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Poly(2-vinylpyridine) as a reference compound for mass calibration in positive-ion matrix-assisted laser desorption/ionization-mass spectrometry on different instrumental platforms

Butyl-terminated poly(2-vinylpyridine) (P2VP), C4H9(C7H7N)nH, is evaluated for use as an external and internal mass calibrant in positive-ion matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS). P2VP oligomers covering the m/z 450?4500 range are employed to calibrate a time-of-f...

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Bibliographic Details
Main Author: Gross, Jürgen H. (Author)
Format: Article (Journal)
Language:English
Published: 2021
In: European journal of mass spectrometry
Year: 2021, Volume: 27, Issue: 5, Pages: 191-204
ISSN:1751-6838
DOI:10.1177/14690667211055701
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1177/14690667211055701
Verlag, kostenfrei, Volltext: https://journals.sagepub.com/doi/10.1177/14690667211055701
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Author Notes:Jürgen H Gross

MARC

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520 |a Butyl-terminated poly(2-vinylpyridine) (P2VP), C4H9(C7H7N)nH, is evaluated for use as an external and internal mass calibrant in positive-ion matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS). P2VP oligomers covering the m/z 450?4500 range are employed to calibrate a time-of-flight (TOF) mass spectrometer in linear and reflector mode, an ion mobility-quadrupole-time-of-flight (IM-Q-TOF) mass spectrometer, and a Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer. The proton affinity of P2VPs introduced by the numerous pyridyl groups leads to the almost exclusive formation of [M?+?H]+ ions with common acidic matrices like α-cyano-4-hydroxycinnamic acid (CHCA) and 2,5-dihydroxybenzoic acid (DHB) as well as with the non-acidic and aprotic matrices 1,8-dihydroxy-10H-anthracen-9-on (dithranol) and 2-[(2E)-3-(4-tert-butylphenyl)-2-methylprop-2-enylidene]malonitrile (DCTB). This prevalence of [M?+?H]+ ions evenly spaced at ?(m/z)?=?105.0578 renders butyl-terminated P2VP oligomers as convenient mass calibrants. The mass accuracies achieved across various m/z ranges with different mass analyzers and modes of operation are evaluated by using established standard compounds. Results as obtained by internal or external calibration are presented. Further, the compilation of mass reference lists tailored to suit the respective analyzer modes is discussed and those reference files are provided. 
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