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• W1858124427 endingPage "1302" @default.
• W1858124427 startingPage "1294" @default.
• W1858124427 abstract "We report substantial in‐situ enrichment of phosphopeptides in peptide mixtures using titanium and zirconium dioxide‐coated matrix assisted laser desorption‐ionization (MALDI) plates prepared by recently reported ambient ion landing deposition technique. The technique was able to modify four common materials currently used for MALDI targets (stainless steel, aluminum, indium‐tin oxide glass and polymeric anchor chip). The structure of the deposited dioxide was investigated by electron microscopy, and different surfaces were compared and discussed in this study. Two standard proteins were used to test the enrichment capabilities of modified MALDI plates: casein and in‐vitro phosphorylated trehalase. The enrichment of casein tryptic digest resulted in identification of 20 phosphopeptides (including miscleavages). Trehalase was used as a suitable model of larger protein that provided more complex peptide mixture after the trypsin digestion. All four possible phosphorylation sites in trehalase were identified and up to seven phosphopetides were found (including methionine oxidations and miscleavages). Two different mass spectrometers, MALDI‐Fourier transform ion cyclotron resonance (FTICR) and MALDI‐time of flight, were used to detect the phosphopeptides from modified MALDI plates after the enrichment procedure. It was observed that the desorption‐ionization phenomena on the modified surfaces are not critically influenced by the parameters of the different MALDI ion sources (e.g. different pressure, different extraction voltages), and thus the presence of dioxide layer on the standard MALDI plate does not significantly interfere with the main MALDI processes. The detection of phosphopeptides after the enrichment could be done by both instruments. Desorption electrospray ionization coupled to the FTICR was also tested, but, unlike MALDI, it did not provide satisfactory results. Copyright © 2012 John Wiley & Sons, Ltd." @default.
• W1858124427 created "2016-06-24" @default.
• W1858124427 creator A5020641974 @default.
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• W1858124427 date "2012-09-27" @default.
• W1858124427 modified "2023-10-02" @default.
• W1858124427 title "<i>In-situ</i>enrichment of phosphopeptides on MALDI plates modified by ambient ion landing" @default.
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• W1858124427 doi "https://doi.org/10.1002/jms.3081" @default.
• W1858124427 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23019160" @default.
• W1858124427 hasPublicationYear "2012" @default.
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