Citation: SHI Jun-Wen, ZHENG Ling-Na, MA Rong-Liang, WANG Bing, CHEN Han-Qing, WANG Meng, WANG Hai-Fang, FENG Wei-Yue. Chemical Analysis and Imaging of Fingerprints by Air-flow Assisted Desorption Electrospray Ionization Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(12): 1909-1914. doi: 10.19756/j.issn.0253-3820.191390
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Fingerprint analysis is of great significance in forensic sciences. Compared with existing fingerprint analytical methods, mass spectrometry-based methods can not only identify trace chemical components in fingerprints, but also obtain fingerprint imaging. In this study, four kinds of fingerprints, including sweat, inkpad, sunscreen, and liquid foundation, were analyzed by air-flow assisted desorption electrospray ionization mass spectrometry imaging (AFADESI-MSI). AFADESI was employed with the air flow of 45 L/min and 5 μL/min acetonitrile was used as spray solvent at spray voltage 7000 V. Positive ion full scan mode (100-1000 Da) was chosen. The results showed that AFADESI-MSI technology could not only obtain chemical information of various endogenous and exogenous substances in fingerprints, but also obtain high resolution images of fingerprints. In addition, overlapped fingerprints could be distinguished according to the typical chemical information in fingerprints. As a new fingerprint analysis method, AFADESI-MSI will be widely used in forensic scientific research and practical applications.
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