Abstract
Nitrogen-containing compounds are important components in human breath. However, their origins have not yet been clearly understood. In this study, a modified electrospray ionization (ESI) source coupling with quadrupole time-of-flight mass spectrometry has been used for breath analysis. Fourteen nitrogen-containing compounds were identified in mouth-exhaled breath, and 10 of them were from the oral cavity and oropharynx. Moreover, 8 of these nitrogen-containing compounds were recognized as endogenous metabolites. This result provides important clues for exploring the biological origins of these nitrogen-containing compounds. Observation of the ion suppression phenomenon also indicates that breath analysis should be carried out after clearing of the oral cavity and oropharynx, or directly through nose-breathing to eliminate the influence of those nitrogen-containing compounds from the oral cavity.
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Acknowledgments
This study was funded by the Key Program of 13th five-year plan, CASHIPS (No. KP-2017-25), Provincial Natural Foundation of Anhui Province (No. 1808085MF169) and the Natural Science Research Project of Anhui Universities (No. KJ2018A0086).
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Zhou, W., Hong, Y., Zou, X. et al. Analysis of Nitrogen-containing Compounds in Mouth-exhaled Breath by Electrospray Ionization Quadrupole Time-of-Flight Mass Spectrometry. ANAL. SCI. 35, 1155–1159 (2019). https://doi.org/10.2116/analsci.19N018
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DOI: https://doi.org/10.2116/analsci.19N018