Ecole des Sciences Criminelles, Université de Lausanne, Switzerland.
Centre for Forensic Science, University of Technology Sydney, Australia.
Forensic Sci Int. 2023 Jul;348:111709. doi: 10.1016/j.forsciint.2023.111709. Epub 2023 Apr 26.
The lipid composition of natural fingermarks was studied and compared with the composition of groomed residue. Approximately 100 specimens were collected from 6 donors over three sessions (in October, December and July) and analysed using gas chromatography / mass spectrometry (GC/MS). The measured lipid content was generally lower and more variable in natural fingermarks than in groomed fingermarks. Some significant variability was noticed. Relative standard deviations were the highest between donors (generally above 100%) but were also relatively high within donor within a session (from 21% to 80%) and between sessions (from 34% to 126%). The fingermarks from one of the donors generally contained higher relative amounts of lipids in both groomed and natural residue compared to the others. All other fingermarks led to very variable amounts and did not allow classifying the other donors as constantly "good" or "poor" donors. Squalene was the major compound in all marks, particularly in groomed specimens. A correlation between squalene, cholesterol, myristic acid, palmitoleic acid, stearyl palmitoleate and pentadecanoic acid was highlighted. Oleic and stearic were also correlated together but generally more in natural than groomed marks. The obtained results may be particularly useful to better understand the detection mechanisms for techniques targeting lipids and to develop artificial fingermark secretions to further support the development of detection techniques.
研究了天然指印的脂质组成，并将其与修饰后的残留物的组成进行了比较。从 6 名供体中收集了大约 100 个标本，在三个时间段（10 月、12 月和 7 月）进行了分析，使用气相色谱/质谱（GC/MS）进行分析。与修饰后的指印相比，天然指印中的测量脂质含量通常较低且变化较大。注意到一些明显的差异。相对标准偏差在供体之间最高（通常高于 100%），但在同一时间段内的供体（从 21%到 80%）和不同时间段之间（从 34%到 126%）也相对较高。与其他供体相比，其中一位供体的指印在修饰和天然残留物中通常含有更高相对含量的脂质。所有其他指印的含量变化很大，无法将其他供体归类为始终“良好”或“较差”的供体。角鲨烯是所有标记物中的主要化合物，特别是在修饰的标本中。角鲨烯、胆固醇、肉豆蔻酸、棕榈油酸、硬脂酰棕榈油酸和十五烷酸之间存在相关性。油酸和硬脂酸也相互关联，但通常在天然标记物中比在修饰标记物中更为常见。获得的结果可能对更好地理解针对脂质的检测技术的检测机制以及开发人工指印分泌物以进一步支持检测技术的发展特别有用。
