Product Overview and Chemical Properties

2-Arachidonoyl-1-stearoyl-sn-glycero-3-phosphocholine (also abbreviated as 18:0/20:4-PC or SAPC) is an asymmetric, mixed-acyl phosphatidylcholine. It bears a saturated stearoyl (C18:0) acyl chain at the sn-1 position and a polyunsaturated arachidonoyl (C20:4, ω-6) acyl chain at the sn-2 position of the glycerophosphocholine backbone. This structural arrangement mirrors one of the most physiologically abundant phosphatidylcholine species found in mammalian cell membranes, particularly in neural and inflammatory tissues.

The phosphocholine head group renders the molecule zwitterionic at physiological pH, contributing to its amphiphilic character. The highly unsaturated arachidonic acid moiety at sn-2 is a well-recognized precursor to eicosanoids and other lipid mediators upon phospholipase A2-mediated hydrolysis, making this compound especially relevant in inflammation and cell signaling research. Aladdin Scientific supplies this compound as a ready-to-use solution (SKU A769857) to facilitate direct use in experimental workflows.

Handling, Storage, and Stability

Due to the presence of four double bonds in the arachidonoyl chain, this phospholipid is susceptible to oxidative degradation. Researchers must take the following precautions to maintain product integrity:

• Storage temperature: Store at −20 °C or below under an inert atmosphere (argon or nitrogen) to minimize oxidation. Avoid repeated freeze-thaw cycles.
• Light sensitivity: Protect from light at all times. Use amber vials or wrap containers in aluminium foil during handling and storage.
• Inert atmosphere: When opening the container, blanket the headspace with argon or nitrogen gas before resealing. Perform aliquoting under inert gas when possible.
• Solvent compatibility: As supplied in solution form, verify the solvent composition from the product datasheet before combining with other reagents or biological matrices.
• Quality check: Prior to critical experiments, assess lipid integrity by thin-layer chromatography (TLC) or LC-MS/MS to confirm the absence of oxidized species or lyso-PC breakdown products.

Improper handling leading to oxidation may introduce artefacts in cell-based assays or mass spectrometry experiments. Always use fresh aliquots for quantitative studies.

Applications in Research

2-Arachidonoyl-1-stearoyl-sn-glycero-3-phosphocholine solution finds utility across multiple research domains:

• Lipidomics and mass spectrometry: Serves as an authentic lipid standard or internal standard (when isotopically labelled analogues are unavailable) for quantification of 18:0/20:4-PC in biological samples by LC-MS/MS or MALDI-TOF.
• Membrane biophysics: Used to reconstitute model lipid bilayers and liposomes that closely mimic mammalian membrane composition, enabling studies of membrane fluidity, domain formation, and protein–lipid interactions.
• Cell biology and signaling: Incorporated into cell membranes or liposomal delivery systems to investigate phospholipase A2 activity, arachidonic acid release, and downstream eicosanoid biosynthesis pathways relevant to inflammation.
• Drug delivery research: Mixed-acyl PCs containing arachidonic acid at sn-2 are explored as components of targeted lipid nanoparticle formulations due to their enzyme-responsive release characteristics.
• Biochemical assays: Substrate for phospholipase activity assays and fatty acid remodelling (Lands cycle) studies.

Quality, Purity, and Regulatory Considerations

Aladdin Scientific's 2-Arachidonoyl-1-stearoyl-sn-glycero-3-phosphocholine solution (SKU A769857) is intended for research use only and is not approved for human or veterinary diagnostic or therapeutic applications. Researchers should consult the Certificate of Analysis (CoA) supplied with each lot for confirmed purity data, concentration, and solvent information before use.

For quantitative lipidomics or pharmacological studies, it is advisable to:

• Request the batch-specific CoA and verify purity by HPLC or NMR as stated therein.
• Confirm the exact concentration of the solution to enable accurate preparation of working standards.
• Store records of lot numbers used in experiments to enable traceability and reproducibility.

This reagent is classified as a research-grade lipid standard. Disposal should comply with local institutional and governmental regulations concerning organic solvent-containing materials.