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Liquid ultraviolet matrix-assisted laser desorption/ionization mass spectrometry for automated proteomic analysis

Cramer, R. and Corless, S. (2005) Liquid ultraviolet matrix-assisted laser desorption/ionization mass spectrometry for automated proteomic analysis. Proteomics, 5 (2). pp. 360-370. ISSN 1615-9853

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To link to this article DOI: 10.1002/pmic.200400956

Abstract/Summary

We have combined several key sample preparation steps for the use of a liquid matrix system to provide high analytical sensitivity in automated ultraviolet - matrix-assisted laser desorption/ ionisation - mass spectrometry (UV-MALDI-MS). This new sample preparation protocol employs a matrix-mixture which is based on the glycerol matrix-mixture described by Sze et al. U. Am. Soc. Mass Spectrom. 1998, 9, 166-174). The low-ferntomole sensitivity that is achievable with this new preparation protocol enables proteomic analysis of protein digests comparable to solid-state matrix systems. For automated data acquisition and analysis, the MALDI performance of this liquid matrix surpasses the conventional solid-state MALDI matrices. Besides the inherent general advantages of liquid samples for automated sample preparation and data acquisition the use of the presented liquid matrix significantly reduces the extent of unspecific ion signals in peptide mass fingerprints compared to typically used solid matrices, such as 2,5-dihydrox-ybenzoic acid (DHB) or alpha-cyano-hydroxycinnamic acid (CHCA). In particular, matrix and lowmass ion signals and ion signals resulting from cation adduct formation are dramatically reduced. Consequently, the confidence level of protein identification by peptide mass mapping of in-solution and in-gel digests is generally higher.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:11163
Uncontrolled Keywords:mass spectrometry, liquid matrix, ultraviolet matrix-assisted laser desorption, ionization , ATMOSPHERIC-PRESSURE MALDI, DESORPTION-IONIZATION, LARGE BIOMOLECULES, INFRARED-LASER, MU-M, FRAGMENTATION, COMPLEXES, DNA, OLIGONUCLEOTIDES, PROTEINS

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