Separation and detection of phosphorylated and nonphosphorylated peptides in liquid chromatography-mass spectrometry using monolithic columns and acidic or alkaline mobile phases.
Identifieur interne : 002E80 ( Main/Exploration ); précédent : 002E79; suivant : 002E81Separation and detection of phosphorylated and nonphosphorylated peptides in liquid chromatography-mass spectrometry using monolithic columns and acidic or alkaline mobile phases.
Auteurs : Andreas Tholey [Allemagne] ; Hansjörg Toll ; Christian G. HuberSource :
- Analytical chemistry [ 0003-2700 ] ; 2005.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Ethylamines, Fluorocarbons, Peptides, Trifluoroacetic Acid.
- instrumentation : Chromatography, Liquid, Mass Spectrometry.
- methods : Chromatography, Liquid, Mass Spectrometry.
- Hydrogen-Ion Concentration.
Abstract
Efficient chromatographic separation is a prerequisite for the sensitive analysis of complex peptide mixtures using liquid chromatography-mass spectrometry. This is especially true for the analysis of mixtures of unmodified and posttranslationally modified peptides, for example, phosphorylated peptides in the presence of their unmodified analogues. Applying monolithic capillary columns based on poly(styrene/divinylbenzene), the influence of acidic eluents based on trifluoroacetic and heptafluorobutyric acid as well as an alkaline eluent based on triethylamine-acetic acid (pH 9.2) on the separation of synthetic phosphopeptides was evaluated. Heptafluorobutyric acid offered the longest retention times and highest selectivities and, hence, the most effective separation. Application of the alkaline eluent in conjunction with detection in negative ion mode electrospray ionization mass spectrometry, on the other hand, allowed the detection of phosphorylated peptides with significantly lower limits of detection, as compared to acidic eluents in combination with detection in positive ion mode. Pairs of phosphorylated and nonphosphorylated synthetic peptides, ranging from 7- to 16-mers, as well as phosphorylated peptides form a tryptic protein digest could be separated both at acidic and alkaline pH. Utilizing a 60 x 0.20-mm-i.d. capillary column, the limit of detection in negative ion detection mode for a 4-fold phosphorylated peptide in a beta-casein digest was 10 fmol. Together with the capability for fast separation of protein digests, monolithic columns, thus, facilitate the effective and sensitive analysis of this important posttranslational modification.
DOI: 10.1021/ac050538t
PubMed: 16013881
Affiliations:
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This is especially true for the analysis of mixtures of unmodified and posttranslationally modified peptides, for example, phosphorylated peptides in the presence of their unmodified analogues. Applying monolithic capillary columns based on poly(styrene/divinylbenzene), the influence of acidic eluents based on trifluoroacetic and heptafluorobutyric acid as well as an alkaline eluent based on triethylamine-acetic acid (pH 9.2) on the separation of synthetic phosphopeptides was evaluated. Heptafluorobutyric acid offered the longest retention times and highest selectivities and, hence, the most effective separation. Application of the alkaline eluent in conjunction with detection in negative ion mode electrospray ionization mass spectrometry, on the other hand, allowed the detection of phosphorylated peptides with significantly lower limits of detection, as compared to acidic eluents in combination with detection in positive ion mode. Pairs of phosphorylated and nonphosphorylated synthetic peptides, ranging from 7- to 16-mers, as well as phosphorylated peptides form a tryptic protein digest could be separated both at acidic and alkaline pH. Utilizing a 60 x 0.20-mm-i.d. capillary column, the limit of detection in negative ion detection mode for a 4-fold phosphorylated peptide in a beta-casein digest was 10 fmol. Together with the capability for fast separation of protein digests, monolithic columns, thus, facilitate the effective and sensitive analysis of this important posttranslational modification.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Sarre (Land)</li></region><settlement><li>Sarrebruck</li></settlement></list><tree><noCountry><name sortKey="Huber, Christian G" sort="Huber, Christian G" uniqKey="Huber C" first="Christian G" last="Huber">Christian G. Huber</name><name sortKey="Toll, Hansjorg" sort="Toll, Hansjorg" uniqKey="Toll H" first="Hansjörg" last="Toll">Hansjörg Toll</name></noCountry><country name="Allemagne"><region name="Sarre (Land)"><name sortKey="Tholey, Andreas" sort="Tholey, Andreas" uniqKey="Tholey A" first="Andreas" last="Tholey">Andreas Tholey</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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