Laboratory for Forensic Chemistry, Jagiellonian University, 3 Ingardena St, 30-060 Krakow, Poland.
Forensic Sci Int. 2011 Oct 10;212(1-3):78-85. doi: 10.1016/j.forsciint.2011.05.017. Epub 2011 Jun 12.
In the process of questioned document examination, the discrimination of inkjet printing inks is becoming more necessary due to increasingly frequent counterfeiting of documents printed by inkjet printers. Therefore, a method based on micellar electrophoretic capillary chromatography (MECC) has been developed and applied to analysis of such inks extracted from paper. With the use of an optimized and validated analytical procedure, multielectropherograms of inks taken from various models of printers made by various producers (Hewlett-Packard, Epson, Brother, Lexmark and Canon) were created. It was shown that effective differentiation of individual inks was possible in terms of migration time, order and specific shapes of characteristic peaks. By comparison of recorded UV-Vis spectra, the identification of main dyes was also achievable. The usefulness of the method was confirmed by an intralaboratory test of utility, in which several forged printouts were successfully examined. The obtained results proved that the proposed procedure is a useful tool that could be applied to ink discrimination and group identification of dyes originating from inkjet printing inks. Consequently, the developed method can be applied in the forensic field, including investigation of the authenticity of documents.
在 questioned document examination 过程中，由于越来越频繁地伪造喷墨打印机打印的文件，因此需要对喷墨打印油墨进行鉴别。因此，已经开发并应用了一种基于胶束电动毛细管色谱 (MECC) 的方法，用于分析从纸张中提取的此类油墨。通过使用优化和验证的分析程序，创建了来自不同制造商（惠普、爱普生、兄弟、利盟和佳能）制造的各种打印机的油墨的多电泳图谱。结果表明，根据迁移时间、特征峰的顺序和特定形状，可以对各个油墨进行有效区分。通过比较记录的紫外-可见光谱，还可以实现主要染料的鉴定。通过实验室内部实用性测试，该方法的有效性得到了证实，成功检查了几个伪造的打印件。所得结果证明，所提出的程序是一种有用的工具，可用于鉴别喷墨打印油墨中的油墨和染料的分组识别。因此，该方法可应用于法医领域，包括文件真实性的调查。
