CdS/PAMAM与氨基酸作用研究及其在潜在指印显现中的应用

提出了以硫化镉/聚酰胺-胺树形分子(CdS/PAMAM)纳米复合材料显现潜在指印的新方法。傅里叶变换光谱研究了PAMAM G4.5外部酯端基与氨基酸中胺基之间的胺解反应，选用相对峰高比H_{1 267/1 735}来监测不同条件下的反应进程，并发现温度对于胺解反应的影响很大，90 ℃时胺解反应可在4h内显著进行，120 ℃时胺解反应速率在3 h后发生递减。将CdS/PAMAM作为指印显现试剂，在同等条件下与现有常规指印显现液对比，发现前者的荧光强度约为后者的65倍，荧光性能优势明显。确定使用加热压显法显现不同客体表面潜在指印的条件为120 ℃下反应0.5～3 h。使用优化后的条件对多种载体表面潜在指印进行显现，可以获得理想的显现效果。该显现方法具有简便、快速、灵敏、安全、经济等特点。

Study on Amidation Reaction between CdS/PAMAM and Amino Acid and Its Application to Latent Fingerprint Development

A new method for the development of latent fingerprints by CdS/PAMAM nanocomposites was explored in the present research. Amidation reaction between terminal carboxylate groups of amino acids and terminal amino groups of PAMAM G4.5 dendrimers was studied by FTIR spectrometry. The reacting processes under different conditions were monitored by H_{1 267/1 735} (the relative ratio of peak height) in order to find out the optimized condition and developing method. The results indicated that the reacting processes were affected remarkably by the changes in temperature. The reaction was efficient under 90 ℃ within 4 hours, while the reacting speed decreased after 3 hours under 120 ℃. CdS/PAMAM was utilized as the latent fingerprint developing reagent and compared with the routine one. The results indicated that the fluorescence intensity of the former is 65 times higher than that of the latter. Great predominance in florescence could be observed when CdS/PAMAM and the routine developing reagent were compared. Latent fingerprints on the surface of different objects were developed under 120 ℃ within 0.5-3 h. Good developing results could be obtained under the optimized condition. The method is simple, rapid, highly sensitive, safe and economical.