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          Institute: MPI für molekulare Zellbiologie und Genetik     Collection: Publikationen MPI-CBG 2004     Display Documents

ID: 229810.0, MPI für molekulare Zellbiologie und Genetik / Publikationen MPI-CBG 2004
Dried-droplet probe preparation on AnchorChip targets for navigating the acquisition of matrix-assisted laser desorption/ionization time-of-flight spectra by fluorescence of matrix/analyte crystals.
Authors:Thomas, Henrik; Havlis, Jan; Peychl, Jan; Shevchenko, Andrej
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Rapid Communications in Mass Spectrometry
Issue / Number:9
Start Page:923
End Page:930
Copyright:not available
Review Status:not specified
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:We have developed a dried-droplet probe preparation method for peptide mass fingerprinting by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS), which uses AnchorChip targets and alpha-cyano-4-hydroxycinnamic acid (CHCA) as a matrix. Upon drying of a matrix and analyte mixture on the AnchorChip, salts and low molecular weight contaminants were pooled at the hydrophilic metal anchor, whereas 10-50 microm matrix/peptide crystals firmly adhered at the surface of a hydrophobic polymer and the entire target could be subsequently washed by submerging it in 5% formic acid for 2-3 min. Epifluorescence microscopy suggested that peptides were completely co-localized with CHCA crystals at the AnchorChip surface. Fluorescent images of the probes were of good contrast and were background-free, compared with images taken by a video camera built into the ion source. CHCA/peptide crystals were easy to recognize at the surface and peptide mass maps were acquired from them without further adjustment of the position of the laser beam. These crystals were remarkably stable towards the laser depletion and almost no matrix-related ions were typically observed in the low m/z region of peptide mass maps. The sensitivity of the peptide mass mapping was at the low-femtomole level.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für molekulare Zellbiologie und Genetik
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