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Alginic acid

Alginic acid
Alginic acid structure
Chemical Name:
Alginic acid
Sazio;sazzio;Nopgine;kelacid;norgine;landalgine;Alginic aci;ALGINIC ACID;ALGINICACID,NF;ALGINICACID,FCC
Molecular Formula:
Formula Weight:
MOL File:
Mol file

Alginic acid Properties

Melting point:
300 °C
H2O: insoluble, but swells
White to pale yellow to beige
Water Solubility 
Insoluble in water.
184.1011; 310.545
CAS DataBase Reference
Substances Added to Food (formerly EAFUS)
EWG's Food Scores
EPA Substance Registry System
Alginic acid (9005-32-7)
  • Risk and Safety Statements
Hazard Codes  Xi
Risk Statements  36/37/38
Safety Statements  24/25-36-26
WGK Germany  2
RTECS  AZ5775000
HS Code  39131000

Alginic acid price More Price(9)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich A7003 Alginic acid from brown algae 9005-32-7 100g $48.5 2019-12-02 Buy
Sigma-Aldrich A7003 Alginic acid from brown algae 9005-32-7 1kg $291 2019-12-02 Buy
TCI Chemical A0733 Alginic Acid 9005-32-7 25g $26 2020-06-24 Buy
TCI Chemical A0733 Alginic Acid 9005-32-7 500g $97 2020-06-24 Buy
Alfa Aesar A17582 Alginic acid 9005-32-7 100g $44.2 2020-06-24 Buy

Alginic acid Chemical Properties,Uses,Production

Chemical Properties

Alginic acid is a tasteless, practically odorless, white to yellowishwhite, fibrous powder.

Chemical Properties

Alginic acid found in the walls of brown seaweeds (Phaeophyceae) consists of D-mannuronic acid  units and L-guluronic acid units probably linked β (1->4). The chains contain three distinct regions; in one, the D-mannuronic acid units alternate with L-guluronic acid units, whereas the remaining regions are homogeneous and contain either D-mannuronic acid or L-guluronic acid. The lengths and proportions of the three regions vary with the seaweed species and are responsible for the differences in chemical and physical properties of the various alginates.
Alginic acid is biosynthesised from GDP-D-mannuronic acid and GDP-guluronic acid. It seems probable that guluronic acid is derived from its isomer, mannuronic acid, the re action being catalysed by an epimerase.
D-mannuronic acid or L-guluronic acid
Monovalent salts of alginic acid are soluble in water, but polyvalent salts are either insoluble or form gels. Solutions of alginates are very viscous due to the high molecular weight and random-coil formation of the polymers. The jellying and thickening properties of alginates are widely used commercially in foodstuffs, etc.


Gum derived from alginic acid which is obtained from brown seaweed genera, such as Macrocystis pyrifera. The derivatives are sodium, ammonium, and potassium ates of which the sodium salt is most common. They are used to provide thickening, gelling, and binding. A derivative designed for improved acid and calcium stability is propylene glycol ate. The s are soluble in cold water and form nonthermoreversible gels in reaction with calcium ions and under acidic conditions. Algin is used in ice cream, icings, puddings, dessert gels, and fabricated fruit.


corrosive moisture sensitive


algin (alginic acid) is used in cosmetic formulations as a thickener, stabilizer, and gelling agent. It is obtained from different varieties of brown seaweed.


Alginic Acid is the acidic, insoluble form of algin that is a white to yellowish fibrous powder obtained from brown seaweed genera, such as macrocystis pyrifera. the derivatives are soluble and include sodium, potassium, and ammonium alginate and propylene glycol alginate. it is used as a tablet disintegrant and as an antacid ingredient.


A polysaccharide composed of β,d-mannuronic acid residues linked so that the carboxyl group of each unit is free, while the aldehyde group is shielded by a glycosidic linkage. It is a linear polymer of the mannuronic acid in the pyranose ring form.

Production Methods

Alginic acid is a hydrophilic colloid carbohydrate that occurs naturally in the cell walls and intercellular spaces of various species of brown seaweed (Phaeophyceae). The seaweed occurs widely throughout the world and is harvested, crushed, and treated with dilute alkali to extract the alginic acid.


