Levin-Elad Michal, Liptz Yakir, Bar-Or Karni L, Almog Joseph
Latent Fingerprint Laboratory, Division of Identification and Forensic Science (DIFS), Israel police, National H.Q., Jerusalem, 9780204, Israel.
Fingerprint Identification and AFIS Laboratory, Division of Identification and Forensic Science (DIFS), Israel police, National H.Q., Jerusalem, 9780204, Israel.
Forensic Sci Int. 2017 Feb;271:8-12. doi: 10.1016/j.forsciint.2016.12.007. Epub 2016 Dec 14.
1,2-Indanedione has been extensively researched since the discovery of its fluorogenic reaction with amino acids in 1997 by Joullié et al. [1]. This current study compares the development of fingermarks on used train tickets by the three leading reagents for amino acids-ninhydrin, DFO and 1,2-indanedione. The train tickets are ideal for the task due to their high abundance and frequent use by a diverse population. However, their unique double-layer composition of a cellulose-based regular paper on one side and a thermally sensitive layer on the other requires an adjustment of the traditional development procedures. Heat, which is normally applied after dipping the specimens in the reagents solutions, had to be avoided due to darkening of the sensitive thermal layer. Instead, it has been replaced by air-drying in a fume-hood 24h prior to the recording of the results. Three groups, each containing 500 used train tickets had been treated by each of the three reagents. The results were expressed in terms of percentage of both comparable and partial fingermarks. In this study we controlled neither the quality of the fingerprint donors nor the conditions under which the latent fingermarks had been deposited or stored. However, the large number of similar exhibits which are randomly chosen allows tentative conclusions on the potential of each reagent, hence, a new criterion for the potential of fingermark development (PFD) is proposed. The PFD combines all the partial fingermarks and identifiable fingermarks (graded 1 and 2) thus, highlighting the sensitivity of the reagents. In this work, the superiority of 1,2-indanedione is demonstrated using both the traditional comparison tests as well as the suggested "PFD".
自1997年朱利耶等人发现1,2 -茚二酮与氨基酸的荧光反应以来，人们对其进行了广泛研究。[1]本研究比较了三种用于检测氨基酸的主要试剂——茚三酮、DFO和1,2 -茚二酮——在使用过的火车票上指纹显现情况。火车票非常适合这项任务，因为其数量众多且不同人群频繁使用。然而，火车票独特的双层结构，一面是纤维素基普通纸张，另一面是热敏层，这就需要对传统的显现程序进行调整。由于热敏层会因受热变黑，通常在将样本浸入试剂溶液后施加的加热步骤必须避免。取而代之的是，在记录结果前24小时，在通风橱中进行空气干燥。三组，每组包含500张使用过的火车票，分别用三种试剂中的一种进行处理。结果以可比指纹和部分指纹的百分比表示。在本研究中，我们既没有控制指纹提供者的质量，也没有控制潜在指纹沉积或存储的条件。然而，大量随机选取的类似样本使得我们能够对每种试剂的潜力得出初步结论，因此，提出了一种新的指纹显现潜力（PFD）标准。PFD将所有部分指纹和可识别指纹（分为1级和2级）结合起来，从而突出了试剂的灵敏度。在这项工作中，通过传统的比较测试以及建议的“PFD”都证明了1,2 -茚二酮的优越性。
