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                            Library & Multimedia
 Temperature-Dependent DART-MS Analysis of Sexual Lubricants to Increase Accurate Associations
NCJ Number
              254176
Journal

*Journal of the American Society for Mass Spectrometry* Volume: 30 Issue: 8 Dated: 2019 Pages: 1343-1358
Author(s)
          Candice Bridge;
                        MMark Maric
Date Published

2019
Length
              16 pages
Annotation
              This study used an ambient ionization technique, high-resolution direct analysis in real-time mass spectrometry (HR-DART-MS) to characterize a sample set of 33 water-based sexual lubricants.
Abstract
              The analysis of lubricant evidence is a recent development in sexual assault investigations, and in the absence of any biological evidence may assist in linking an assailant to the victim or crime scene. Since lubricants are complex multicomponent mixtures, this study Examined whether different thermal desorption temperatures could elucidate different additives and provide additional information. A low-temperature, high-temperature, and thermal desorption/pyrolysis DART-MS protocol was used to characterize the water-based lubricant sample set. The strength of the methodologies was assessed using positive and negative likelihood ratios that were calculated from inter- and intra-pairwise comparisons using Pearson correlation coefficients. The low-temperature DART-MS protocol afforded valuable information pertaining to volatile additives (e.g., flavors and fragrances) and provided positive likelihood ratios that would provide strong support for true positive and negatives than the high-temperature protocol when associating between individual samples and samples to their respective sub-groupings. The thermal desorption/pyrolysis DART analytical protocol provided enhanced differentiation between samples due to the precise temperature control using a thermal gradient. Moreover, the total ion spectra obtained from the thermal desorption/pyrolysis protocol had high positive and negative likelihood ratios, as well as the most discrimination, as determined by empirical cross entropy plots. (publisher abstract modified)
      
  
          Additional Details
Grant Number(s)
        2016-NE-BX-0001


  
  
        
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        NIJ-Sponsored


  
  
        
  Publication Type
        Research (Applied/Empirical)
                                Report (Study/Research)
                                Report (Grant Sponsored)
                                Program/Project Description


  
  
        
  Award
        Characterization and Classification of Sexual Assault Lubricants using Direct Analysis in Real Time at Time of Flight Mass Spectrometry
    
  
  
Date Published: January 1, 2019
    
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