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Four-dimensional trapped ion mobility spectrometry lipidomics for high throughput clinical profiling of human blood samples

ABSTRACT: Implementation of operational workflows using untargeted high-resolution ion mobility mass spectrometry in clinical lipidomics require reproducible, high-throughput lipid extraction, high-quality lipid annotation, absolute quantification, and cross-validation. We present a high-throughput 4D-PASEF MS platform suitable for clinical plasma lipidomic profiling encompassing automated extraction, accurate lipid annotation, and reproducible quantification. Newly generated 4D-PASEF lipid descriptors (m/z, RT, CCS, MS2) of 200 lipid standards and of 493 lipid signals curated from reference plasma, along with qualification of reproducible features in replicate lipid extracts and dilution analyses enabled highly confident annotation, reaching 100% confidence, of 370 lipids from NIST SRM 1950 plasma and 364 lipids from NIST SRM 1951 serum. 359 plasma lipids were reproducibly quantified using absolute quantification, cross-validated by inter-instrument studies, and supported by inter-laboratory data. The high-throughput 4D-PASEF lipidomics platform was demonstrated by reproducible identification of intra-individual multidien lipidome phenotype in plasma, serum, blood, venous, and finger-prick dried blood spots.

ORGANISM(S): Human Homo Sapiens

TISSUE(S): Blood

SUBMITTER: Laura Bindila

PROVIDER: ST002402 | MetabolomicsWorkbench | Wed Dec 07 00:00:00 GMT 2022

REPOSITORIES: MetabolomicsWorkbench

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Project description:We propose a fully automated novel workflow for lipidomics based on flow injection, followed by liquid chromatography-high-resolution mass spectrometry (FI/LC-HRMS). The workflow combined in-depth characterization of the lipidome achieved via reversed-phase LC-HRMS with absolute quantification by using a large number of lipid species-specific and/or retention time (RT)-matched/class-specific calibrants. The lipidome of 13C-labelled yeast (LILY) provided a large panel of cost-effective internal standards (ISTDs) covering triacylglycerols (TG), steryl esters (SE), free fatty acids (FA), diacylglycerols (DG), sterols (ST), ceramides (Cer), hexosyl ceramides (HexCer), phosphatidylglycerols (PG), phosphatidylethanolamines (PE), phosphatidic acids (PA), cardiolipins (CL), phosphatidylinositols (PI), phosphatidylserines (PS), phosphatidylcholines (PC), lysophosphatidylcholines (LPC) and lysophosphatidylethanolamines (LPE). The workflow in combination with the LILY lipid panel enables simultaneous quantification via (1) external multi-point calibration with internal standardization and (2) internal one-point calibration with LILY as a surrogate ISTD, increasing the coverage while keeping the accuracy and throughput high. Extensive measures on quality control allowed us to rank the calibration strategies and to automatically select the calibration strategy of the highest metrological order for the respective lipid species. Overall, the workflow enabled a streamlined analysis, with a limit of detection in the low femtomolar range, and provided validation tools together with absolute concentration values for >350 lipids in human plasma on a species level. Based on the selected standard panel, lipids from 7 classes (LPC, LPE, PC, PE, PI, DG, TG) passed stringent quality filters, which included QC accuracy, a precision and recovery bias of <30% and concentrations within the 99% confidence interval of the international laboratory comparison of SRM 1950, NIST, USA. The quantitative values are independent of common deuterated or non-endogenous ISTDs, thus offering cross-validation of different lipid methods and further standardizing lipidomics.

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Four-dimensional trapped ion mobility spectrometry lipidomics for high throughput clinical profiling of human blood samples

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