A yellow-white organic solid that is found in brown algae. It is a complex polysaccharide and produces, in even very dilute solutions, a viscous liquid. Alginic acid has various uses, especially in the food industry as a stabilizer and texture agent.

Pharmaceutical Applications

Alginic acid is used in a variety of oral and topical pharmaceutical formulations. In tablet and capsule formulations, alginic acid is used as both a binder and disintegrating agent at concentrations of 1–5% w/w. Alginic acid is widely used as a thickening and suspending agent in a variety of pastes, creams, and gels; and as a stabilizing agent for oil-in-water emulsions.
Alginic acid has been used to improve the stability of levosimendan.
Therapeutically, alginic acid has been used as an antacid.In combination with an H2-receptor antagonist, it has also been utilized for the management of gastroesophageal reflux.

Safety Profile

Moderately toxic by intraperitoneal route. When heated to decomposition it emits acrid smoke and irritating fumes


Alginic acid is widely used in food products and topical and oral pharmaceutical formulations. It is generally regarded as a nontoxic and nonirritant material, although excessive oral consumption may be harmful. Inhalation of alginate dust may be an irritant and has been associated with industrially related asthma in workers involved in alginate production. However, it appears that the cases of asthma were linked to exposure to unprocessed seaweed dust rather than pure alginate dust. An acceptable daily intake of alginic acid and its ammonium, calcium, potassium, and sodium salts was not set by the WHO because the quantities used, and the background levels in food, did not represent a hazard to health.
LD50 (rat, IP): 1.6 g/kg


Alginic acid hydrolyzes slowly at warm temperatures producing a material with a lower molecular weight and lower dispersion viscosity.
Alginic acid dispersions are susceptible to microbial spoilage on storage, which may result in some depolymerization and hence a decrease in viscosity. Dispersions should therefore be preserved with an antimicrobial preservative such as benzoic acid; potassium sorbate; sodium benzoate; sorbic acid; or paraben. Concentrations of 0.1–0.2% are usually used.
Alginic acid dispersions may be sterilized by autoclaving or filtration through a 0.22 μm filter. Autoclaving may result in a decrease in viscosity which can vary depending upon the nature of any other substances present.
Alginic acid should be stored in a well-closed container in a cool, dry place.

Purification Methods

To 5g of acid in 550mL water containing 2.8g KHCO3 are added 0.3mL of acetic acid and 5g potassium acetate. EtOH is added to make the solution to 25% (v/v) in EtOH, and any insoluble material is discarded. Further addition of EtOH, to 37% (v/v), precipitated alginic acid. Collect the acid and dry it in vacuo. [Pal & Schubert J Am Chem Soc 84 4384 1962.]


Incompatible with strong oxidizing agents; alginic acid forms insoluble salts in the presence of alkaline earth metals and group III metals with the exception of magnesium.

Regulatory Status

GRAS listed. Accepted in Europe for use as a food additive. Included in the FDA Inactive Ingredients Database (ophthalmic preparations, oral capsules, and tablets). Included in the Canadian List of Acceptable Non-medicinal Ingredients. Included in nonparenteral medicines licensed in the UK.

Alginic acid Preparation Products And Raw materials

Raw materials

Preparation Products

Alginic acid Suppliers

Global( 181)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 22625 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 2655 55
career henan chemical co
+86-371-86658258 CHINA 30043 58
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 23977 58
Haihang Industry Co.,Ltd
+86 531 8582 1093 CHINA 10157 58
hdzhl biotechnology co., ltd
86-13032617415 CHINA 1277 58
Chongqing Chemdad Co.,Ltd
+86-19923101450 CHINA 4001 58
Xiamen AmoyChem Co., Ltd
+86 592-605 1114 CHINA 6371 58
Hubei xin bonus chemical co. LTD
027-59338440 CHINA 23045 58
Shandong chuangyingchemical Co., Ltd.
18853181302 CHINA 5917 58

View Lastest Price from Alginic acid manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-24 Alginic acid
US $1.00 / KG 1g 99% 100KG career henan chemical co
2018-12-24 Alginic acid
US $1.00 / kg 1kg 95%-99% 100kg career henan chemical co

Alginic acid Spectrum

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