Document authentication at molecular levels using desorption atmospheric pressure chemical ionization mass spectrometry imaging.
Document authentication at molecular levels using desorption atmospheric pressure chemical ionization mass spectrometry imaging.
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DOI：
10.1002/jms.3250
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发表时间：
2013-09
期刊：
影响因子：
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通讯作者：
Ming Li;B. Jia;Liying Ding;Feng Hong;Y. Ouyang;Rui Chen;Shumin Zhou;Huanwen Chen;Xiang Fang
中科院分区：
文献类型：
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作者：
Ming Li;B. Jia;Liying Ding;Feng Hong;Y. Ouyang;Rui Chen;Shumin Zhou;Huanwen Chen;Xiang Fang
通过使用解吸大气压化学电离质谱仪(DAPCI-MS)顺序扫描文件的表面获得文件的分子图像，该解吸大气压化学电离质谱仪在无气、无溶剂或甲醇蒸气辅助模式下操作。通过跟踪DAPCI-MS记录的信号强度来监测用于手写的墨水的衰退过程。测试了四种油墨在四种纸张表面上的笔迹。通过研究墨水的动态衰减，DAPCI-MS成像区分了两个4小时前的样本和10分钟前的样本。根据不同作者个性化签名强度的差异，实现了对手写和计算机辅助伪造签名的无损取证分析。以约140微米的空间分辨率完成了文件上书写/盖章顺序的识别和非法打印的检测。开发了一个MatLab®编写的程序，以便于可视化通过DAPCI-MS获得的签名图像之间的相似性。实验结果表明，DAPCIMS成像在分子水平上提供了丰富的信息，可用于法医应用中可靠的文件分析。
Molecular images of documents were obtained by sequentially scanning the surface of the document using desorption atmospheric pressure chemical ionization mass spectrometry (DAPCI-MS), which was operated in either a gasless, solvent-free or methanol vapor-assisted mode. The decay process of the ink used for handwriting was monitored by following the signal intensities recorded by DAPCI-MS. Handwritings made using four types of inks on four kinds of paper surfaces were tested. By studying the dynamic decay of the inks, DAPCI-MS imaging differentiated a 10-min old from two 4 h old samples. Non-destructive forensic analysis of forged signatures either handwritten or computer-assisted was achieved according to the difference of the contour in DAPCI images, which was attributed to the strength personalized by different writers. Distinction of the order of writing/stamping on documents and detection of illegal printings were accomplished with a spatial resolution of about 140 µm. A Matlab® written program was developed to facilitate the visualization of the similarity between signature images obtained by DAPCI-MS. The experimental results show that DAPCI-MS imaging provides rich information at the molecular level and thus can be used for the reliable document analysis in forensic applications.