Overview
DSPE-PEG-FITC is a synthetic amphiphilic molecule combining a hydrophobic DSPE (1,2-distearoyl-sn-glycero-3-phosphoethanolamine) tail, hydrophilic PEG spacer, and fluorescent FITC (fluorescein isothiocyanate) head. Primarily utilized in life sciences, it enables real-time visualization of lipid-based drug delivery systems and cellular membranes. The PEG segment (typically 1k-5k Da) improves solubility and reduces immunogenicity, while FITC provides green fluorescence detectable by standard microscopy setups. Developed as a research tool in the 1990s, DSPE-PEG-FITC has become indispensable for studying nanoparticle biodistribution and membrane dynamics. Its modular design allows customization of PEG chain lengths to balance stability and clearance rates in biological systems.
Physical and Chemical Properties
The compound exhibits dual solubility: the DSPE moiety anchors into lipid membranes, while PEG-FITC extends into aqueous environments. Fluorescence intensity (quantum yield ~0.5-0.7) depends on pH (optimal at 7.4-8.0) and may photobleach under prolonged illumination. PEG length directly affects hydrodynamic diameter—2k PEG yields ~10 nm micelles, whereas 5k PEG forms ~20 nm structures. Thermogravimetric analysis shows decomposition above 200°C. The FITC component is sensitive to nucleophiles (e.g., amines, thiols), requiring careful handling. In aqueous solutions, critical micelle concentration (CMC) ranges from 1-10 µM, enabling spontaneous self-assembly above this threshold.
Main Applications
1) **Liposome Tracking**: Labels drug-loaded liposomes to monitor tumor accumulation via fluorescence imaging (common in cancer research). 2) **Cell Membrane Studies**: Incorporates into plasma membranes to visualize endocytosis/exocytosis processes. 3) **Nanoparticle Characterization**: Quantifies PEG coating density on gold/silica nanoparticles through fluorescence correlation spectroscopy. In B2B contexts, pharmaceutical companies use it for preclinical formulation development—particularly to optimize stealth properties of nanomedicines. Diagnostic kit manufacturers employ it as a fluorescent tracer in lateral flow assays. Recent advances include multiplexing with near-infrared dyes for dual-mode imaging.
Safety and Storage
Although non-toxic at working concentrations (<0.1 mg/mL), direct contact may cause eye/skin irritation. SDS recommends nitrile gloves and safety goggles. Store lyophilized powder under argon at -20°C; reconstituted solutions remain stable for 1 week at 4°C (add 0.02% sodium azide if prolonged storage is needed). Degradation signs include color change (orange→brown) and fluorescence quenching. For disposal, incinerate or use approved organic waste streams. Shipping typically requires UN2811 (Biological Substance, Category B) classification for international transport.
B2B Procurement Guide
Key specifications to verify: 1) PEG molecular weight (e.g., 2k vs 3.4k Da), 2) FITC conjugation ratio (HPLC-certified), 3) residual solvent levels (should be <1% chloroform). Bulk buyers (>10g) can request custom PEG lengths or maleimide/thiol derivatives for crosslinking applications. Leading suppliers include Avanti Polar Lipids, NOF America, and Nanocs. MOQs typically start at 100mg, with lead times of 2-4 weeks for specialty derivatives. For GMP-grade material (used in clinical-stage products), expect 3-6 month validation processes and 5-10x cost premiums.
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