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Impact of surface roughness on the deposition of saliva and fingerprint residue on non-porous substrates
Forensic Chemistry ( IF 2.7 ) Pub Date : 2021-02-13 , DOI: 10.1016/j.forc.2021.100318
Deborah A. Hughes , Bianca Szkuta , Roland A.H. van Oorschot , Wenrong Yang , Xavier A. Conlan

A diverse range of non-porous substrate surfaces routinely encountered in crime scene settings were evaluated for their affinity towards deposited saliva and fingerprint residue. Raman spectroscopy, atomic force microscopy (AFM), field-emission scanning electron microscopy (FE-SEM) and water contact angle measurements were employed to quantitatively and qualitatively evaluate the physicochemical variables impacting the deposition of touch and salivary deposits. It was established that small changes in surface roughness and physicochemical interactions, including hydrophobicity, resulted in observable impacts on the spread of salivary deposits and deposition of fingerprint residue. It was further identified that not only did the surface free energy (SFE) available to the deposit, measured through water contact angles, influence the deposition and spread of the material on the surface, but that the nature of the deposit further impacted these dynamics. This preliminary study has developed a platform to gain a better understanding of the importance of surface roughness as a consideration, when interrogating how forensically relevant deposits such as saliva and fingerprint residue interact with non-porous surfaces. This better understanding is necessary when reflecting on the successfulness of recovering DNA, when considering means to improve recovery of trace samples from crime scenes, and when improving assessment of the likelihood of transfer of a deposit from one substrate to another upon contact.



中文翻译:

表面粗糙度对无孔基质上唾液和指纹残留物沉积的影响

评估了在犯罪现场中通常遇到的各种非多孔基质表面对唾液沉积和指纹残留物的亲和力。拉曼光谱,原子力显微镜(AFM),场发射扫描电子显微镜(FE-SEM)和水接触角测量被用来定量和定性地评估影响接触和唾液沉积的理化变量。已经确定,表面粗糙度和物理化学相互作用(包括疏水性)的微小变化会对唾液沉积物的扩散和指纹残留物的沉积产生明显影响。进一步确定,不仅可以通过水接触角来测量沉积物的表面自由能(SFE),影响材料在表面上的沉积和扩散,但沉积物的性质进一步影响了这些动力学。这项初步研究开发了一个平台,以便在询问法医相关沉积物(例如唾液和指纹残留物)如何与无孔表面相互作用时,可以更好地理解表面粗糙度作为考虑因素的重要性。在反思回收DNA的成功性,考虑改进从犯罪现场回收痕量样品的方法以及改进对接触时沉积物从一种基质转移到另一种基质的可能性的评估时,需要更好的理解。这项初步研究开发了一个平台,以便在询问法医相关沉积物(例如唾液和指纹残留物)如何与无孔表面相互作用时,可以更好地理解表面粗糙度作为考虑因素的重要性。在反思回收DNA的成功性,考虑改进从犯罪现场回收痕量样品的方法以及改进对接触时沉积物从一种基质转移到另一种基质的可能性的评估时,需要更好的理解。这项初步研究开发了一个平台,可以在询问法医相关沉积物(例如唾液和指纹残留物)如何与无孔表面相互作用时更好地理解表面粗糙度作为考虑因素的重要性。在思考回收DNA的成功性,考虑改进从犯罪现场回收痕量样品的方法以及改进对接触时沉积物从一种基质转移到另一种基质的可能性的评估时,需要更好的理解。

更新日期:2021-02-18
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