Electrospray Ionization and Time-of-Flight Mass Spectrometric Method for Simultaneous Determination of Spermidine and Spermine

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  • Samejima Keijiro
    Research Institute of Pharmaceutical Sciences, Musashino University
  • Otani Masahiro
    Research Institute of Pharmaceutical Sciences, Musashino University
  • Murakami Yasuko
    Research Institute of Pharmaceutical Sciences, Musashino University
  • Oka Takami
    Research Institute of Pharmaceutical Sciences, Musashino University
  • Kasai Misao
    Research Institute of Pharmaceutical Sciences, Musashino University
  • Tsumoto Hiroki
    Research Institute of Pharmaceutical Sciences, Musashino University
  • Kohda Kohfuku
    Research Institute of Pharmaceutical Sciences, Musashino University

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A sensitive method for the determination of polyamines in mammalian cells was described using electrospray ionization and time-of-flight mass spectrometer. This method was 50-fold more sensitive than the previous method using ionspray ionization and quadrupole mass spectrometer. The method employed the partial purification and derivatization of polyamines, but allowed a measurement of multiple samples which contained picomol amounts of polyamines. Time required for data acquisition of one sample was approximately 2 min. The method was successfully applied for the determination of reduced spermidine and spermine contents in cultured cells under the inhibition of aminopropyltransferases. In addition, a new proper internal standard was proposed for the tracer experiment using 15N-labeled polyamines.

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