Tandem time-of-flight (TOF/TOF) mass spectrometry and the curved-field reflectron

Robert J. Cotter, Wendell Griffith, Christine Jelinek

Research output: Contribution to journalReview articlepeer-review

Abstract

The curved-field reflectron (CFR), when used as the second mass analyzer in a tandem time-of-flight mass spectrometer, provides a design that enables the use of very high energy collision-induced dissociation (CID). Specifically, this is because the wide energy bandwidth of the CFR obviates the need for floating the collision region to decelerate the precursor ions and subsequently reaccelerating product ions to enable reflectron focusing. Here we describe the evolution of tandem instruments based on the CFR, from its introduction in 1993 to the current commercial TOF2 mass spectrometer from Shimadzu Corporation, and briefly review the history of TOF/TOF instruments. A number of applications are also described. One is the characterization of a C-terminal cleavage of cystatin C that appears to be associated with patients with remitting relapse multiple sclerosis (RRMS). Both surface-enhanced laser desorption/ionization (SELDI) and MALDI were used on a high performance TOF instrument operating in the MS and MS/MS modes. Tandem TOF mass spectrometry has also been used to determine the acetylation sites on histones and on the enzyme, histone acetyl transferase (HAT), responsible for the modification. Acetylation has been determined quantitatively for multiple sites on histone H3 and H4 using a deuteroacetylation method. For a number of closely spaced sites on the histone tail regions, MS/MS enables us to then determine both the order and distribution of acetylation.

Original languageEnglish (US)
Pages (from-to)2-13
Number of pages12
JournalJournal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences
Volume855
Issue number1 SPEC. ISS.
DOIs
StatePublished - Aug 1 2007

Keywords

  • Acetylation
  • Curved-field reflectron
  • Cystatin
  • Histone acetyl transferase (HAT)
  • Histones
  • Matrix-assisted laser desorption/ionization (MALDI)
  • Multiple sclerosis
  • Surface-enhanced laser desorption/ionization (SELDI)
  • Tandem mass spectrometry
  • Time-of-flight

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Clinical Biochemistry
  • Cell Biology

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