Recently, Shen Chengyin, an associate researcher at the Institute of Spectroscopy and Mass Spectrometry, Center for Medical Physics and Physics at the Hefei Institute of Material Science, Chinese Academy of Sciences, made progress in the on-line mass spectrometry detection of organic compounds. The new bipolar proton transfer reaction mass spectrometry (DP-PTR-MS) Technology, through positive and negative ions coordinated detection, can improve the identification of organic matter.
Bipolar proton transfer reaction mass spectrometry detection principle diagram of organic matter
This work is published in the article "Detection of ketones by a novel technology: dipolar proton transfer reaction mass spectrometry (DP-PTR-MS)" Journal of the American Society for Mass Spectrometry (DOI: 10.1007 / s13361 -017-1638-7).
For a long time, high-end on-line mass spectrometry (PMS), represented by proton transfer reaction mass spectrometry (PTR-MS), has played an important role in the field of environment, biology, healthcare, public safety and other fields. Detection provides a highly sensitive technical means. The working principle of PTR-MS is to convert VOCs into [VOC + H] + by proton transfer reactions between H3O + ions and the analyte VOCs to achieve VOC ionization and subsequent mass spectrometry detection. As the positive reaction ion H3O + in PTR-MS almost does not react with inorganic matter, for this reason, the spectral mass spectrometry laboratory proposed proton extraction reaction mass spectrometry (PER-MS) technology in advance, and prepared the negative reaction ion OH- to realize the organic substance Simultaneous measurement of inorganic substances.
Spectra Mass Spectrometry Laboratory researchers developed bipolar proton transfer reaction mass spectrometry (DP-PTR-MS) technology, the mass spectrometer has a switchable PTR-MS and PER-MS two modes of operation, through the positive and negative ions coordinated detection, Enhanced organic matter recognition. For example, the PTR-MS mode transforms M into a positive ion [M + H] + (m / l) for the detection of ketones M, while M-1 converts the M to negative ions [MH] (Mass ratio of m-1), through the two modes under the positive and negative ion charge-mass ratio of this unique pattern of mutual support, the molecular weight of the ketone to be tested M can be accurately identified as m. The newly developed DP-PTR-MS technology not only detects organic / inorganic substances, but also enhances the ability to identify organic compounds.
The work applied for invention patents, and has received the National Natural Science Foundation, the state's key research and development projects such as project support.
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