Four-directional-development thin-layer chromatography of lipids using trimethyl borate

Area of Science:

• Lipidomics
• Analytical Chemistry
• Chromatography

Background:

• Thin-layer chromatography (TLC) is crucial for lipid analysis.
• Interconversion of lipid isomers, such as 1,2- and 1,3-dipalmitins, complicates accurate resolution.
• Developing improved TLC methods is essential for precise lipid profiling.

Purpose of the Study:

• To investigate the efficacy of trimethyl borate in solvent mixtures for enhancing lipid separation via TLC.
• To minimize the interconversion of lipid isomers during the chromatographic process.
• To establish a robust TLC procedure for resolving a wide range of neutral and polar lipids.

Main Methods:

• Utilizing solvent mixtures containing trimethyl borate for TLC.
• Employing a four-directional-development TLC procedure on Silica Gel G.
• Applying the developed TLC methods to analyze lipids in human sera.

Main Results:

• Trimethyl borate virtually eliminated the interconversion of 1,2- and 1,3-dipalmitins, with only 1-2% conversion observed.
• A comprehensive range of lipids, including cholesteryl glucoside, ceramides, monopalmitins, dipalmitins, and fatty acids, were resolved.
• The method successfully separated various neutral lipids and demonstrated applicability to human serum lipid analysis.

Conclusions:

• Trimethyl borate is highly effective in preventing lipid isomer interconversion during TLC.
• The developed multi-dimensional TLC procedure offers superior resolution for complex lipid mixtures.
• This optimized TLC technique provides a valuable tool for accurate lipid analysis in biological samples.