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IR-MALDI ion mobility spectrometry.

José Villatoro1,2,3, Martin Zühlke4, Daniel Riebe4

  • 1Physical Chemistry, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany. jvillato@uni-potsdam.de.

Analytical and Bioanalytical Chemistry
|July 3, 2016
PubMed
Summary
This summary is machine-generated.

Infrared matrix-assisted laser dispersion and ionization (IR-MALDI) coupled with ion mobility (IM) spectrometry enables biomolecule analysis in water. Optimization improved detection limits and dynamic ranges for analyzing mixtures.

Keywords:
IR-MALDIIon mobility spectrometryLaser

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Biochemistry

Background:

  • Investigating biomolecules in aqueous solutions is challenging.
  • Existing methods like electrospray ionization (ESI) have limitations.
  • A novel approach is needed for direct analysis from liquid water.

Purpose of the Study:

  • To develop and optimize infrared matrix-assisted laser dispersion and ionization (IR-MALDI) coupled with ion mobility (IM) spectrometry.
  • To enable the analysis of biomolecules directly from aqueous solutions.
  • To improve the resolution and sensitivity of the IR-MALDI-IM technique.

Main Methods:

  • Implementation of an IR-MALDI source in an in-house ion mobility spectrometer.
  • Utilizing a phase explosion induced by an IR laser pulse (2.94 μm) for ion generation from water.
  • Studying ion desolvation using an additional drift tube and delayed ion extraction.

Main Results:

  • Achieved limits of detection between 5 nM and 2.5 μM.
  • Established linear dynamic ranges of 2-3 orders of magnitude for various substances.
  • Demonstrated the method's capability to separate simple mixtures, such as surfactant mixtures.

Conclusions:

  • IR-MALDI-IM spectrometry is a viable method for analyzing biomolecules in liquid water.
  • Optimized desolvation strategies enhance spectrometer resolution and analytical performance.
  • The technique shows promise for analyzing complex mixtures in their native environment.