Overview
Hydroxyl-terminated PEG is a linear or branched polyethylene glycol polymer with hydroxyl (-OH) groups at both ends. It is a crucial building block in polymer chemistry and biomedical applications due to its excellent water solubility, biocompatibility, and ability to be further functionalized. The compound's versatility stems from its tunable molecular weight and the reactivity of its terminal hydroxyl groups, which allow for conjugation with various molecules. It serves as a spacer or linker in bioconjugation and as a modifier in drug delivery systems.
Physical and Chemical Properties
Hydroxyl-terminated PEG exhibits unique physical properties depending on its molecular weight. Low molecular weight variants are typically liquids, while higher molecular weight forms are waxy solids. The compound is highly hygroscopic and readily absorbs moisture from the environment. Chemically, the hydroxyl groups provide sites for further modification through esterification, etherification, or other reactions. PEG's ether backbone gives it exceptional stability against hydrolysis and oxidation, making it suitable for long-term applications in biological systems.
Main Applications
In pharmaceuticals, hydroxyl-terminated PEG is widely used to improve drug solubility, prolong circulation time, and reduce immunogenicity. It's a key component in PEGylated drugs where it's conjugated to therapeutic proteins or small molecules. Beyond medicine, this compound finds use in cosmetics as a moisturizer, in industrial applications as a lubricant or anti-foaming agent, and in research as a surface coating to prevent non-specific binding in bioassays. Its water-soluble nature makes it ideal for creating hydrogels in tissue engineering.
Safety and Storage
While generally recognized as safe, proper handling procedures should be followed. Use personal protective equipment when handling powder forms to prevent inhalation. The material is not considered hazardous but may cause mild eye or skin irritation with prolonged contact. For storage, keep containers tightly sealed in a cool, dry place. Bulk quantities should be protected from moisture absorption and stored under nitrogen when possible. Shelf life is typically 2-3 years when properly stored, though degradation can occur more rapidly in humid environments.
B2B Procurement Guide
When sourcing hydroxyl-terminated PEG, clearly specify required parameters including molecular weight (average and distribution), purity level, and whether linear or branched structure is needed. Pharmaceutical-grade material requires additional documentation and testing. Consider suppliers who provide comprehensive analytical data including NMR and HPLC characterization. For large-volume purchases, request samples to verify performance in your specific application. Lead times may vary significantly based on customization requirements and current market demand.
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