9005-37-2

Basic information

• Product Name: Propyleneglycol alginate
• Synonyms: 1,2-Propanediol alginate;PROPYLENEGLYCOLALGINATE,HIGHVISCOSITY;PROPYLENEGLYCOLALGINATE,LOWVISCOSITY;PROPYLENEGLYCOLALGINATE,LOWVISCOSITY,FCC;PROPYLENEGLYCOLALGINATE,NF;PROPANE-1,2-DIOLALGINATE;1,2-PROPYLENEGLYCOLALGINATE;Alginate ester’
• CAS NO: 9005-37-2
• Molecular Formula: (C9H14O70n
• Molecular Weight: 0
• Product Categories: stabilizer
• Mol File: 9005-37-2.mol
• Article Data: 0

Chemical Properties

• Boiling Point: 886.32°C (rough estimate)
• Appearance: /
• Density: 1.2096 (rough estimate)
• Refractive Index: 1.7040 (estimate)
• Solubility: Soluble in dilute organic acids and water, forming stable, viscous, colloidal solutions at pH 3. Depending upon the degree of esterification, propylene glycol alginate is also soluble in aqueous ethanol/water mixtures containing up to 60% w/w of ethanol (95%).
• CAS DataBase Reference: Propyleneglycol alginate(CAS DataBase Reference)
• NIST Chemistry Reference: Propyleneglycol alginate(9005-37-2)
• EPA Substance Registry System: Propyleneglycol alginate(9005-37-2)

Safety Data

• Hazardous Substances Data: 9005-37-2(Hazardous Substances Data)

Usage

Description

Propyleneglycol alginate is a gum that is the propylene glycol ester of alginic acid, which is obtained from kelp. It is practically odorless and tasteless, and occurs as a white to yellowish colored, fibrous or granular powder. Compared to sodium alginates, it has reduced sensitivity to acid and calcium salts, and functions in acidic systems.

Uses

Used in Food Industry:
Propyleneglycol alginate is used as a thickener, stabilizer, and emulsifier for various food products such as beer, salad dressings, syrups, and fruit drinks.
Used in Pharmaceutical Industry:
Propyleneglycol alginate is used as a pharmaceutic aid, specifically as a suspending agent and a viscosity-increasing agent. Its reduced sensitivity to acid and calcium salts makes it suitable for use in various pharmaceutical formulations.

Preparation

Derived from brown algae, also from alginic acid

Production Methods

Alginic acid, extracted from brown seaweed, is reacted with propylene oxide to form propylene glycol alginate. Various grades may be obtained that differ in composition according to the degree of esterification and the percentage of free and neutralized carboxyl groups present in the molecule; complete esterification of alginic acid is impractical.

Pharmaceutical Applications

Propylene glycol alginate is used as a stabilizing, suspending, gelling, and emulsifying agent in oral and topical pharmaceutical formulations. Typically, a concentration of 0.3–5% w/v is used, although this may vary depending upon the specific application and the grade of propylene glycol alginate used. Propylene glycol alginate is also used in cosmetics and food products.

Safety Profile

Mddly toxic by ingestion. When heated to decomposition it emits acrid smoke and irritating fumes.

Safety

Propylene glycol alginate is used in oral and topical pharmaceutical formulations, cosmetics, and food products. It is generally regarded as a nontoxic and nonirritant material, although excessive oral consumption may be harmful. A study in five healthy male volunteers fed a daily intake of 175 mg/kg body-weight of propylene glycol alginate for 7 days, followed by a daily intake of 200 mg/kg body-weight of propylene glycol alginate for a further 16 days, showed no significant adverse effects. Inhalation of alginate dust may be 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 seaweed dust rather than pure alginate dust. (hamster, oral): 7.0 g/kg (mouse, oral): 7.8 g/kg (rabbit, oral): 7.6 g/kg (rat, oral): 7.2 g/kg

storage

Propylene glycol alginate is a stable material, although it will gradually become less soluble if stored at elevated temperatures for extended periods. Propylene glycol alginate solutions are most stable at pH 3–6. In alkaline solutions, propylene glycol alginate is rapidly saponified. Alginate solutions are susceptible to microbial spoilage and should be sterilized or preserved with an antimicrobial preservative. However, sterilization processes may adversely affect the viscosity of propylene glycol alginate solutions; see Sodium Alginate.The bulk material should be stored in an airtight container in a cool, dry place.

Regulatory Status

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