1-Stearoyl-sn-glycero-3-phosphocholine: FAQs & Lab Guide
1-Stearoyl-sn-glycero-3-phosphocholine: FAQs & Lab Guide
1-Stearoyl-sn-glycero-3-phosphocholine is a saturated sn-1 lysophosphatidylcholine bearing an 18-carbon stearoyl acyl chain, widely used as a biochemical reference standard and membrane-model component in lipid research.
- Common Abbreviation
- Lyso-PC 18:0
- Molecular Formula
- C26H54NO7P
- Molecular Weight
- 523.68 g/mol
- Acyl Chain Position
- sn-1 (stearic acid, C18:0)
- Physical Form
- White to off-white powder or waxy solid
- Recommended Storage
- -20 °C, under inert atmosphere, away from light
What Is 1-Stearoyl-sn-glycero-3-phosphocholine?
1-Stearoyl-sn-glycero-3-phosphocholine (Lyso-PC 18:0) is a lysophosphatidylcholine in which a single saturated stearic acid (C18:0) chain is esterified at the sn-1 position of the glycerol backbone, while the sn-2 position remains unoccupied. As a member of the lysophospholipid family, it is both a metabolic intermediate generated by phospholipase A1 activity on diacyl phosphatidylcholines and a bioactive signaling molecule detected in plasma and tissues. Its well-defined, single-acyl structure makes it a valuable reference standard for lipidomics, mass spectrometry method development, and mechanistic studies of lipid–protein interactions.
Key Physicochemical Properties
Lyso-PC 18:0 exists as a white to off-white waxy solid at room temperature with a molecular weight of approximately 523.68 g/mol and the molecular formula C26H54NO7P. Like other lysophosphatidylcholines, it is amphiphilic: the zwitterionic phosphocholine head group confers water compatibility, while the long saturated acyl chain drives hydrophobic self-association. In aqueous media above its critical micelle concentration (CMC), the compound spontaneously forms micelles rather than planar bilayers, a behavior that distinguishes lysophospholipids from their diacyl counterparts. The compound is soluble in chloroform, methanol, and aqueous buffers containing detergent, but has limited solubility in purely aqueous systems at low concentrations.
Note: Specific CMC values and exact solubility figures should be verified against primary literature or supplier certificates of analysis before use in quantitative experiments.
Handling, Storage, and Reconstitution Best Practices
Storage: Store at -20 °C under an inert gas (argon or nitrogen) and protected from light. Repeated freeze-thaw cycles promote hydrolysis and oxidation; therefore, aliquot the material into single-use vials upon receipt.
Reconstitution: Dissolve the compound in chloroform or a chloroform/methanol mixture (e.g., 2:1 v/v) to prepare a concentrated stock. For aqueous working solutions, dry the organic solvent under a gentle nitrogen stream, then re-suspend the lipid film in the desired aqueous buffer with vigorous vortexing or brief bath sonication. Avoid prolonged exposure to open air to minimize oxidation of the ester bond.
Quality checks: Verify purity by TLC or HPLC before critical experiments. Lyso-PC 18:0 is susceptible to acyl migration from the sn-1 to the sn-2 position under mildly acidic or alkaline conditions; confirm regiochemical integrity with 31P-NMR or chiral HPLC if positional purity is critical to your assay.
Research Applications
Lipidomics reference standard: Lyso-PC 18:0 is routinely used as an internal or external standard in LC-MS/MS-based lipidomics workflows due to its well-characterized fragmentation pattern, producing a characteristic phosphocholine head-group ion at m/z 184 in positive-ion mode.
Membrane biophysics: Incorporated into model membranes (supported lipid bilayers, giant unilamellar vesicles), it enables study of how lysophospholipids modulate bilayer curvature, fluidity, and protein function.
Cell biology and signaling: Exogenously added Lyso-PC species have been employed to investigate pro-inflammatory signaling, macrophage activation, and lipid raft dynamics. The 18:0 variant provides a saturated chain control relative to unsaturated Lyso-PC species.
Enzyme activity assays: As a defined substrate or product, Lyso-PC 18:0 supports kinetic studies of phospholipase A1, lysophospholipase, and lysophospholipid acyltransferase enzymes.
