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Related Experiment Videos

Visible-laser desorption/ionization on gold nanostructures.

L C Chen1, J Yonehama, T Ueda

  • 1Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu 400-8511, Japan.

Journal of Mass Spectrometry : JMS
|January 3, 2007
PubMed
Summary

Visible laser desorption/ionization using gold nanostructures offers a new method for analyzing biomolecules. This technique is effective for low-molecular-weight analytes, overcoming limitations of traditional matrix-assisted laser desorption/ionization mass spectrometry.

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Area of Science:

  • Analytical Chemistry
  • Surface Science
  • Biophysics

Background:

  • Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry is a common technique for analyzing biomolecules.
  • Conventional MALDI can face challenges with certain low-molecular-weight analytes.
  • Nanostructured materials offer unique optical properties for laser-based applications.

Purpose of the Study:

  • To investigate visible-laser desorption/ionization of biomolecules using gold-coated porous silicon and gold nanorod arrays.
  • To evaluate the potential of this technique as an alternative to conventional MALDI for specific analytes.
  • To explore the role of localized surface plasmon resonance in enhancing desorption/ionization efficiency.

Main Methods:

  • Fabrication of gold-coated porous silicon via electrochemical etching and gold sputtering.

Related Experiment Videos

  • Fabrication of gold nanorod arrays using electrodeposition on alumina templates.
  • Irradiation of nanostructured substrates with a frequency-doubled/tripled Nd:YAG laser (532 nm).
  • Mass analysis of desorbed molecular ions using time-of-flight mass spectrometry.

    • Main Results:

    • Visible-laser desorption/ionization was successfully demonstrated on both gold-coated porous silicon and gold nanorod arrays.
    • The use of a 532-nm visible laser, matching the localized surface plasmon resonance of the gold nanostructures, enhanced desorption/ionization.
    • The technique showed promise for analyzing low-molecular-weight analytes that are difficult for conventional MALDI.

    Conclusions:

    • Visible-laser desorption/ionization on gold nanostructured substrates is a viable analytical method.
    • This approach offers a potential solution for analyzing challenging low-molecular-weight biomolecules.
    • The findings suggest a new pathway for mass spectrometry-based biomolecular analysis.