Advance workflow in lipoproteomics via polymeric ion exchanger

Area of Science:

• Separation Science
• Analytical Chemistry
• Biochemistry

Background:

• Lipoproteins are crucial biomarkers for various diseases.
• Existing methods for lipoprotein analysis can be complex and time-consuming.
• A need exists for a comprehensive and reproducible workflow for lipoprotein analysis.

Purpose of the Study:

• To develop and validate a novel workflow for the comprehensive analysis of lipoproteins, apoproteins, and lipids from a single serum sample.
• To utilize organic polymeric anion exchangers for efficient lipoprotein enrichment and separation.
• To integrate mass spectrometry techniques for detailed apoprotein and lipid profiling.

Main Methods:

• Synthesis and derivatization of organic polymers (poly(GMA/DVB), poly(GMA/EGDMA), poly(GPE/DVB)) as strong anion exchangers.
• Enrichment of lipoproteins via interaction with phosphate groups on their surface at pH 7.5.
• Isolation of high-density lipoproteins (HDL) by precipitating very low-density lipoproteins (VLDL) and low-density lipoproteins (LDL) using phosphotungstic acid.
• Delipidation using liquid/liquid extraction.
• Apoprotein profiling using Matrix-Assisted Laser Desorption/Ionization-Mass Spectrometry (MALDI-MS).
• Lipid analysis using gold nanoparticles in Laser Desorption/Ionization-Mass Spectrometry (LDI-MS).
• Implementation of a solid-phase extraction (SPE)-based methodology.

Main Results:

• Successful synthesis and application of chemically stable organic polymeric anion exchangers for lipoprotein enrichment.
• Demonstrated effective separation and enrichment of lipoproteins based on their surface charge.
• Achieved detailed apoprotein profiling using MALDI-MS and lipid analysis using LDI-MS from a single serum sample.
• Reported the first solid-phase extraction-based methodology for lipoproteomics.

Conclusions:

• The developed workflow enables comprehensive analysis of intact lipoproteins, apoproteins, and lipids with high reproducibility.
• This lipoproteomics workflow offers significant advantages in terms of efficiency and detail compared to existing methods.
• The workflow holds clinical significance for disease diagnosis and therapeutic monitoring due to the role of lipoproteins as biomarkers.