Hong Sungwook, Hong Ingi, Han Aleum, Seo Jin Yi, Namgung Juyoung
Graduate School of Forensic Sciences, Soonchunhyang University, Asan, 336-745, Korea.
Graduate School of Forensic Sciences, Soonchunhyang University, Asan, 336-745, Korea.
Forensic Sci Int. 2015 Dec;257:403-408. doi: 10.1016/j.forsciint.2015.10.005. Epub 2015 Oct 28.
In order to study fingerprinting in the field of forensic science, it is very important to have two or more latent fingerprints with identical chemical composition and intensity. However, it is impossible to obtain identical fingerprints, in reality, because fingerprinting comes out slightly differently every time. A previous research study had proposed an artificial fingerprint creation method in which inkjet ink was replaced with amino acids and sodium chloride solution: the components of human sweat. But, this method had some drawbacks: divalent cations were not added while formulating the artificial sweat solution, and diluted solutions were used for creating weakly deposited latent fingerprint. In this study, a method was developed for overcoming the drawbacks of the methods used in the previous study. Several divalent cations were added in this study because the amino acid-ninhydrin (or some of its analogues) complex is known to react with divalent cations to produce a photoluminescent product; and, similarly, the amino acid-1,2-indanedione complex is known to be catalyzed by a small amount of zinc ions to produce a highly photoluminescent product. Also, in this study, a new technique was developed which enables to adjust the intensity when printing the latent fingerprint patterns. In this method, image processing software is used to control the intensity of the master fingerprint patterns, which adjusts the printing intensity of the latent fingerprints. This new method opened the way to produce a more realistic artificial fingerprint in various strengths with one artificial sweat working solution.
为了研究法医学领域的指纹识别技术，拥有两个或更多化学成分和强度相同的潜在指纹非常重要。然而，在现实中不可能获得完全相同的指纹，因为每次提取的指纹都会略有不同。此前的一项研究提出了一种人工指纹创建方法，即用氨基酸和氯化钠溶液（人类汗液的成分）替代喷墨油墨。但是，这种方法存在一些缺点：在配制人工汗液溶液时未添加二价阳离子，并且使用稀释溶液来创建沉积较弱的潜在指纹。在本研究中，开发了一种方法来克服先前研究中所用方法的缺点。本研究中添加了几种二价阳离子，因为已知氨基酸 - 茚三酮（或其某些类似物）络合物会与二价阳离子反应生成光致发光产物；同样，已知氨基酸 - 1,2 - 茚满二酮络合物会被少量锌离子催化生成高光致发光产物。此外，在本研究中，还开发了一种新技术，能够在打印潜在指纹图案时调整强度。在这种方法中，使用图像处理软件来控制母指纹图案的强度，从而调整潜在指纹的打印强度。这种新方法为使用一种人工汗液工作溶液以各种强度生成更逼真的人工指纹开辟了道路。
