A study of the intermolecular interactions of lipid components from analogue fingerprint residues

Chemical Profiling and Wetting Behaviors of Endemic Salvia absconditiflora Greuter & Burdet (Lamiaceae) Collected from Gypsum Areas

“…In this case, where the hydroxyl band of gypsum (54,55), whose intensity can be measured, differs for each plant parts, it was shown that the amount of gypsum varied in the root, stem, leaf, petiole, and flower. Likewise, the observation of differences in the band intensities of symmetric and asymmetrical aliphatic carbons, which are the basis of oils, waxes, and lipids, showed that the plant parts have different chemical contents (56,57). In general, the presence of each specific band was detected in the ATR-FTIR spectra taken, but it was understood that the same trend was observed for all plant parts where the band intensities were different.…”

Controlling fingermark variability for research purposes: A review

“…A large number of papers have dealt with fingermark composition and their variability factors such as, the age or the gender of the donor, among other (Antoine, Mortazavi, Miller, & Miller, ; Asano, Bayne, Horsman, & Buchanan, ; Bohanan, ; Buchanan, Asano, & Bohanon, ; Cadd et al, ; Croxton, Baron, Butler, Kent, & Sears, , ; Frick, Chidlow, Lewis, & van Bronswijk, ; Fritz et al, ; Girod et al, ; Girod & Weyermann, ; Huynh, Brunelle, Halámková, Agudelo, & Halámek, ). New analytical techniques such as gas chromatography–mass spectrometry (GC–MS) (Croxton et al, ; Girod & Weyermann, ; Richmond‐Aylor, Bell, Callery, & Morris, ; Weyermann, Roux, & Champod, ) or Fourier‐transform infrared spectroscopy (Fritz et al, ; Johnston & Rogers, , ) allow even more compounds to be detected and their interactions analyzed. However, this variability remains an important factor that must be taken into account when treating a latent fingermark with a particular detection technique since an unsatisfactory detection can be due to the intrinsic composition of the mark (i.e., a lack of certain compounds targeted by a specific technique) and not necessarily to a bad formulation or an ineffective working solution.…”

“…Because of the large number of different compounds found in fingermark residue, studying the interactions occurring between the components found in eccrine and sebaceous secretions is a complex task. For this reason, some researchers have used simplified formulations, by mixing only the most abundant compounds of each type of secretions, to render the observations less labor intensive (Johnston & Rogers, , ). It is a good starting point and can indeed be helpful in some situations but such simplified simulants are mostly useful for fingermark residue studies (i.e., not fingermark detection studies).…”

“…Observations of interactions between fingermark constituents themselves can also be facilitated by using simplified formulations. Johnston and Rogers studied the effects of moderate temperatures on latent fingermark chemistry (Johnston & Rogers, 2017a) as well as the intermolecular interactions of lipid components from fingermarks (Johnston & Rogers, 2017b) by using analog fingermark residues. This simplified formulation allowed them to highlight, among others, the impact of the absence of squalene and cholesterol in the intermolecular reactions of fingermark compounds.…”