The use of an optimized DRIFTS-FTIR method for the forensic analysis and classification of silicone condom lubricants

Condom residues may be encountered in forensic investigations as traces left sexual assault or rape cases. Considering casework samples analysis, where material from swabs will need to extracted, Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) was reported the most relevant method for trace evidence analysis. However, there has been no study identify which specific parameters were suitable analysis of silicone-based lubricants, especially terms repeatability analyses. This looked at resolution and number scans with aim optimizing these polydimethylsiloxane (PDMS) detection. Experimental refined while performing a full factorial experimental design (FFD) screening extended face centered central composite (FCCD) optimisation. Repeatability results also investigated using principal component (PCA) hierarchical cluster (HCA) order select analytical parameters. The optimized DRIFTS then used collect data reference after transfer vaginal matrix occurred. Discrimination models built compared pre-existing Attenuated Total (ATR)-FTIR data. recovered volunteers who had intercourse different types silicone-lubricated condoms. corresponding characteristics analysed.