Detergent enhancement of on-tissue protein analysis by matrix-assisted laser desorption/ionization imaging mass spectrometry

Rapid Commun Mass Spectrom. 2011 Jan 15;25(1):199-204. doi: 10.1002/rcm.4850.

Abstract

Matrix-Assisted Laser Desorption/Ionization (MALDI) Imaging Mass Spectrometry (IMS) is a molecular technology that allows simultaneous investigation of the content and spatial distribution of molecules within tissue. In this work, we examine different classes of detergents, the anionic sodium dodecyl sulfate (SDS), the nonionic detergents Triton X-100, Tween 20 and Tween 80, and the zwitterionic 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS) for use in MALDI IMS of analytes above m/z 4000. These detergents were found to be compatible with MALDI MS and did not cause signal suppression relative to non-detergent applications and did not produce interfering background signals. In general, these detergents enhanced signal acquisition within the mass range m/z 4-40 000. Adding detergents into the matrix was comparable with the separate application of detergent and matrix. Evaluation of spectra collected from organ-specific regions of a whole mouse pup section showed that different detergents perform optimally with different organs, indicating that detergent selection should be optimized on the specific tissue for maximum gain. These data show the utility of detergents towards enhancement of protein signals for on-tissue MALDI IMS analysis.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain Chemistry
  • Cholic Acids / chemistry
  • Detergents / chemistry*
  • Liver / chemistry
  • Mice
  • Molecular Imaging / methods
  • Myocardium / chemistry
  • Octoxynol / chemistry
  • Polysorbates / chemistry
  • Proteins / chemistry*
  • Sodium Dodecyl Sulfate / chemistry
  • Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / methods*
  • Surface-Active Agents / chemistry*
  • Whole Body Imaging / methods

Substances

  • Cholic Acids
  • Detergents
  • Polysorbates
  • Proteins
  • Surface-Active Agents
  • Sodium Dodecyl Sulfate
  • Octoxynol
  • 3-((3-cholamidopropyl)dimethylammonium)-1-propanesulfonate