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MALDI matrices for biomolecular analysis based on functionalized carbon nanomaterials.

Authors
  • Ugarov, Michael V
  • Egan, T
  • Khabashesku, Dmitry V
  • Schultz, J Albert
  • Peng, Haiqing
  • Khabashesku, Valery N
  • Furutani, Hiroshi
  • Prather, Kimberley S
  • Wang, H-W J
  • Jackson, S N
  • Woods, Amina S
Type
Published Article
Journal
Analytical chemistry
Publication Date
Nov 15, 2004
Volume
76
Issue
22
Pages
6734–6742
Identifiers
PMID: 15538798
Source
Medline
License
Unknown

Abstract

When used in small molar ratios of matrix to analyte, derivatized fullerenes and single wall nanotubes are shown to be efficient matrices for matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. The mixing of an acidic functionalized fullerene with a solution of bioanalyte, depositing a dried droplet, and irradiating with a pulsed nitrogen laser yields protonated or cationized molecular ions. Derivatized fullerenes could offer several advantages over conventional MALDI matrices: a high analyte ionization efficiency, a small molar ratios (less than 1) of matrix/analyte, and a broader optical absorption spectrum, which should obviate specific wavelength lasers for MALDI acquisitions. The major disadvantage to the use of fullerenes is the isobaric interference between matrix and analyte ions; however, it is overcome by using MALDI-ion mobility time-of-flight (IM-oTOF) mass spectrometry to preseparate carbon cluster ions from bioanalyte ions prior to TOF mass analysis. However, an alternative to the dried droplet preparation of fullerene MALDI samples is the aerosolization of matrix-analyte solutions (or slurries) followed by impacting the aerosol onto a stainless surface. We also demonstrate that the fullerene matrices can be used to acquire spectra from rat brain tissue.

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