Summary of Study ST001493

This data is available at the NIH Common Fund's National Metabolomics Data Repository (NMDR) website, the Metabolomics Workbench, https://www.metabolomicsworkbench.org, where it has been assigned Project ID PR001011. The data can be accessed directly via it's Project DOI: 10.21228/M8111X This work is supported by NIH grant, U2C- DK119886.

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This study contains a large results data set and is not available in the mwTab file. It is only available for download via FTP as data file(s) here.

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Study IDST001493
Study TitleDynamic binning peak detection and assessment of various lipidomics liquid chromatography-mass spectrometry pre-processing platforms
Study SummaryLiquid chromatography-mass spectrometry (LC-MS) based lipidomics generate a large dataset, which requires high-performance data pre-processing tools for their interpretation such as XCMS, mzMine and Progenesis. These pre-processing tools rely heavily on accurate peak detection, which depends on setting the peak detection mass tolerance (PDMT) properly. The PDMT is usually set with a fixed value in either ppm or Da units. However, this fixed value may result in duplicates or missed peak detection. Therefore, we developed the dynamic binning method for accurate peak detection, which takes into account the peak broadening described by well-known physics laws of ion separation and set dynamically the value of PDMT as a function of m/z. Namely, in our method, the PDMT is proportional to for FTICR, to for Orbitrap, to m/z for Q-TOF and is a constant for Quadrupole mass analyzer, respectively. The dynamic binning method was implemented in XCMS. Our further goal was to compare the performance of different lipidomics pre-processing tools to find differential compounds. We have generated set samples with 43 lipids internal standards differentially spiked to aliquots of one human plasma lipid sample using Orbitrap LC-MS/MS. The performance of the various pipelines using aligned parameter sets was quantified by a quality score system which reflects the ability of a pre-processing pipeline to detect differential peaks spiked at various concentration levels. The quality score indicates that the dynamic binning method improves the performance of XCMS (maximum p-value 9.8·10-3 of two-sample Wilcoxon test). The modified XCMS software was further compared with mzMine and Progenesis. The results showed that modified XCMS and Progenesis had a similarly good performance in the aspect of finding differential compounds. In addition, Progenesis shows lower variability as indicated by lower CVs, followed by XCMS and mzMine. The lower variability of Progenesis improve the quantification, however, provide an incorrect quantification abundance order of spiked-in internal standards.
Institute
University of Groningen
Last NamePéter
First NameHorvatovich
AddressAntonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
Emailp.l.horvatovich@rug.nl
Phone+31 (0)50 363 3341
Submit Date2020-09-25
Num Groups6
Total Subjects1
Study CommentsDifferent concentrations of lipid standard mixture were added to the plasma lipid extract aliquots
PublicationsUnder review
Raw Data AvailableYes
Raw Data File Type(s)mzML
Analysis Type DetailLC-MS
Release Date2020-10-13
Release Version1
Horvatovich Péter Horvatovich Péter
https://dx.doi.org/10.21228/M8111X
ftp://www.metabolomicsworkbench.org/Studies/ application/zip

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Combined analysis:

Analysis ID AN002475
Analysis type MS
Chromatography type Reversed phase
Chromatography system Waters Acquity
Column Waters Acquity CSH C18 (100 x 2.1mm,1.7um)
MS Type ESI
MS instrument type Orbitrap
MS instrument name Thermo Q Exactive Orbitrap
Ion Mode POSITIVE
Units Peak area

MS:

MS ID:MS002295
Analysis ID:AN002475
Instrument Name:Thermo Q Exactive Orbitrap
Instrument Type:Orbitrap
MS Type:ESI
MS Comments:The MS was set for positive mode and data-dependent acquisition. A full MS scan the range from 250-1750 Da was acquired at resolution 70,000 FWHM at 200 Da. (AGC target was set to 1·106, maximum injection time was 50 ms, MS1 scan was followed by up to 8 MS/MS events with a collision energy of 25 eV at resolution 17,500 FWHM at 200 Da. The precursor isolation window was set to 1.5 Da with the dynamic exclusion time of 6 s. The ionization settings were as follows: capillary voltage, +3.2 kV; capillary temperature: 320 °C; sheath gas/auxiliary gas: 60/20.
Ion Mode:POSITIVE
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