Bouldin K K, Menzel E R, Takatsu M, Murdock R H
Center for Forensic Studies and Department of Physics, Texas Tech University, Lubbock 79409-1051, USA.
J Forensic Sci. 2000 Nov;45(6):1239-42.
The chemical development of latent fingerprints by nanocomposites that involve photoluminescent cadmium sulfide nanoparticle aggregates with Starburst dendrimer is demonstrated. The dendrimer bonds to fingerprint residue via its terminal functional groups. When these are amino groups (generation 4 dendrimer), the binding is enhanced by fingerprint pre-treatment with diimide. The diimide converts carboxylic acid moieties of the fingerprint residue to esters that then react with the dendrimer amino groups to form amide linkages. The cadmium sulfide/generation 4 dendrimer development of fingerprints is enhanced by elevated temperature also. Finally, fingerprint development with carboxylate-functionalized cadmium sulfide/generation 3.5 dendrimer nanocomposites is examined. Here, diimide treatment of the dendrimer itself aids the subsequent fingerprint labeling, which involves amino acid of the figerprint residue. Nanocomposite fingerprint detection is compatible with time-resolved imaging for background fluorescence elimination.
本文展示了通过包含光致发光硫化镉纳米颗粒聚集体与星爆树枝状大分子的纳米复合材料对潜指纹进行化学显影的方法。树枝状大分子通过其末端官能团与指纹残留物结合。当这些官能团为氨基（第4代树枝状大分子）时，通过用二亚胺对指纹进行预处理可增强结合。二亚胺将指纹残留物的羧酸部分转化为酯，然后酯与树枝状大分子的氨基反应形成酰胺键。升高温度也可增强硫化镉/第4代树枝状大分子对指纹的显影效果。最后，研究了用羧酸盐功能化的硫化镉/第3.5代树枝状大分子纳米复合材料进行指纹显影。在此，对树枝状大分子本身进行二亚胺处理有助于后续的指纹标记，这涉及指纹残留物中的氨基酸。纳米复合材料指纹检测与时间分辨成像兼容，可消除背景荧光。
