利用解吸电喷雾电离-质谱成像技术(DESI-MSI)检验添改文件1例  

A Case of Alteration Documents Examination Using DesorptionElectrospray Ionization-Mass Spectrometry Imaging(DESI-MSI)Technology

作　　者：袁逸婷 陈莹[2] 黄光明[2] 秦达 YUAN Yiting;CHEN Ying;HUANG Guangming;QIN Da(Institute of Forensic Science of Anhui Public Security Department,Hefei 230001,China;University of Science and Technology of China,Hefei 230001,China;Institue of Forensic Science,Ministry of Public Security,Beijing 100038,China)

机构地区：[1]安徽省公安厅物证鉴定中心,合肥230001 [2]中国科学技术大学,合肥230001 [3]公安部鉴定中心,北京100038

出　　处：《刑事技术》2024年第5期531-536,共6页Forensic Science and Technology

基　　金：安徽省科技强警课题(202104d07020007);中央级公益性科研院所基本科研业务费专项资金项目(2023JB014)。

摘　　要：书写笔字迹成分的差异对于检验可疑文件是否存在添改至关重要。本文针对一起添改文件检验,利用解吸电喷雾电离-质谱成像技术(DESI-MSI)检验可疑字迹,通过成像直观地反映出检材笔迹添改情况,确定可疑字迹的添改部位,并利用化学计量学对字迹成分数据进行了聚类分析。与传统光学检测法、光谱法相比,该方法可检测到书写笔字迹更多的物质信息,为此类案件的鉴定提供了新的思路。Differences in handwriting composition are crucial for recognizing the existence of alterations in questioned document examination.The ambient ionization mass spectrometry is increasingly being recognized for its utility in detecting ink changes,due to its benefi ts such as high speed,rich information,minimal destruction of the sample.In this paper,the desorption electrospray ionization mass spectrometry imaging(DESI-MSI),a prominent technique within ambient ionization mass spectrometry,was used to examine the suspicious handwriting to determine whether the document was altered.The authenticity of the number“1”,suspected of being added to change“2”into“12”,was scrutinized.The mass spectra of strokes of ink were obtained,and the suspicious“1”could differentiate from other numbers.Based on the MS data,the questioned part could be visualized through imaging,clearly demonstrating the evidence of tampering.Additionally,chemometrics were applied to cluster the handwriting composition data,aiding in the identification of the alteration fact.Compared with the traditional optical detection and spectroscopic method,DESI-MSI offered a more comprehensive analysis of the handwriting’s material properties,showcasing its potential for practical application.This technique provides an innovative perspective for examining such cases.

关 键 词：文件检验 添改文件 质谱成像 字迹成分 质谱检验 

分 类 号：DF794.2[政治法律—诉讼法学]