Article (Scientific journals)
Hyphenation of capillary zone electrophoresis with mass spectrometry for proteomic analysis: Optimization and comparison of two coupling interfaces
Gou, Marie-Jia; Nys, Gwenaël; COBRAIVILLE, Gaël et al.
2020In Journal of Chromatography. A
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Keywords :
Capillary zone electrophoresis mass spectrometry; Coaxial sheath liquid interface; EMASS-II; Preconcentration; Proteomics; Capillary electrophoresis; Escherichia coli; Ion mobility spectrometers; Liquid chromatography; Liquids; Mass spectrometry; Molecular biology; Nitrogen compounds; Peptides; Capillary zone electrophoresis; Liquid interface; Pre-concentration; Drug products
Abstract :
[en] Capillary electrophoresis tandem mass spectrometry (CE–MS/MS) is an interesting tool for proteomic analysis as the separation principle is orthogonal to liquid chromatography tandem mass spectrometry (LC–MS/MS). The combination of both techniques can bring complementary information to enlarge proteome coverage. In this study, sample preconcentration techniques were investigated in order to improve sample loading and therefore sensitivity. Dynamic pH junction (DPJ) was found to be the most interesting approach by using 200 mM ammonium acetate (NH4Ac) adjusted to pH 10.0 as sample matrix. The use of DPJ allowed the identification of more peptides and proteins compared to conventional injections. Moreover, the sheath liquid (SL) composition was optimized in order to enhance signal intensity. A nanoflow SL interface (EMASS-II) was compared to the traditional coaxial SL interface (Triple tube) in terms of number of identified and proteins as well as detection sensitivity (peak area and peak height). MS acquisition was performed using both data-dependent acquisition (DDA) and data-independent acquisition (DIA) modes. The results showed that the combined use of these two acquisition modes provided additional information in terms of identification. Moreover, the use of EMASS-II interface allowed the identification of approximately two times more peptides and proteins. Besides, there was an improvement in sensitivity using EMASS-II as peak height and peak area were improved by 4 and 6-fold, respectively, compared to the Triple tube. Altogether, by combining an efficient sample preconcentration method, a nanoflow CE–MS interface and a hybrid ion-mobility qTOF mass spectrometer, a satisfying sequence coverage was obtained by analyzing 1 µg of E. coli proteome digest. © 2020
Research center :
CIRM - Centre Interdisciplinaire de Recherche sur le Médicament - ULiège
Disciplines :
Pharmacy, pharmacology & toxicology
Author, co-author :
Gou, Marie-Jia ;  Université de Liège - ULiège > Département de pharmacie > Analyse des médicaments
Nys, Gwenaël ;  Université de Liège - ULiège > CIRM
COBRAIVILLE, Gaël ;  Centre Hospitalier Universitaire de Liège - CHU > Département de médecine interne > Service de rhumatologie
Demelenne, Alice ;  Université de Liège - ULiège > Département de pharmacie > Analyse des médicaments
Servais, Anne-Catherine  ;  Université de Liège - ULiège > Département de pharmacie > Analyse des médicaments
Fillet, Marianne  ;  Université de Liège - ULiège > Département de pharmacie > Analyse des médicaments
Language :
English
Title :
Hyphenation of capillary zone electrophoresis with mass spectrometry for proteomic analysis: Optimization and comparison of two coupling interfaces
Publication date :
2020
Journal title :
Journal of Chromatography. A
ISSN :
0021-9673
eISSN :
1873-3778
Publisher :
Elsevier B.V.
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 March 2020

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