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Sodium Alginate



Sodium alginate is a neutral salt in which the carboxyl groups of alginate are bonded with a sodium ion. Alginic acid is not soluble in water but sodium alginate is soluble in both cold and hot water to produce a smooth viscous solution.

When calcium ions are added to a sodium alginate solution, calcium ions react instantly with alginate to form a gel.
The time taken to form a gel can be controlled by controlling the calcium ions.

These unique properties result in sodium alginate being used as a thickener, gelling agent and stabilizer in a wide range of industries.


Food Applications

  • Thickener

    Sodium alginate is soluble in both cold and hot water and it produces a colloidal solution. The viscosity of this solution is measured by a viscometer.
    Viscosity is affected by the molecular weight of the sodium alginate polymer. Viscosity changes are dependent on the degree of polymerization of the uronic acid units, the molecules which comprise alginic acid. When the molecular weight is high, the viscosity is high even at low concentrations. The viscosity decreases as the molecular weight decreases.

  • Gelling agent

    When contacting a calcium salt with a sodium alginate solution, it forms a gel instantly. By utilizing this function, jelly molded into spherical or spindle-shapes can be created and these are used to make imitation foods such as salmon roe or shark fin.

    1. Before heating
    2. After heating
  • Stabilizer

    By combining the thickening and gelling functions, sodium alginate is used as a stabilizer to maintain the physical properties of foods and increase the commercial value.
    One of the most popular applications is the stabilizing of ice cream. When frozen, ice cream contains a lot of fine bubbles. By adding sodium alginate, it improves overrun and gives a smooth and soft mouthfeel.

  • Major Applications
    • Ice cream
    • Bakery filling
    • Noodles
    • Bakery
    • Sauces
    • Food binding (Onion ring, Olive pimento)
    • Imitation food (Artificial salmon roe, Artificial shark fin)
    • Heat resistance


Alginic acid and its salts are evaluated by JECFA, and ADI (Acceptable Daily Intake) is not specified*.
As sodium alginate is derived from natural seaweed, our products are safe to use and BSE-free, GMO-free and pesticide-residues-free.
*Alginic acid and its salts are regarded as safe materials and they are evaluated as alginic acid in “Group ADI”.

Industrial Use

Sodium alginate is extracted and clarified from natural seaweed. In the industrial area, the major application is textile printing.

Fine Chemical Applications

Highly purified sodium alginate is used for fine chemical applications such as pharmaceuticals and cosmetics. Research using sodium alginate is being conducted in regenerative medicinal fields and many interesting research results are being released.

Functional Material Applications

Sodium alginate is natural dietary fiber. Appropriate intake of sodium alginate improves bowel movements.


Grades of KIMICA’s sodium alginate product are classified by the viscosity of a 1% solution.

Selection Guide (Typical Products)

Food / Pharmaceutical grade


Standard type

Viscosity (1% solution at 20°C)
IL-2 20 - 50 mPa·s
IL-6 40 - 80 mPa·s
I-1 100 - 200 mPa·s
I-3 300 - 400 mPa·s
I-5 500 - 600 mPa·s
I-8 800 - 900 mPa·s

Ultra high viscosity type

LZ-2 1,000 - 1,500 mPa・s

Ultra low viscosity type

Viscosity (10% solution at 20℃)
ULV-L3 20 - 50 mPa·s
ULV-L5 30 - 60 mPa·s
ULV-1 100 - 200 mPa·s
ULV-3 300 - 400 mPa·s
ULV-5 500 - 600 mPa·s

High stiffness gelation type

Viscosity (at 20℃)
ULV-1G 100 - 200 mPa·s(10%)
ULV-5G 300 - 700 mPa·s (10%)
IL-6G 30 - 60 mPa·s (1%)
I-1G 100 - 200 mPa·s (1%)
I-3G 300 - 400 mPa·s (1%)

General purpose industrial grade

KIMITEX - series

Viscosity (1% solution at 20℃)
LL 30 - 60 mPa·s
L 100 - 200 mPa·s
M 300 - 400 mPa·s
H 500 - 600 mPa·s

High purity industrial grade


Viscosity (1% solution at 20℃)
B-1 100 - 200 mPa·s
B-3 300 - 400 mPa·s
B-8 800 - 900 mPa·s

Products listed above are typical grades only and other grades are available.
Appropriate products would be proposed after consultation.


Safety Data Sheet

Under construction

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