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Atmospheric Pressure Chemical Ionization And Atmospheric Pressure Photoionization For Simultaneous Mass Spectrometric Analysis Of Microbial Respiratory Ubiquinones And Menaquinones.

R. Geyer, A. Peacock, D. C. White, C. Lytle, G. V. Van Berkel
Published 2004 · Chemistry, Medicine

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An atmospheric pressure photoionization (APPI) source and an atmospheric pressure chemical ionization (APCI) source were compared for the selective detection of microbial respiratory ubiquinone and menaquinone isoprenologues using tandem mass spectrometry. Ionization source- and compound mass-dependent parameters were optimized individually for both sources, using the available quinone standards. Detection levels for the two ion sources were determined with ubiquinone-6 (UQ6) and menaquinone-4 (MK4, vitamin K2) standards using flow injection analysis and selected reaction monitoring (SRM). With APPI the calculated lower limit of detection (LLOD) was 1.7 fmol microl(-1) for UQ6 and 2.2 fmol microl(-1) for MK4 at a signal-to-noise ratio of 3. These LLODs were at least three times lower than with APCI. The selectivity of detection afforded by SRM detection reduced complex mixture analysis to 3 min per sample by eliminating the need for chromatographic separations. The detection method was successfully applied to quinone quantification in a variety of environmental samples and cell cultures. Adequate amounts of respiratory quinones can be extracted and quantified from samples containing as low as 2 x 10(7) cells.
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