DSPE-PEG-Biotin, namely α-Biotin-ω-1,2-distearoyl-sn-glycero-3-phosphoethanolamine-polyethylene glycol (Ammonium Salt), is a functionalized phospholipid-polyethylene glycol (PEG) lipid derivative. This product uses DSPE (distearoylphosphatidylethanolamine) as the lipid anchor structure, connected via a PEG chain to a terminal biotin functional group, combining lipid self-assembly capability, PEG hydrophilic protection, and biotin-specific recognition ability.

DSPE-PEG-Biotin can serve as a functionalized lipid excipient in lipid nanoparticles (LNPs), liposomes, and other nano-delivery systems. By introducing biotin ligands onto the surface of nanocarriers, it enables functional modification of the carriers, offering significant application value in targeted delivery, bioconjugation, and nanomaterial surface modification research.

I. Basic Information

II. Structural Characteristics and Mechanism of Action

1. DSPE Lipid Structure – Providing Membrane Anchoring and Self-Assembly Capability
DSPE consists of two hydrophobic stearic acid chains and a hydrophilic phospholipid head group, exhibiting good membrane fusion properties and self-assembly characteristics.

In LNP or liposome systems, the DSPE structure can stably embed into the lipid bilayer through hydrophobic interactions, enabling DSPE-PEG-Biotin to participate as a functionalized lipid component in nanoparticle construction and display terminal functional groups on the particle surface.

2. PEG Segment – Enhancing Stability and Biocompatibility
The PEG chain serves as a hydrophilic spacer layer, forming a hydration protection layer on the surface of lipid particles, reducing non-specific aggregation between particles, and improving system stability.

Additionally, the PEG chain provides spatial spacing, allowing the terminal biotin groups to be fully exposed, reducing the steric influence of the lipid structure on ligand recognition and facilitating subsequent biomolecule binding.

3. Biotin Functional Group – Enabling Specific Recognition
The terminal biotin possesses high-affinity binding capability with streptavidin/avidin, serving as a molecular recognition tag for functionalized surface modification of lipid nanoparticles.

Through the biotin-avidin system, proteins, antibodies, peptides, and other functional molecules can be further conjugated, providing a connecting platform for targeted delivery and biodetection.

III. Main Applications

1. Functionalization Modification of LNPs and Liposomes
DSPE-PEG-Biotin can serve as a functional lipid in nano-delivery systems such as LNPs and liposomes. Through the DSPE structure embedding into the lipid membrane, biotin is displayed on the particle surface, achieving surface modification of nanocarriers.

2. Targeted Delivery Research
Leveraging the highly specific binding between biotin and streptavidin, DSPE-PEG-Biotin can be used to construct functionalized nanocarriers conjugated with targeting antibodies, peptides, or protein ligands for drug delivery and cell targeting research.

3. Bioconjugation and Molecular Labeling
The biotin group can serve as a universal connecting tag, binding with streptavidin-modified molecules for immobilization, detection, and analysis of proteins, peptides, nucleic acids, and other biomolecules.

4. Nanomaterial Surface Engineering
DSPE-PEG-Biotin can be used for functionalization modification of surfaces such as gold nanoparticles and lipid nanomaterials, improving material stability in biological environments and conferring further conjugation capability.

IV. Related LNP Lipid Products