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Dye-doped cellulose nanocrystals as novel dusting powders for visualizing latent fingerprints
Analytical Methods ( IF 2.7 ) Pub Date : 2024-08-06 , DOI: 10.1039/d4ay00923a Xu Yao 1 , Guo-Rui Li 1 , Jiu-Jiang Wang 2, 3 , Cheng Tang 1 , Da-Wu Li 2, 3 , Nan You 1 , Wei Mao 1 , Zhan-Chao Li 4 , Si-Qi Zhang 5
Analytical Methods ( IF 2.7 ) Pub Date : 2024-08-06 , DOI: 10.1039/d4ay00923a Xu Yao 1 , Guo-Rui Li 1 , Jiu-Jiang Wang 2, 3 , Cheng Tang 1 , Da-Wu Li 2, 3 , Nan You 1 , Wei Mao 1 , Zhan-Chao Li 4 , Si-Qi Zhang 5
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Powder-dusting method based on the visual contrast between the background surface and powder-covered ridges of a fingerprint is widely used to develop the invisible latent fingerprints (LFPs) left at crime scenes. Recently, the development of nano-sized powders with excellent optical performances has been extensively explored. In this work, we employed environmentally friendly and low-toxicity cellulose nanocrystals as the novel support. Using dye-doped cellulose nanocrystals as novel dusting powders, two dyes (phenylfluorone and curcumin) were adsorbed on the cellulose nanocrystals by a simple batch adsorption method. The dye-doped cellulose nanocrystals (namely, phenylfluorone-doped cellulose nanocrystals (PDCN) and curcumin-doped cellulose nanocrystals (CDCN)) containing 2% of the loaded mass of both the dyes with bright green fluorescence were developed to visualize LFPs on the surfaces of various substrates (such as glass slide, printing paper, orange plastic card, tile, stainless steel, compact disc, red plastic packing, copper foil and aluminum foil). Images of the LFPs can been obtained by both the dye-doped cellulose nanocrystals with sufficient affinity to the ridges of LFPs. High-quality ridge details with features at the second and third level can be detected by CDCN, whereas PDCN only display the secondary-level features of ridge details. Compared with PDCN, CDCN illustrate higher sensitivity, higher selectivity, and better contrast, especially for detecting fresh and non-fresh LFPs on porous and non-porous substrates, and has the potential for practical use in forensic science.
中文翻译：
染料掺杂纤维素纳米晶体作为新型除尘粉末，用于可视化潜在指纹
基于背景表面和指纹粉末覆盖的脊线之间的视觉对比的粉末喷粉方法被广泛用于开发犯罪现场留下的不可见的潜在指纹（LFP）。近年来，具有优异光学性能的纳米粉末的开发得到了广泛的探索。在这项工作中，我们采用环保且低毒的纤维素纳米晶体作为新型载体。使用染料掺杂的纤维素纳米晶作为新型扑粉，通过简单的批量吸附方法将两种染料（苯基荧光酮和姜黄素）吸附在纤维素纳米晶上。染料掺杂的纤维素纳米晶体（即苯基氟酮掺杂的纤维素纳米晶体（PDCN）和姜黄素掺杂的纤维素纳米晶体（CDCN））含有2%的两种染料的负载质量，具有亮绿色荧光，用于在表面上可视化LFP各种基材（如载玻片、打印纸、橙色塑料卡、瓷砖、不锈钢、光盘、红色塑料包装、铜箔和铝箔）。通过对 LFP 脊具有足够亲和力的染料掺杂纤维素纳米晶体可以获得 LFP 的图像。 CDCN 可以检测到具有第二级和第三级特征的高质量脊线细节，而 PDCN 只能显示脊线细节的二级特征。与PDCN相比，CDCN具有更高的灵敏度、更高的选择性和更好的对比度，尤其适用于检测多孔和无孔基质上的新鲜和非新鲜LFP，在法医学中具有实际应用的潜力。
更新日期：2024-08-06
中文翻译：
染料掺杂纤维素纳米晶体作为新型除尘粉末，用于可视化潜在指纹
基于背景表面和指纹粉末覆盖的脊线之间的视觉对比的粉末喷粉方法被广泛用于开发犯罪现场留下的不可见的潜在指纹（LFP）。近年来，具有优异光学性能的纳米粉末的开发得到了广泛的探索。在这项工作中，我们采用环保且低毒的纤维素纳米晶体作为新型载体。使用染料掺杂的纤维素纳米晶作为新型扑粉，通过简单的批量吸附方法将两种染料（苯基荧光酮和姜黄素）吸附在纤维素纳米晶上。染料掺杂的纤维素纳米晶体（即苯基氟酮掺杂的纤维素纳米晶体（PDCN）和姜黄素掺杂的纤维素纳米晶体（CDCN））含有2%的两种染料的负载质量，具有亮绿色荧光，用于在表面上可视化LFP各种基材（如载玻片、打印纸、橙色塑料卡、瓷砖、不锈钢、光盘、红色塑料包装、铜箔和铝箔）。通过对 LFP 脊具有足够亲和力的染料掺杂纤维素纳米晶体可以获得 LFP 的图像。 CDCN 可以检测到具有第二级和第三级特征的高质量脊线细节，而 PDCN 只能显示脊线细节的二级特征。与PDCN相比，CDCN具有更高的灵敏度、更高的选择性和更好的对比度，尤其适用于检测多孔和无孔基质上的新鲜和非新鲜LFP，在法医学中具有实际应用的潜力。
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