Overview of Liposome-Based Delivery
Liposomes are spherical lipid bilayer vesicles that serve as highly effective delivery vehicles for a wide range of biomolecules, including nucleic acids and proteins. Due to their ability to encapsulate both hydrophilic and hydrophobic agents, liposomes are widely used in gene therapy, RNA interference studies, protein delivery, and vaccine development. Encapsulation protects sensitive biological materials from enzymatic degradation, enables cellular uptake, and improves biodistribution. This service provides precision encapsulation of siRNA, miRNA, plasmid DNA, and functional proteins into customizable liposomal carriers.
Lipid Formulation and Vesicle Engineering
Each encapsulation process begins with the selection of optimal lipid compositions tailored to the cargo’s physicochemical properties. Lipid mixtures may include phosphatidylcholine, cholesterol, PEGylated lipids, and cationic or ionizable lipids to enhance stability, cellular uptake, and circulation time. Particle size and surface charge are carefully controlled through extrusion or microfluidic mixing, producing uniform liposomes with diameters typically ranging from 50 to 200 nm. These parameters are adjusted depending on the desired biodistribution, target cell type, and administration route.
Nucleic Acid Encapsulation (siRNA, miRNA, Plasmid DNA)
Nucleic acid payloads are encapsulated using electrostatic complexation, hydration of dried lipid films, or ethanol injection methods, depending on the sensitivity and structural requirements of the cargo. siRNA and miRNA duplexes benefit from protection against serum nucleases and improved cellular delivery via endocytosis-facilitated uptake. For plasmid DNA, cationic liposomes enable nuclear translocation and high-efficiency gene expression. All formulations are screened for encapsulation efficiency, polydispersity index, zeta potential, and stability in biologically relevant conditions.
Protein and Enzyme Delivery
Protein encapsulation into liposomes supports intracellular delivery of enzymes, therapeutic antibodies, and other functional proteins that are otherwise degraded or excluded by cellular membranes. Encapsulation can occur in the aqueous core for soluble proteins or within the lipid bilayer for hydrophobic domains. Controlled-release properties can be engineered by modulating lipid composition or surface modifications. Protein integrity is assessed post-encapsulation using SDS-PAGE, functional activity assays, and enzyme kinetics measurements.
Customization and Targeted Delivery
Surface-functionalized liposomes can be conjugated with ligands such as peptides, antibodies, or aptamers to enable receptor-mediated targeting of specific cell types or tissues. PEGylation is used to prolong systemic circulation and reduce immune recognition. These features are essential for therapeutic delivery to tumors, hepatocytes, immune cells, or neurons. Optional fluorescence labeling of lipids allows for in vitro and in vivo tracking using microscopy or live-animal imaging systems.
Analytical Characterization and Stability Testing
Each liposome formulation is rigorously analyzed using dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), transmission electron microscopy (TEM), and encapsulation quantification via UV-Vis or fluorometric assays. Stability studies are performed at multiple temperatures and storage conditions to assess aggregation, leakage, and functional retention. Batch reproducibility and sterility are ensured for preclinical studies and IND-enabling toxicology programs.
Altogen Labs Liposome Encapsulation Capabilities
Altogen Labs offers comprehensive liposome encapsulation services designed for preclinical research, therapeutic development, and functional studies. Their capabilities include the formulation of nucleic acid-loaded liposomes, protein carriers, and custom-designed vesicles for targeted delivery applications. With end-to-end support, including formulation development, characterization, and biological validation, these services enable efficient delivery strategies for both in vitro and in vivo studies.