Development and application of a high-resolution imaging mass spectrometer for the study of plant tissues

Katsutoshi Takahashi, Toshiaki Kozuka, Aya Anegawa, Akira Nagatani, Tetsuro Mimura

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry imaging (MSI) or imaging mass spectrometry (imaging MS) has been a powerful tool to map the spatial distribution of molecules on the surface of biological materials. This technique has frequently been applied to animal tissue slices for the purpose of mapping proteins, peptides, lipids, sugars or small metabolites to find disease-specific biomarkers or to study drug metabolism. Recently, it has also been applied to intact plant tissues or thin slices thereof using commercial mass spectrometers. The present work is concerned with the refinement of MALDI/laser desorption/ionization (LDI)-Fourier transform ion cyclotron resonance (FTICR)-MS incorporating certain specific features namely, ultra-high mass resolution (>100,000), ultra-high molecular mass accuracy (<1 p.p.m.) and high spatial resolution (<10 mm) for imaging MS of plant tissues. Employing an in-house built mass spectrometer, the imaging MS analysis of intact Arabidopsis thaliana tissues, namely etiolated seedlings and roots of seedlings, glued to a small transparent ITO (indium tin oxide)-coated conductive glass was performed. A matrix substance was applied to the vacuum-dried intact tissues by sublimation prior to the imaging MS analysis. The images of various small metabolites representing their two-dimensional distribution on the dried intact tissues were obtained with or without different matrix substances. The effects of MALDI matrices on the ionization of small metabolites during imaging MS acquisition are discussed.

Original languageEnglish
Pages (from-to)1329-1338
Number of pages10
JournalPlant and Cell Physiology
Volume56
Issue number7
DOIs
Publication statusPublished - 2015 Jul

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science
  • Cell Biology

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