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Acyl migration in 1,2-dipalmitoyl-sn-glycerol
D R Kodali1, A Tercyak, D A Fahey
1Department of Biophysics, Housman Medical Research Center, Boston University School of Medicine, MA 02118-2394.
Chemistry and Physics of Lipids
|February 1, 1990
Summary
The acyl migration of 1,2-dipalmitoyl-sn-glycerol to 1,3-dipalmitoylglycerol was studied. Isomerization rates varied significantly with temperature and solvent, with silica gel and buffer solutions accelerating the process.
Area of Science:
- Lipid chemistry
- Physical chemistry
Background:
- 1,2-dipalmitoyl-sn-glycerol (1,2-DPG) is a key component in biological membranes.
- Understanding its acyl migration is crucial for lipid-based formulations and stability studies.
Purpose of the Study:
- To investigate the acyl migration of 1,2-DPG to 1,3-DPG.
- To quantify isomerization rates under various conditions.
Main Methods:
- Thin-layer chromatography (TLC) with scanning densitometry.
- Controlled temperature and time studies.
- Analysis in neat, lecithin, and silica gel environments.
Main Results:
- Equilibrium favors 1,3-DPG formation (56%).
- Isomerization is significantly faster in polar solvents (e.g., buffer) and on silica gel.
- Half-equilibrium time (t1/2 eq.) varied from <1 hour on silica gel to days in organic solvent.
Conclusions:
- Acyl migration of 1,2-DPG is influenced by the surrounding medium and temperature.
- Polar environments and surfaces like silica gel accelerate the isomerization process.
- Findings are relevant for lipid formulation stability and processing.