Fingerprints found at a crime scene can be key in criminal investigations. A method to accurately determine the age of the fingerprint, potentially crucial to linking the fingerprint to the crime, is not available at the moment. In this paper, we show that the use of the enantiomeric ratio of D/L-serine in fingerprints could pose as interesting target for age estimation techniques. We developed a UPLC-MS/MS method to determine the enantiomer ratios of histidine, serine, threonine, alanine, proline, methionine and valine from fingerprint residue. We found a significant change only in the relative ratio of D-serine with increasing fingerprint age after analysis of fingerprints up to 6 months old.

中文翻译：

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老化指纹图谱分析氨基酸对映体

在犯罪现场发现的指纹可能是刑事调查的关键。目前尚无法提供一种准确确定指纹年龄的方法，该方法对于将指纹与犯罪联系起来可能至关重要。在本文中，我们表明指纹中D / L-丝氨酸的对映体比率的使用可能会成为年龄估计技术的有趣目标。我们开发了一种UPLC-MS / MS方法，从指纹图谱中确定组氨酸，丝氨酸，苏氨酸，丙氨酸，脯氨酸，蛋氨酸和缬氨酸的对映体比率。在分析长达6个月的指纹后，我们发现D-丝氨酸的相对比率仅随指纹年龄的增加而发生显着变化。