We have developed a new ionization method that uses metal-complex-based ionization probes containing the 2,6-bis(oxazolinyl)pyridine (pybox) ligand, NHS-TMpybox, Mal-TMpybox, BrAc-TMpybox, oxime-TMpybox, and Sar-TMpybox. NHS-TMpybox, Mal-TMpybox, BrAc-TMpybox, and oxime-TMpybox were reacted selectively with the functional groups of biomolecules, whereas Sar-TMpybox was reacted with carbon clusters. These were able to obtain multiply charged ions of target molecules. This method was proven to effectively ionize large complex molecules, including biomolecules and various supramolecules, as well as carbon clusters, such as fullerenes. Moreover, isotope-labeled pybox-La complexes were used to clearly detect isotopic labeling shifts. Their applications to multiply charged ionization, including isotope labeling of biomolecules and carbon clusters using cold-spray ionization mass spectrometry (CSI-MS), are shown.

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Development of a real-time and high-resolution detection system for inspection of trace-level harmful substances at airports or stations is strongly required. A rapid sampling method and vacuum ultraviolet (VUV) light ionization time-of-flight mass spectrometry with high-resolution have been studied to enable 1 s detection. In order to get a high-resolution, the multi-turn type time-of-flight mass spectrometer (TOFMS) was selected. The maximum mass resolution of 6,500 was attained for benzene molecular ion (m/z 78) generated by VUV light photoionization. In order to evaluate sensitivity of the real-time detection, trace-level 2,3-dimethyl-2,3-dinitrobutane (DMNB) and triacetone triperoxide (TATP) on stainless steel sheets were examined. Consequently DMNB was successfully detected within 1 s and the detection limit was 0.04 μg. Also TATP was successfully detected within 1 s and the detection limit was 0.2 μg.

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