Polyethylene Glycol 1000

Category

Humectants

Molecular Formula

HOCH2(CH2OCH2)nCH2OH，n=20~23.

Grade

Pharmceutical Excipients

Description

Polyethylene glycol as being an addition polymer of ethylene oxide and water. Polyethylene glycol grades 200-600 are liquids; grades 1000 and above are solids at ambient temperatures. Liquid grades (PEG 200-600) occur as clear, colorless or slightly yellow-colored, viscous liquids. They have a slight but characteristic odor and a bitter, slightly burning taste. PEG 600 can occur as a solid at ambient temperatures. Solid grades (PEG>1000) are white or off-white in color, and range in consistency from pastes to waxy flakes. They have a faint, sweet odor. Grades of PEG 6001 and above are available as free flowing milled powders

UNII

U076Q6Q621

Chemical Name

Polyethylene Glycol 1000

CAS Number

25322-68-3

Synonyms

Macrogol 1000

Administration route

Oral; Rectal; Topical; Vaginal; Transdermal

Dosage Form

Solutions, suppositories, creams, gels, aerosol foams

Stability and Storage Conditions

The freezing point is 30~40°C. Store in airtight container.

Commonly used amount and the maximum amount

Generally, the maximum dosage of external preparations is 2mg/g.

Source and Preparation

Polyethylene glycol polymers are formed by the reaction of ethylene oxide and water under pressure in the presence of a catalyst.

Applications

Polyethylene glycols (PEGs) are widely used in a variety of pharmaceutical formulations, including parenteral, topical, ophthalmic, oral, and rectal preparations. Polyethylene glycol has been used experimentally in biodegradable polymeric matrices used in controlled-release systems.

Safety

LD50 (mouse, IP): 20g/kg; LD50 (rat, IP): 15.6g/kg; LD50 (rat, PO): 32g/kg.

Incompatibilities

The chemical reactivity of polyethylene glycols is mainly confined to the two terminal hydroxyl groups, which can be either esterified or etherified. However, all grades can exhibit some oxidizing activity owing to the presence of peroxide impurities and secondary products formed by autoxidation. Liquid and solid polyethylene glycol grades may be incompatible with some coloring agents. The antibacterial activity of certain antibiotics is reduced in polyethylene glycol bases, particularly that of penicillin and bacitracin. The preservative efficacy of the parabens may also be impaired owing to binding with polyethylene glycols. Physical effects caused by polyethylene glycol bases include softening and liquefaction in mixtures with phenol, tannic acid, and salicylic acid. Discoloration of sulfonamides and dithranol can also occur, and sorbitol may be precipitated from mixtures. Plastics, such as polyethylene, phenolformaldehyde, polyvinyl chloride, and cellulose-ester membranes (in filters) may be softened or dissolved by polyethylene glycols. Migration of polyethylene glycol can occur from tablet film coatings, leading to interaction with core components.