Analysis of sexual assault evidence by ambient mass spectrometry: a statistical comparison between DESI-MS and EASI-MS

摘要

Discrimination between condom brands and types is possible with high prediction percentages using both DESI-MS and EASI-MS. Although the difference is only small, EASI-MS allows for a higher discrimination respect to DESI-MS. For this reason EASI-MS should be preferred in the analysis of condom traces, while DESI gives more advantages in imaging analyses in terms of sample preservation and image resolution. The absence of any sample preparation technique avoids contamination, with the possibility to perform successive analyses on the same sample with other techniques.