Note: Specific experimental parameters and cited results should be confirmed with primary literature before adoption in new assay designs.
Ordering, Purity, and Regulatory Information
SKU: S757518 — 1-Stearoyl-sn-glycero-3-phosphocholine, available from Aladdin Scientific. Please consult the current product page or contact our technical sales team for available pack sizes, current purity specification, and lot-specific certificate of analysis (CoA).
Purity: Research-grade material is typically supplied at ≥98% purity (HPLC). Confirm the exact specification on the CoA accompanying each lot, as values may vary.
Regulatory: This compound is not classified as a controlled substance and is intended for research use only, not for human or veterinary diagnostic or therapeutic use. Standard laboratory safety precautions apply; consult the Safety Data Sheet (SDS) for hazard classification, PPE requirements, and disposal guidance.
Frequently asked questions
What is the difference between 1-Stearoyl-sn-glycero-3-phosphocholine and standard phosphatidylcholine?
Standard phosphatidylcholines carry acyl chains at both the sn-1 and sn-2 positions of the glycerol backbone, forming lamellar bilayers in water. 1-Stearoyl-sn-glycero-3-phosphocholine is a lysophosphatidylcholine with only one acyl chain (C18:0 at sn-1), leaving the sn-2 position free as a hydroxyl group. This structural difference causes it to prefer micellar rather than bilayer self-assembly and confers distinct biological signaling properties not shared by diacyl phosphatidylcholines.
How should I prepare an aqueous solution of 1-Stearoyl-sn-glycero-3-phosphocholine for cell-based assays?
First dissolve the compound in chloroform or chloroform/methanol (2:1 v/v) to make a concentrated stock, then transfer the desired amount to a glass vial and evaporate the solvent under a nitrogen stream to form a thin lipid film. Rehydrate the film in your assay buffer (e.g., PBS) by vortexing and brief bath sonication to obtain a clear micellar suspension. Filter-sterilize through a 0.2 µm membrane if the solution will be added to cell cultures, and use freshly prepared solutions to minimize hydrolysis.
Is acyl migration a concern when working with 1-Stearoyl-sn-glycero-3-phosphocholine?
Yes. Under mildly acidic or alkaline conditions, the stearoyl chain can migrate from the sn-1 position to the sn-2 position, producing the 2-stearoyl regioisomer and diminishing the positional homogeneity of your preparation. To minimize migration, maintain neutral pH, keep solutions cold, and avoid prolonged aqueous incubation. If your experiment depends on strict sn-1 positional purity, confirm regiochemical integrity by 31P-NMR or chiral-phase HPLC before use.
What analytical techniques are recommended for detecting and quantifying Lyso-PC 18:0?
Reversed-phase LC-MS/MS in positive-ion mode is the gold-standard approach, exploiting the diagnostic phosphocholine head-group fragment ion at m/z 184. For routine purity checks, HPLC with an evaporative light-scattering detector (ELSD) or a charged aerosol detector (CAD) is practical. TLC with a phospholipid-specific charring reagent (e.g., molybdenum blue) provides a rapid qualitative screen. Quantification by LC-MS requires a stable-isotope-labeled internal standard for best accuracy.
What are typical research concentrations and how do I avoid cytotoxicity in cell experiments?
Working concentrations of lysophosphatidylcholines in cell-based studies vary widely depending on the biological question, but concentrations above approximately 50–100 µM are frequently reported to induce membrane disruption and cytotoxicity due to detergent-like activity of the lyso-lipid. It is advisable to perform a dose-response experiment starting at sub-micromolar concentrations and to include a viability assay (e.g., MTT or LDH release) at each concentration tested. Note that specific cytotoxicity thresholds depend on cell type, exposure duration, and the presence of serum proteins that can sequester the lipid.
References
- Fahy E, et al. A comprehensive classification system for lipids. J Lipid Res. 2005;46(5):839-861. doi:10.1194/jlr.E400004-JLR200
- Subramaniam S, et al. LIPID MAPS: elucidating the function and regulation of lipid signaling in mammalian cells. Syst Biol (Stevenage). 2006;153(3):166-175.
- Hintze KJ, Benito-Ruiz A. Lysophosphatidylcholine in inflammation and disease. (General textbook-level reference — specific citation to be confirmed.)
Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.
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