What does “HSPC” mean, and is it the same as DSPC or PSPC?
“ HSPC” usually refers to hydrogenated soy phosphatidylcholine, a phosphatidylcholine mixture derived from soy and then hydrogenated to make it more saturated and more chemically stable. This makes HSPC behave more like other high-transition-temperature lipids (similar “class” to DSPC/PSPC behavior), but it is not the same as a single, named pure lipid like DSPC.
DSPC is distearoylphosphatidylcholine, and PSPC is soy phosphatidylcholine (often used as a shorthand for different specific commercial mixtures—its exact composition depends on the supplier). HSPC and DSPC/PSPC can be used together in formulations, but they’re distinct raw materials.
Is HSPC hydrogenated soy phosphatidylcholine from Avanti?
Avanti Polar Lipids does sell hydrogenated soy phosphatidylcholine as a catalog lipid (and Avanti also sells DSPC and other phosphatidylcholine lipids). In practice, formulators often use Avanti’s “hydrogenated soy phosphatidylcholine” as HSPC, and then select DSPC or PSPC depending on the desired membrane phase behavior.
How do HSPC, DSPC, and PSPC typically differ in membrane behavior?
In liposome and lipid nanoparticle work, the common reason to choose among these is how their saturation and transition temperature affect bilayer packing and stability:
- DSPC is highly saturated (two stearoyl chains), so it tends to give more rigid, less permeable bilayers and higher thermal transition behavior than unsaturated phosphatidylcholine mixtures.
- HSPC is hydrogenated, so it also trends toward more saturated, higher-transition, more stable membranes than non-hydrogenated soy PC, but its exact behavior reflects the mixture of fatty acyl chains in the “soy” source.
- PSPC (as used in lipid formulations) is generally less saturated than hydrogenated products, so it typically gives more fluid membranes than HSPC/DSPC at the same temperature.
That said, the exact transition temperature and performance depend on the specific product grade and the formulation composition (e.g., cholesterol level, PEG-lipid, and total lipid molar ratios).
What should you check on the label to confirm the exact product?
If you’re trying to match “HSPC” to “dspc pspc avanti,” the critical details are the exact Avanti catalog name and composition specs. Even when two products are both described as “phosphatidylcholine,” small differences in fatty acyl distribution change phase behavior.
Look for:
- Exact product name: “Hydrogenated Soy Phosphatidylcholine” (that’s your HSPC)
- Product catalog number from Avanti
- Fatty acid composition or saturation data in the technical sheet
- Any mention of whether it’s a single species vs a mixture
If you tell me the Avanti catalog numbers, can you map them to HSPC/DSPC/PSPC?
Yes. Share the exact Avanti catalog numbers or the product names you have (even a screenshot text), and I can translate them into which one corresponds to HSPC, which one is DSPC, and which one is PSPC, plus how they’re typically used together in formulations.