Implementing Raman Spectroscopy as a tool to characterize sexual lubricants

Autor: Candice Bridge, Nicholas Andersen, Santana A.L. Thomas, Mark Maric
Rok vydání: 2021
Předmět:
Zdroj: Forensic Chemistry. 24:100329
ISSN: 2468-1709
DOI: 10.1016/j.forc.2021.100329
Popis: Screening for sexual lubricants as a form of trace evidence is a relatively new methodology in forensic science. With increase of condom use in sexual assault cases, sexual lubricant analyses can prove resourceful. Research has provided confidence with the identification of trace lubricants and further classification based on their chemical constituents using direct analysis in real time–mass spectrometry, gas chromatography–mass spectrometry, and Fourier transform infrared spectroscopy. Statistical analyses coupled with these analytical methods have successfully classified lubricant types based on major components and even further, minor additives such as flavors and anesthetics. As a continuous effort to validate lubricant analysis, this study demonstrates how relatively similar products are distinguishable when chemometric techniques are applied to the data obtained through Raman spectroscopy. Fifty (50) sexual lubricants – 21 personal hygiene products, 12 bottled lubricants, and 17 condoms – were analyzed using Raman spectroscopy and subsequently classified using statistical tools (i.e., principal component analysis, hierarchical cluster analysis and linear discriminant analysis). The evaluation of two classification models yielded a classification accuracy rate of 95.56% and 98.57% for the neat and DCM/MeOH solvent models, respectively, using linear discriminant analysis as a supervised classification method.
Databáze: OpenAIRE
Externí odkaz: