Sample holder for laser desorption/ionization mass...

Radiant energy – Ionic separation or analysis – With sample supply means

Reexamination Certificate

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Reexamination Certificate

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07019287

ABSTRACT:
Provided are a sample holder for laser desorption/ionization mass spectrometry and a method of manufacturing the sample holder. The sample holder includes a metal plate and a thin layer, which is formed on the metal plate and onto which a sample to be analyzed is loaded. The thin layer is formed of a carbon-based material, such as carbon or graphite. The thin layer is deposited on the metal plate by arc-discharging carbon rods and sputtering carbon atoms emitted from the carbon rods onto the metal plate or by coating the metal plate with a carbon or graphite paste, which is a mixture of carbon or graphite powder and a volatile solvent. Accordingly, it is possible to rule out any possibilities of a matrix or silicon oil having undesirable influences on a mass spectrum of the sample, easily and precisely measure not only a polymer but also a low molecular weight material with a molecular weight of 500 Da or lower, and precisely analyze the mass of the polymer without using an ionization additive, such as salt.

REFERENCES:
patent: 2002/0187312 (2002-12-01), Fonash et al.
patent: 2003/0010908 (2003-01-01), Clark et al.
patent: 2004/0094705 (2004-05-01), Wood et al.
Sunner et al., “Graphite Surface-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry of Peptides and Proteins from Liquid Solutions”,Analytical Chemistry, Dec. 1, 1995, vol. 67, No. 23.
Hie-Joon Kim et al., “Observation of Low Molecular weight Poly(methylsilsesquioxane)s by Graphite Plate Laser Desorption/Ionization Time-of Flight Mass Spectrometry”, Analytical Chemistry, 2000, pp. 5673-5678, vol. 72, No. 22, American Chemical Society, Published on Web Oct. 10, 2000.

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