Alginic acid CAS 9005-32-7
Introduction：Basic information about Alginic acid CAS 9005-32-7, including its chemical name, molecular formula, synonyms, physicochemical properties, and safety information, etc.
Alginic acid Basic information
| Product Name: | Alginic acid |
| Synonyms: | ALGINIC ACID;kelacid;landalgine;norgine;polymannuronicacid;sazzio;Alginic acid ammonium;Alginic acid from brown algae, AR |
| CAS: | 9005-32-7 |
| MF: | (C6H8O6)n |
| MW: | 0 |
| EINECS: | 232-680-1 |
| Product Categories: | |
| Mol File: | Mol File |
Alginic acid Chemical Properties
| Melting point | 300 °C |
| storage temp. | Room Temperature |
| solubility | H2O: insoluble, but swells |
| form | Powder |
| color | White to pale yellow to beige |
| Odor | wh. to yel. fibrous powd., odorless, tasteless |
| Optical Rotation | -141～-146 |
| Water Solubility | Insoluble in water. |
| Sensitive | Hygroscopic |
| Merck | 14,242 |
| Major Application | diagnostic assay manufacturing hematology histology |
| Cosmetics Ingredients Functions | VISCOSITY CONTROLLING BINDING SKIN CONDITIONING |
| Cosmetic Ingredient Review (CIR) | Alginic acid (9005-32-7) |
| LogP | -3.203 (est) |
| CAS DataBase Reference | 9005-32-7 |
| EPA Substance Registry System | Alginic acid (9005-32-7) |
Safety Information
| Hazard Codes | Xi |
| Risk Statements | 36/37/38 |
| Safety Statements | 24/25-36-26 |
| WGK Germany | 2 |
| RTECS | AZ5775000 |
| F | 3 |
| TSCA | TSCA listed |
| HS Code | 39131000 |
| Storage Class | 11 - Combustible Solids |
| Hazardous Substances Data | 9005-32-7(Hazardous Substances Data) |
| 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. 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. |
| Uses | corrosive moisture sensitive |
| Uses | algin (alginic acid) is used in cosmetic formulations as a thickener, stabilizer, and gelling agent. It is obtained from different varieties of brown seaweed. |
| Uses | 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. |
| Uses | 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. |
| Production Methods | Alginic acid is a hydrophilic colloid carbohydrate that occursnaturally in the cell walls and intercellular spaces of various speciesof brown seaweed (Phaeophyceae). The seaweed occurs widelythroughout the world and is harvested, crushed, and treated withdilute alkali to extract the alginic acid. |
| Definition | 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. |
| Definition | A yellow-white organic solidthat is found in brown algae. It is a complexpolysaccharide and produces, in evenvery dilute solutions, a viscous liquid. Alginicacid has various uses, especially in thefood industry as a stabilizer and textureagent. |
| Pharmaceutical Applications | Alginic acid is used in a variety of oral and topical pharmaceuticalformulations. In tablet and capsule formulations, alginic acid is usedas both a binder and disintegrating agent at concentrations of 1–5%w/w. Alginic acid is widely used as a thickening and suspendingagent in a variety of pastes, creams, and gels; and as a stabilizingagent for oil-in-water emulsions. Alginic acid has been used to improve the stability oflevosimendan. Therapeutically, alginic acid has been used as an antacid.Incombination with an H2-receptor antagonist, it has also beenutilized for the management of gastroesophageal reflux. |
| Safety Profile | Moderately toxic by intraperitoneal route. When heated to decomposition it emits acrid smoke and irritating fumes |
| Safety | Alginic acid is widely used in food products and topical and oralpharmaceutical formulations. It is generally regarded as a nontoxicand nonirritant material, although excessive oral consumption maybe harmful. Inhalation of alginate dust may be an irritant and hasbeen associated with industrially related asthma in workersinvolved in alginate production. However, it appears that the casesof asthma were linked to exposure to unprocessed seaweed dustrather than pure alginate dust. An acceptable daily intake ofalginic acid and its ammonium, calcium, potassium, and sodiumsalts was not set by the WHO because the quantities used, and thebackground levels in food, did not represent a hazard to health. LD50 (rat, IP): 1.6 g/kg |
| storage | Alginic acid hydrolyzes slowly at warm temperatures producing amaterial with a lower molecular weight and lower dispersionviscosity. Alginic acid dispersions are susceptible to microbial spoilage onstorage, which may result in some depolymerization and hence adecrease in viscosity. Dispersions should therefore be preserved withan antimicrobial preservative such as benzoic acid; potassiumsorbate; sodium benzoate; sorbic acid; or paraben. Concentrationsof 0.1–0.2% are usually used. Alginic acid dispersions may be sterilized by autoclaving orfiltration through a 0.22 μm filter. Autoclaving may result in adecrease in viscosity which can vary depending upon the nature ofany 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.] |
| Incompatibilities | Incompatible with strong oxidizing agents; alginic acid formsinsoluble salts in the presence of alkaline earth metals and group IIImetals 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 (ophthalmicpreparations, oral capsules, and tablets). Included in the CanadianList of Acceptable Non-medicinal Ingredients. Included in nonparenteralmedicines licensed in the UK. |
Alginic acid Preparation Products And Raw materials
| Raw materials | Sodium alginate-->KASSOU-->Calcium Alginate |
| Preparation Products | Sodium alginate-->Propyleneglycol alginate-->Calcium Alginate-->Alginic Sodium Diester |
