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Sodium alginate
As a flavorless gum, it is used by the foods industry to increase viscosity and as an emulsifier. It is also used in indigestion tablets and the preparation of dental impressions.
A major application for sodium alginate is in reactive dye printing, as thickener for reactive dyestuffs (such as the Procion cotton-reactive dyes) in textile screen-printing and carpet jet-printing. Alginates do not react with these dyes and wash out easily, unlike starch-based thickeners.
Sodium alginate is a good chelator for pulling radioactive toxins from the body, such as iodine-131 and strontium-90, that have taken the place of their non-radioactive counterparts. It is also used in immobilizing enzymes by inclusion.
As a food additive, sodium alginate is used especially in the production of gel-like foods. For example, bakers' "Chellies" are often gelled alginate "jam." Also, the pimento stuffing in prepared cocktail olives is usually injected as a slurry at the same time that the stone is ejected; the slurry is subsequently set by immersing the olive in a solution of a calcium salt, which causes rapid gelation by electrostatic cross-linking.A similar process can be used to make "chunks" of everything from cat food through "reformed" ham or fish to "fruit" pieces for pies. It has the E-number 401.
Nowadays, it is also used in the biological experiments for the immobilization of cells to obtain important products like alcohols, organic acids, etc.
Sodium alginate specifications
Item | E401 |
Appearance | Powder |
Color | White |
Taste | Neutral |
Particle size | As customer request |
Viscosity (mpa. s) (1% solution) | As customer request |
Moisture (%) | ≤15.0 |
PH value | 6.0-8.0 |
Ash (%) | 18.0-27.0 |
Water insoluble (%) | ≤2.0 |
As (%) | ≤0.0003 |
Lead (%) | ≤0.0005 |
Content (%) | 90.8-106.0 |
Hg (%) | ≤0.0001 |
Cd (%) | ≤0.0001 |
Total bacteria count (cfu/g) | ≤5000 |
Yeast (cfu/g) | ≤500 |
E.coli | Absent in 5g |
Salmonella | Absent in 10g |
sodium alginate in food