Curcumin/kaolin composite for advanced latent fingerprint imaging with fluorescence quantification†

IF 3.6 3区 化学 Q2 CHEMISTRY, ANALYTICAL
Analyst Pub Date : 2024-12-23 DOI:10.1039/D4AN01395F
Jiujiang Wang, Dawu Li, Jianghua Zhang, Zijian Gao and Jinke Han
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引用次数: 0

Abstract

Latent fingerprints (LFPs) are invisible impressions that need to be developed before being used for criminal investigation; however, existing fingerprint visualization techniques face challenges, such as complex preparation and poor contrast. To advance practical fingerprint detection, green-emissive micron-sized curcumin/kaolin composites were synthesized via a facile and cost-effective one-step physical cross-linking method, which exhibited unprecedented performance in developing diversified marks, including LFPs, knuckle prints, palm prints, and footprints, with clear three-level details on various substrates. Notably, the powders successfully developed LFPs that were aged for 30 days and even up to 100 days, meeting the stringent requirements for comprehensive forensic application. Afterward, a novel method, termed Fingerprint Fluorescence Intensity Ratio (FFIR), was developed to quantify the contrast between fingerprint signals and background noise and to compare the efficacy of full-color developing agents. Compared with the existing grayscale conversion strategy, the proposed FFIR method achieved tunable multi-color fingerprint image enhancement for the first time, which helped to eliminate background fluorescence interference and improved visual perception. The feasibility of FFIR and its sensitivity in tracking image capture parameters were demonstrated by the established mathematical model. Hence, the newly synthesized modified composites and the mathematical model-validated method demonstrate profound practical significance in comprehensive fingerprint imaging.

Abstract Image

姜黄素/高岭土复合材料用于荧光定量高级潜在指纹成像
潜在指纹(lfp)是指在用于刑事侦查之前需要显影的隐形印痕;然而,现有的指纹可视化技术存在制备复杂、对比度差等问题。为了推进指纹检测的实用化,采用简单、经济的一步物理交联方法合成了绿色发射的微米级姜黄素/高岭土复合材料,该复合材料在多种基材上具有前所未有的性能,可以显示多种标记,包括lfp、指关节指纹、手掌指纹和脚印,并具有清晰的三级细节。值得注意的是,成功开发的lfp粉末可以老化30天,甚至长达100天,满足全面法医应用的严格要求。随后,提出了一种新的方法,称为指纹荧光强度比(FFIR),用于量化指纹信号和背景噪声之间的对比度,并比较全彩显影剂的效果。与现有的灰度转换策略相比,本文提出的FFIR方法首次实现了可调的多色指纹图像增强,有助于消除背景荧光干扰,提高视觉感知。建立的数学模型验证了FFIR在跟踪图像捕获参数方面的可行性和灵敏度。因此,新合成的改性复合材料和数学模型验证方法在指纹综合成像中具有深远的现实意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Analyst
Analyst 化学-分析化学
CiteScore
7.80
自引率
4.80%
发文量
636
审稿时长
1.9 months
期刊介绍: "Analyst" journal is the home of premier fundamental discoveries, inventions and applications in the analytical and bioanalytical sciences.
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