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N-Alkylpyridinium sulfonates for retention time indexing in reversed-phase-liquid chromatography-mass spectrometry–based metabolomics.
Anal. Bioanal. Chem., DOI: 10.1007/s00216-021-03828-0 (2021)
Chromatographic retention time information is valuable, orthogonal information to MS and MS/MS data that can be used in metabolite identification. However, while comparison of MS data between different instruments is possible to a certain degree, retention times (RTs) can vary extensively, even when nominally the same phase system is used. Different factors such as column dead volumes, system extra column volume, and gradient dwell volume can influence absolute retention times. Retention time indexing (RTI), routinely employed in gas chromatography (e.g., Kovats index), allows compensation for deviations in experimental conditions. Different systems have been reported for RTI in liquid chromatography, but none of them have been applied to metabolomics to the same extent as they have with GC. Recently, a more universal RTI system has been reported based on a homologous series of N-alkylpyridinium sulfonates (NAPS). These reference standards ionize in both positive and negative ionization modes and are UV-active. We demonstrate the NAPS can be used for retention time indexing in reversed-phase-liquid chromatography-mass spectrometry (RP-LC–MS)–based metabolomics. Having measured >500 metabolite standards and varying flow rate and column dimension, we show that conversion of RT to retention indices (RI) substantially improves comparability of retention information and enables to use of RI for metabolite annotation and identification. [Figure not available: see fulltext.].
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4.142
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Metabolite Annotation ; Metabolomics ; Retention Time Indexing ; Reversed-phase; Identification
Language
english
Publication Year
2021
HGF-reported in Year
2021
ISSN (print) / ISBN
1618-2642
e-ISSN
1618-2650
Publisher
Springer
Publishing Place
Heidelberg
Reviewing status
Peer reviewed
POF-Topic(s)
30203 - Molecular Targets and Therapies
30505 - New Technologies for Biomedical Discoveries
30202 - Environmental Health
30505 - New Technologies for Biomedical Discoveries
30202 - Environmental Health
Research field(s)
Enabling and Novel Technologies
Environmental Sciences
Environmental Sciences
PSP Element(s)
G-505700-001
A-630710-001
G-504800-001
A-630710-001
G-504800-001
Grants
NIH Office of Research Infrastructure Programs
WOS ID
WOS:000730053800003
Scopus ID
85121315854
PubMed ID
34907452
Erfassungsdatum
2021-12-26