Overview
Phospholipid-Polyethylene Glycol-Amine (PL-PEG-NH2) is a synthetic hybrid molecule designed for advanced biomedical applications. It merges the lipid bilayer compatibility of phospholipids with the stealth properties of PEG (polyethylene glycol), terminated by a reactive amine group. This structure enables covalent bonding with targeting ligands, drugs, or imaging agents. The compound is particularly valued in nanomedicine for its ability to prolong circulation time and reduce immunogenicity. Its modular design allows customization of PEG chain lengths (commonly 1k-5k Da) to balance hydrophilicity and steric effects, making it a versatile tool in bioconjugation and nanoparticle engineering.
Physical and Chemical Properties
PL-PEG-NH2 exhibits amphiphilic behavior due to its dual phospholipid (hydrophobic) and PEG (hydrophilic) segments. The amine group (pKa ~8-9) facilitates reactions with carboxyls, NHS esters, or aldehydes under mild conditions. PEGylation significantly enhances water solubility while maintaining lipid membrane affinity. Thermal stability is moderate, with decomposition occurring above 200°C. The compound’s hydrodynamic radius varies with PEG length, influencing its steric shielding capacity. Dynamic light scattering (DLS) and MALDI-TOF are commonly used to characterize its molecular weight distribution and purity.
Main Applications
1. **Drug Delivery**: Modifies liposomes to create long-circulating nanoparticles (e.g., Doxil®-like formulations). The PEG layer reduces opsonization, while the amine group enables antibody conjugation for targeted therapy. 2. **Diagnostics**: Conjugated to fluorescent dyes or MRI contrast agents for bioimaging probes. The phospholipid moiety allows integration into cell membranes or lipid-based carriers. 3. **Tissue Engineering**: Serves as a crosslinker for hydrogel fabrication or surface modifier to enhance biocompatibility of scaffolds. The amine group reacts with ECM components like collagen.
Safety and Storage
PL-PEG-NH2 is generally non-toxic at working concentrations but may cause irritation upon direct contact. Use PPE (gloves, goggles) and work in a fume hood when handling powders. Avoid prolonged exposure to moisture or oxygen to prevent amine oxidation. For long-term storage, aliquot under argon and freeze at -20°C. Solutions in chloroform or DMSO are stable for 6 months when kept anhydrous. Monitor for free amine content via TNBS assay if used for critical conjugations.
B2B Procurement Guide
When sourcing PL-PEG-NH2, prioritize suppliers with cGMP certification for biomedical-grade material. Key specifications include: - **PEG Length**: Match to application (e.g., 2k Da for stealth, 5k Da for enhanced hydration). - **Purity**: >95% by HPLC, with <0.1 EU/mg endotoxin for injectables. - **Batch Consistency**: Request COA with NMR and MS data. Bulk discounts (≥100g) may reduce costs by 20-30%. Consider custom synthesis for specialized PEG/phospholipid ratios. Lead times for high-purity batches typically range from 4-8 weeks.
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