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Reversed phase LC/MS/MS method for targeted quantification of glycerophospholipid molecular species in plasma
Olaf Uhl1, Claudia Glaser, Hans Demmelmair
1Division of Metabolic and Nutritional Medicine, Dr. von Hauner Children's Hospital, University of Munich, Medical Center, Munich, Germany.
Insights
This study presents a new method for analyzing infant plasma glycerophospholipids (GPs) using minimal blood volume. The technique accurately quantifies key lipid species, crucial for understanding infant development and health.
Area of Science:
- Biochemistry
- Clinical Chemistry
- Pediatric Research
Background:
- Lipid metabolism is vital for infant development, yet specific glycerophospholipid (GP) roles remain understudied.
- Existing methods often require large plasma volumes, limiting infant sample analysis.
Purpose of the Study:
- To develop and validate a quantitative method for analyzing plasma glycerophospholipid species from small infant blood samples.
- To enable detailed investigation into the impact of specific lipid profiles on infant health and development.
Main Methods:
- Developed a rapid sample preparation technique involving methanol protein precipitation.
- Utilized reversed-phase High-Performance Liquid Chromatography (HPLC) coupled with Electrospray Ionization-Tandem Mass Spectrometry (ESI-MS/MS).
- Quantified phosphatidylcholine (PC), lysophosphatidylcholine (lyso-PC), phosphatidylethanolamine (PE), and lysophosphatidylethanolamine (lyso-PE) species.
Main Results:
- The method demonstrated a linear working range from 0.05 to 10 μmol/L with low intra-assay variability (1.1%–13.9%).
- Results showed good agreement with existing databases and gas chromatography methods.
- Successfully quantified all major PE and PC species, including isobaric compounds.
Conclusions:
- The developed HPLC-MS/MS method is reliable and efficient for quantifying plasma glycerophospholipids in infants using small sample volumes.
- This technique facilitates research into dietary influences and the health implications of specific lipid profiles in early life.
- Enables deeper understanding of infant metabolism and development through detailed lipidomic analysis.
Abstract:
The relationship between lipid status and metabolism, infant development and health has widely been studied, but the importance of individual glycerophospholipid species for biological functions in infants has hardly been considered. We developed a method for quantitative analyses of plasma glycerophospholipids from small sample volume. Proteins were precipitated with methanol, which eliminated further sample preparation. The supernatant was analysed by reversed-phase HPLC using a gradient of water, methanol and isopropanol as mobile phase. Electrospray ionisation in negative mode in combination with tandem mass spectrometry enabled detection of specific fatty acids as fragments of glycerophospholipid species. With this combination of chromatography and mass spectrometry, PC, lyso-PC, PE and lyso-PE species and their relevant isobaric compounds were quantified. Method validation showed a linear working range between 0.05 μmol/L and 10 μmol/L in diluted plasma samples. The intra-assay coefficients of variation (n=6) ranged from 1.1% to 13.9%. Results were comparable with data of the human metabolome database and gas chromatographic fatty acid analyses. All quantitatively important PE and PC species are covered. The method can be applied for investigating dietary effects on plasma GP composition from small plasma volumes.
