Keywords :
GC × GC–MS; headspace; natural substances; optimization; prehistory; Dynamic headspace; Dynamic headspace sampling; Gaschromatography-mass spectrometry; GC × gas chromatography–mass spectrometry; Headspaces; Identification method; Natural substance; Optimisations; Pine resin; Prehistory; Analytical Chemistry; Filtration and Separation
Abstract :
[en] The characterization of Paleolithic adhesives holds great potential for understanding human behavior and its evolution. Gas chromatography–mass spectrometry (GC–MS) is the most accurate identification method; unfortunately, it is destructive and requires a large sample size. Hence, most Paleolithic adhesives are not characterized with GC–MS. Here, a new nondestructive identification method is introduced; dynamic headspace (DHS) with two-dimensional GC coupled to a time-of-flight MS. The DHS extraction is optimized with an experimental design approach. Four parameters were selected, and the optimized values were as follows: incubation temperature: 50°C, incubation time: 20 min, purge volume: 450 mL, and purge flow: 22.5 mL min−1, pine resin was chosen as a proxy for Paleolithic adhesives. Subsequently, DHS was also tested on hide glue, which has less volatile than pine resin, and the universality of the extraction was tested. With untargeted techniques, a distinction between hide glue and pine resin could be made based on their chromatographic profiles. Lastly, DHS was tested against an existing HS-solid-phase microextraction method. DHS showed a higher response in the total area of the chemical groups of interest. Thus, DHS has a higher sensitivity for prehistoric adhesives than solid-phase microextraction, which is desired for minimal samples.
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