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Matrix Optical Absorption in UV-MALDI MS.

Kenneth N Robinson1,2, Rory T Steven1, Josephine Bunch3,4

  • 1National Center of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Teddington, UK.

Journal of the American Society for Mass Spectrometry
|February 23, 2018
PubMed
Summary
This summary is machine-generated.

This study quantifies the optical absorption of UV-MALDI MS matrix compounds, revealing their impact on laser energy absorption and analyte detection. Findings guide optimized matrix and laser selection for improved experimental results.

Keywords:
AbsorptionFluenceMALDIMatrixUV-MALDIWavelength

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Spectroscopy

Background:

  • Optical absorption of matrix compounds in UV-MALDI MS dictates laser energy uptake and experimental outcomes.
  • Quantitative absorption data for most matrix compounds are scarce.
  • Previous studies on laser energy effects in UV-MALDI MS often focused on single analyte classes.

Purpose of the Study:

  • To report absolute solid-state absorption spectra for five common UV-MALDI MS matrix compounds.
  • To investigate the desorption/ionization characteristics of these matrices with varying laser fluences.
  • To provide insights for optimizing UV-MALDI MS experiments through informed matrix and laser selection.

Main Methods:

  • Measured absolute solid-state absorption spectra of CHCA, PNA, MBT, 2,5-DHB, and THAP.
  • Evaluated desorption/ionization efficiency using mixed matrix-analyte systems (angiotensin II, PC(34:1) lipid, haloperidol).
  • Analyzed the relationship between matrix optical cross-section and laser fluence parameters (threshold, max ion yield, R descriptor).

Main Results:

  • Absolute solid-phase spectra for PNA, MBT, and THAP are reported for the first time.
  • Discrepancies in previously published CHCA spectra were resolved.
  • A minimum matrix cross-section of 1.3 × 10-17 cm-2 was identified as crucial for analyte desorption/ionization.

Conclusions:

  • The study provides essential optical absorption data for key UV-MALDI MS matrices.
  • Understanding matrix optical properties enables optimization of laser fluence and wavelength selection.
  • Established relationships between matrix optical cross-section and desorption/ionization efficiency offer a pathway to improved experimental design.