculant in oil field.
10, Powder molding
Adhesive in powder molding.
Manufacturers
References
[1]: ChemIDplus. 9005-38-3, Sodium alginate
Update: 20140911(1); 20200426(2);