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  Exploring the limits and losses in MALDI sample preparation of attomole amounts of peptide mixtures

Nordhoff, E., Lehrach, H., & Gobom, J. (2007). Exploring the limits and losses in MALDI sample preparation of attomole amounts of peptide mixtures. International Journal of Mass Spectrometry, 268(2-3), 139-146. doi:10.1016/j.ijms.2007.07.004.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-810C-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-810D-9
Genre: Journal Article
Alternative Title : Int J Mass Spectrom

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 Creators:
Nordhoff, Eckhard1, Author              
Lehrach, Hans1, Author              
Gobom, Johan1, Author              
Affiliations:
1Dept. of Vertebrate Genomics (Head: Hans Lehrach), Max Planck Institute for Molecular Genetics, Max Planck Society, ou_1433550              

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Free keywords: MALDI-TOF-MS; Peptide; Piezo-electric dispensing; Prestructured sample support; Detection sensitivity
 Abstract: We have used a non-contact piezo-electric liquid dispensing workstation to transfer 200 pL aliquots of both a sample solution containing 12 peptides, each at a concentration of 5 or 50 fmol/μL, and dilution buffer onto microcrystalline spots of α-cyano-4-hydroxycinnamic acid for thin-layer preparations on prestructured MALDI sample supports. This approach allowed us to systematically investigate the dependence of detection sensitivity on sample volume, spot size, concentration, as well as sample losses. We demonstrate that 1 amol of the peptide mixture was sufficient to detect all components if it was prepared in a volume of 0.2 nL across a spot of ca. 180 μm diameter. If the sample was diluted on the target to 200 nL and prepared on a spot of 400 μm diameter, 10 amol could be detected and if the sample volume was increased to 1 μL, 50 amol were required to detect all components. If the peptide mixture instead was diluted in a sample vial and 1 μL of that solution was prepared on a spot of 400 μm diameter, 50 amol of the peptide mixture could be detected as well and the signal-to-noise ratios of the analyte signals were comparable to those observed for the on-target dilution experiment.

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Language(s): eng - English
 Dates: 2007-12-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 335501
DOI: 10.1016/j.ijms.2007.07.004
 Degree: -

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Title: International Journal of Mass Spectrometry
  Alternative Title : Int J Mass Spectrom
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 268 (2-3) Sequence Number: - Start / End Page: 139 - 146 Identifier: ISSN: 1387-3806