Overview
Azido-PEG-Hydrazide is a specialized polyethylene glycol derivative engineered for controlled biomolecular conjugation. The azide (-N3) and hydrazide (-CONHNH2) groups enable orthogonal reaction strategies, particularly useful in multi-step bioconjugation workflows. PEG spacers provide water solubility and reduce steric hindrance during reactions. This compound is particularly valuable in pharmaceutical development where precise linker chemistry is required, such as antibody-drug conjugates (ADCs) or targeted drug delivery systems. Its synthesis typically involves multi-step modifications of PEG diols, with final product quality dependent on rigorous purification to minimize mono-functionalized byproducts.
Physical and Chemical Properties
The physical state varies with PEG chain length - shorter chains (MW <1,000) tend to be viscous liquids while longer chains form waxy solids. All variants exhibit excellent water solubility (>100mg/mL) due to PEG's hydrophilic nature, though solubility decreases slightly with increasing molecular weight. Chemically, the azide group reacts efficiently via copper-catalyzed azide-alkyne cycloaddition (CuAAC), while the hydrazide moiety forms stable hydrazone bonds with aldehydes or ketones. The electron-withdrawing PEG backbone slightly increases azide reactivity compared to small molecule azides. Stability studies show <5% degradation after 12 months when stored properly, though azide photolysis may occur under UV exposure.
Main Applications
In drug delivery systems, Azido-PEG-Hydrazide serves as a dual-functional linker to connect targeting ligands (via azide-alkyne click) with drug payloads (via hydrazone linkage). This is particularly useful for pH-sensitive drug release in tumor microenvironments where hydrazone bonds cleave at acidic pH. The compound also enables surface modification of nanomaterials like gold nanoparticles or quantum dots. Researchers functionalize particles with alkyne groups for azide coupling, then use the hydrazide end for subsequent biomolecule attachment. This approach creates stable, oriented protein immobilization platforms for biosensors and diagnostic assays.
Safety and Storage
While PEG itself is biocompatible, the azide group requires careful handling. Never concentrate azide solutions >10% w/v due to explosion risk. Always work in a fume hood when handling powder forms, and use antistatic equipment to prevent electrostatic discharge. For long-term storage, divide bulk material into single-use aliquots under argon atmosphere. Thaw frozen aliquots slowly in a desiccator to prevent moisture absorption. Discard any material showing discoloration (yellow/brown) as this indicates decomposition. SDS sheets typically classify this compound as Hazard Category 2 for acute toxicity (oral).
B2B Procurement Guide
When sourcing Azido-PEG-Hydrazide, prioritize suppliers with ISO 13485 certification for biomedical applications. Key specifications to verify include: azide functionality (>90%), hydrazide content (>85%), residual solvents (<500ppm), and endotoxin levels (<0.1EU/mg for in vivo use). For pilot studies, 100mg-1g quantities are typically sufficient. Bulk purchases (100g+) may qualify for 15-30% discounts but require verification of batch-to-batch consistency. Some manufacturers offer custom PEG lengths (e.g., 3.4kDa) for specific hydrodynamic radius requirements. Always request HPLC and NMR characterization data with each shipment.
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