E401 Algin Sodium Alginate

What is Algin Sodium Alginate?

Algin Sodium Alginate, also called sodium alginate, is a natural polysaccharide extracted from brown algae. The aqueous solution of sodium alginate has a high viscosity and is used as a thickener, stabilizer, emulsifier, etc. in the food industry, pharmaceuticals and other industries.

E401 Algin Sodium Alginate

Category E Number CAS No. HS Code Origin MOQ
Thickeners, Stabilizers
100 kg
E401 Algin Sodium Alginate Table of Contents

Our Sodium Alginate Grades

We offer you various grades of sodium alginate, including food grade sodium alginate, pharmaceutical grade, printing and dyeing textile grade, papermaking grade, etc.

Meanwhile, in order to fully meet the various needs of our customers, the mesh size, viscosity, gel strength, including packaging style and material of our sodium alginate are all available on request.

Algin Sodium Alginate Source

Brown algae, including Laminaria, Scagassum, Maerocystis, and Ascophyllum nodosum.

Sodium Alginate Production Process

The production process of algin sodium alginate is as follows.

Dried or wet seaweed (algae) is crushed, washed to remove impurities, extracted with strong alkaline water and clarified to obtain crude alginate solution.
By calcium chloride precipitation to get the colorful calcium alginate.
After decolorization, deodorization and acid treatment to remove soluble impurities to obtain alginate precipitation.
With sodium carbonate to obtain sodium alginate.
Then dried, crushed and sieved to get sodium alginate powder.

Sodium Alginate Specification



Chemical: name Sodium salt of alginic acid

Chemical formula: (C 6 H 7 NaO 6 ) n

Molecular weight: 10 000-600 000 (typical average)

Assay: Yields, on the anhydrous basis, not less than 18 % and not more than 21 % of carbon dioxide corresponding to not less than 90,8 % and not more than 106,0 % of sodium alginate (calculated on equivalent weight basis of 222)


Nearly odourless, white to yellowish fibrous or granular powder


Test for sodium: Passes test

Test for alginic acid: Passes test


Loss on drying: Not more than 15 % (105 °C, 4 hours)

Water insoluble matter: Not more than 2 % on the anhydrous basis

Formaldehyde: Not more than 50 mg/kg

Arsenic: Not more than 3 mg/kg

Lead: Not more than 5 mg/kg

Mercury: Not more than 1 mg/kg

Cadmium: Not more than 1 mg/kg

Microbiological criteria

Total plate count: Not more than 5 000 colonies per gram

Yeast and moulds: Not more than 500 colonies per gram

Escherichia coli: Absent in 5 g

Salmonella spp.: Absent in 10 g

Is Algin Sodium Alginate Safe?

In the U.S.

In the U.S., Algin sodium alginate is a non-toxic food and was included in the U.S. Pharmacopoeia as early as 1938.
Sodium alginate is generally recognized as safe (GRAS) as designated by the FDA.
It is a designation that a specific substance or ingredient is generally considered safe by experts, and so is exempted from the usual Federal Food, Drug, and Cosmetic Act (FFDCA) food additive tolerance requirements. Sodium alginate is perfectly safe for using as food additives.

In the EU

Sodium alginate is a high-molecular-weight polymer naturally occurring in brown algae.
The additive is intended to be used as a technological additive (functional groups: thickeners and gelling agents).
The use of sodium alginate in animal nutrition is considered safe for the consumers and the environment.
From EFSA.

In China

In China, the quality standard of sodium alginate is GB1886.243-2016.

It was shown that the intake of high concentrations of sodium alginate for 23 consecutive days had no effects other than those usually associated with polysaccharide bulking agents;

in particular, sensitive indicators of enzymatic and other adverse toxicological effects remained unchanged.

We focus our main attention on various kinds of high-quality Hydrocolloids and Stabilizing systems.

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