Fingerprinting Analytics Ltd., 35, Park Road South, Chester le Street, DH3 3LS, United Kingdom.
Forensic Sci Int. 2012 Sep 10;221(1-3):84-91. doi: 10.1016/j.forsciint.2012.04.007. Epub 2012 Apr 30.
The ability of two mass spectrometric methods, surface-assisted laser desorption/ionization-time of flight-mass spectrometry (SALDI-TOF-MS) and direct analysis in real time (DART-MS), to detect the presence of seven common explosives (six nitro-organic- and one peroxide-type) in spiked latent fingermarks has been examined. It was found that each explosive could be detected with nanogram sensitivity for marks resulting from direct finger contact with a glass probe by DART-MS or onto stainless steel target plates using SALDI-TOF-MS for marks pre-dusted with one type of commercial black magnetic powder. These explosives also could be detected in latent marks lifted from six common surfaces (paper, plastic bag, metal drinks can, wood laminate, adhesive tape and white ceramic tile) whereas no explosive could be detected in equivalent pre-dusted marks on the surface of a commercial lifting tape by the DART-MS method due to high background interference from the tape material. The presence of TNT and Tetryl could be detected in pre-dusted latent fingermarks on a commercial lifting tape for up to 29 days sealed and stored under ambient conditions.
两种质谱方法，即表面辅助激光解吸/电离飞行时间质谱（SALDI-TOF-MS）和实时直接分析（DART-MS），检测加标潜伏指纹中七种常见爆炸物（六种硝基有机和一种过氧化物）存在的能力已经过检验。结果发现，通过 DART-MS 直接用手指接触玻璃探针或使用 SALDI-TOF-MS 将一种商用黑色磁性粉末预撒粉的标记，每种爆炸物都可以检测到纳克级的灵敏度。这些爆炸物也可以在从六种常见表面（纸张、塑料袋、金属饮料罐、层压板、胶带和白色瓷砖）提取的潜伏标记中检测到，而在商业提取带上相同的预撒粉标记中，由于来自提取带材料的高背景干扰，DART-MS 方法无法检测到任何爆炸物。在环境条件下密封并储存长达 29 天的商用提取带上的预撒粉潜伏指纹中，仍可以检测到 TNT 和特屈儿的存在。
