Journal
JOURNAL OF ANALYTICAL CHEMISTRY
Volume 69, Issue 14, Pages 1351-1355Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1061934814140032
Keywords
graphite-assisted laser desorption/ionization; GALDI mass spectrometry; thin-layer chromatography; graphite; pharmaceutical substances; N-heterocyclic compounds
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Funding
- Program for Basic Research of the Presidium of the Russian Academy of Sciences [9]
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The potentials of using a graphite matrix for laser desorption/ionization from a thin-layer chromatography (TLC) spot is studied. Using a series of pharmaceutical substances with various functional groups and synthetic N-heterocyclic compounds, it was shown that the simple application of graphite onto TLC spots (outlining contour of the spots and shading the spots with a pencil lead) ensured the efficient desorption/ionization of analytes. In most of cases, the recorded mass spectra revealed only [M + Na](+) and [M + K](+) ion peaks, doublets of which can be used to determine molecular masses. The appearance of [M + H](+) ion peaks in some mass spectra may be due to the presence of mineral acids in the samples. The described approach to the application of the matrix onto analyte spots eliminates the danger of spot blurring by a solution or an organic matrix, simplifies the procedure, and shortens the time of sample preparation.
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