Phospholipids

Phospholipids are the primary structural components of biological membranes. As the most widely used lipids in research, formulation, and drug delivery, they play a crucial role in vaccines and medicinal advancement. 

Built on a glycerophosphate backbone, with variable fatty acid chains and distinct headgroups, each phospholipid has unique physical, biological, and chemical properties. This variability matters, as even a small change can influence membrane behavior, experimental outcomes, and delivery performance.

Avanti Research™ offers an extensive portfolio of research-grade phospholipids across all major headgroup classes. Options include both fully synthetic molecules and naturally sourced extracts, each produced at greater than 99% purity and supported by detailed analytical data. This breadth allows researchers to choose with precision and work with confidence.

Phospholipid classes

Phosphatidylcholine (PC & Lyso PC)

These zwitterionic phospholipids readily form bilayers and are the most prevalent phospholipids in mammalian systems. Because of their stability and predictability, they are often the first choice for liposomes, model membranes, and LNP formulations. Available formats include saturated, unsaturated, mixed-acyl, and natural sources such as egg and soy.

Phosphatidylethanolamine (PE & Lyso PE)

PE lipids introduce curvature into membranes due to their cone-like shape. This property makes them indispensable in processes such as membrane fusion and endosomal escape, particularly in nucleic acid delivery systems. They are also key players in autophagy (LC3 lipidation) and are frequently used in studies of bacterial membranes.

Phosphatidylserine (PS & Lyso PS)

P carries a negative charge, and it is typically found on the inner leaflet of the plasma membrane. When exposed externally, it signals important biological events, including apoptosis, coagulation, and immune signaling. Because of these properties, PS is widely used in neuroscience, immunology, and cell death research.

Phosphatidylglycerol (PG & Lyso PG)

PG is an ionic lipid commonly found in bacterial membranes, mitochondria, and lung surfactant systems, making it valuable for studies involving innate immunity, surfactant research, and respiratory biology. It also serves as a precursor to cardiolipin.

Phosphatidic Acid, Phosphatidylinositol & PIPs (PA, PI, LPA)

PA acts as both a bioactive signaling molecule and a regulator of membrane curvature. PI and its phosphorylated derivatives, such as PIP₂ and PIP₃, manage phosphoinositide signalling cascades that are essential to growth, vesicular trafficking, and cell polarity. These lipids are essential for dissecting complex signaling pathways.

Cardiolipin

This distinctive diphospholipid is found almost exclusively in the inner mitochondrial membrane. It supports the respiratory chain function and is essential in regulating apoptosis. Alterations, disruptions, and deficiencies in cardiolipin are linked to disorders such as Barth syndrome.

Ether lipids, oxidized lipids & specialty classes

This category includes a diverse set of molecules, including plasmalogens, PAF and PAF analogues, oxPAPC, sterol-modified species, and IsoPure positional isomers. These specialized lipids are particularly useful in advanced lipidomics and mechanistic studies.

Research applications

Phospholipids from Avanti Research™ are used across a wide spectrum of scientific disciplines.

Membrane biophysics

Defined lipid systems allow researchers to isolate and study specific membrane properties. Common tools include:

• Liposomes and giant unilamellar vesicles (GUVs)
• Supported bilayers
• Bicelles

These systems help uncover phase behavior, protein interactions, and membrane mechanics.

Drug delivery & LNP formulation

Phospholipids such as PC, PE, PG, and PS are routinely incorporated into LNPs. They provide both structural support and functional enhancement in:

• siRNA delivery
• mRNA therapeutics
• Nucleic acid vaccines

Structural biology

Single-component phospholipids enable controlled environments for membrane protein studies. Applications include:

• Proteoliposomes
• Nanodiscs
• Lipidic mesophases for cryo-EM and X-ray crystallography

Lipidomics

High-purity synthetic and isotopically labeled lipids serve as internal standards in mass spectrometry workflows, improving accuracy in lipid profiling and quantification.

Recent trends in phospholipid research

Interest in phospholipids continues to increase, particularly in therapeutic development. The rapid rise of mRNA technologies has placed renewed focus on PC and PE lipids as key components in delivery systems. Researchers are exploring how subtle differences in acyl chain composition and headgroup chemistry influence particle structure, cellular uptake, and tissue targeting.

At the same time, phosphoinositides are drawing attention for their roles in disease pathways. Molecules such as PI(4,5)P₂ and PI(3,4,5)P₃ are now central to studies in cancer biology, immunology, and neurodegeneration. This has increased demand for highly pure, well-characterized PIP species.

Lipidomics is also evolving. There is a growing need for precise standards, especially positional isomers. In response, Avanti Research™ has expanded its IsoPure line, providing well-defined mixed-acyl phospholipids for advanced analytical workflows.