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Related Experiment Videos

Direct quantitative analysis of peptides using matrix assisted laser desorption ionization.

A I Gusev1, W R Wilkinson, A Proctor

  • 1Department of Chemistry, University of Pittsburgh, 15260, Pittsburgh, PA, USA.

Analytical and Bioanalytical Chemistry
|February 1, 1996
PubMed
Summary
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This study identifies optimal matrices for quantifying biomolecules using MALDI, achieving high accuracy and linearity. Key findings address matrix saturation to improve quantitative measurements in mass spectrometry.

Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Biochemistry

Background:

  • Accurate quantification of biomolecules is crucial in various scientific fields.
  • Matrix-Assisted Laser Desorption/Ionization (MALDI) mass spectrometry is a powerful technique for biomolecule analysis.
  • Developing robust quantitative protocols for MALDI remains a challenge, particularly concerning matrix effects and signal suppression.

Purpose of the Study:

  • To evaluate different matrices for the quantitative analysis of biomolecules using MALDI mass spectrometry.
  • To determine optimal matrix combinations for achieving high accuracy and linearity in both low and mid-mass ranges.
  • To investigate and mitigate matrix saturation effects impacting quantitative measurements.

Main Methods:

  • Comparative analysis of various matrices, including 2,5-dihydroxybenzoic acid (DHB), ferulic acid, fucose, and 5-methoxysalicylic acid (MSA).

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  • Quantification of biomolecules in low (approx. 1200 amu) and mid (6000-12000 amu) mass ranges using an internal standard.
  • Assessment of standard curve linearity, quantitative limits, and relative error.

    • Main Results:

    • Two matrix combinations, DHB/fucose/MSA and ferulic acid/fucose, demonstrated superior accuracy and standard curve linearity.
    • Quantitative limits were found to be around 30 fmol in the low mass range and 250 fmol in the mid mass range.
    • Matrix saturation, occurring at an analyte/matrix molar ratio of 1/(3000-5000), was identified as a primary challenge, necessitating low internal standard concentrations.

    Conclusions:

    • DHB/fucose/MSA and ferulic acid/fucose matrices provide reliable quantitative analysis of biomolecules via MALDI.
    • Understanding and controlling matrix saturation is essential for accurate quantitative mass spectrometry.
    • The chosen matrices offer good performance even with internal standards of differing chemical properties, provided instrumental parameters are stable.