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Related Experiment Videos

Optimization of a hydrophobic solid-phase extraction interface for matrix-assisted laser desorption/ionization

A H Brockman1, N N Shah, R Orlando

  • 1Department of Biochemistry and Molecular Biology, University of Georgia, Athens 30602-4712, USA.

Journal of Mass Spectrometry : JMS
|December 3, 1998
PubMed
Summary
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Matrix-assisted laser desorption/ionization (MALDI) probe surfaces offer efficient biopolymer isolation. Peptide binding is dependent on immersion time, not concentration, enhancing MALDI technique efficiency.

Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Surface Science

Background:

  • Matrix-assisted laser desorption/ionization (MALDI) is a key technique for analyzing biopolymers.
  • Solid-phase extraction (SPE) is often used for sample preparation in MALDI analysis.
  • Hydrophobic surfaces can be utilized for SPE to isolate and desalt analytes.

Purpose of the Study:

  • To investigate the use of octadecanethiol (C18)-derivatized MALDI probe surfaces as hydrophobic SPE devices.
  • To determine the binding capacity and surface density of peptides on C18-modified probes.
  • To assess the influence of analyte concentration and immersion time on peptide binding.

Main Methods:

  • Derivatization of MALDI probe surfaces with octadecanethiol (C18).
  • Utilizing C18-derivatized probes as hydrophobic SPE devices for biopolymer isolation and desalting.

Related Experiment Videos

  • Employing quantitative MALDI to measure peptide binding and calculate surface density.
  • Varying analyte (peptide) concentrations and immersion times during probe exposure.

    • Main Results:

    • C18-derivatized MALDI probe surfaces effectively isolate and desalt biopolymers.
    • Quantitative MALDI enabled determination of peptide surface density on C18 probes.
    • Peptide binding was found to be independent of analyte concentration (high to sub-ng/mL).
    • Peptide binding was dependent on the immersion time of the probe surface in the analyte solution.

    Conclusions:

    • C18-derivatized MALDI probes function as efficient hydrophobic SPE devices for biopolymer analysis.
    • The fixed binding capacity of these probes simplifies sample preparation by eliminating the need for serial dilution or vacuum drying.
    • This approach significantly increases the overall efficiency and throughput of the MALDI technique.