I do know know already Anna.
Trust me on that.
There are many compounds which are present from decomposition and the result largely of hydrolysis of 'proteins' and subsequent decarboxylation of the among no acids produced
My question referred to the mentionng of Urine.
I will be more specific next time when I raise a question mark.
Introduction
The decay process of vertebrates begins rapidly after death (i.e. four minutes after death) [1] and leads to the release of postmortem compounds in the ecosystem [2]–[3].
These cadaveric compounds, mainly volatile organic compounds (i.e. VOCs), are by- or end-products of the decay process [2], [4]. They come from the catabolism of the four major categories of biological macromolecules in living organisms: proteins, nucleic acid, lipids and carbohydrates [2]–[3]. The principal decay pathways and the metabolic origin of the main vertebrate postmortem volatiles were reviewed by Dent and colleagues [5], Boumba and colleagues [6] and recently by Paczkoski and Schütz [4].
However, the metabolic origin of many cadaveric compounds is still unknown [4], [7]. Only a few research groups have studied the postmortem VOCs emanating from human remains [8]–[13] and animal carcasses (pig [7], [14]–[15], mouse [16], rabbit [17]). Nevertheless, the majority of these studies is focused on burial decomposition or in closed environments (“body bag”) and limits the access to the corpse for the necrofauna, mainly insects [7]–[11]. The available information concerning postmortem chemistry of above-ground decomposition is rather limited. Numerous applications would however benefit from a better understanding of the postmortem volatiles emitted during the decay process.(...)
In conclusion, this study provides the first documentation of the use of GCxGC-TOFMS to analyze pig decaying volatile compounds. The use of comprehensive GC could improve the characterization of the smell of death in terms of volatile constitution, rather than conventional GC. Indeed, the complexity of postmortem volatile samples requires more complex analytical methods [25]. Concerning data analysis, it would be interesting to include chemometrics analysis in future work. Nevertheless, the solvent extraction of the volatile organic compounds from the sorbent cartridges as well as the storage of the liquid fraction prior analyses is not adequate for the most volatile polar compounds, compared to the use of thermal desorption techniques, which is currently under investigation. However, our results demonstrated that bi-dimensional gas chromatography coupled with time-of-flight mass spectrometry is a powerful tool to analyze the volatile cadaveric emissions.
Source
Enhanced Characterization of the Smell of Death by Comprehensive Two-Dimensional Gas Chromatography-Time-of-Flight Mass Spectrometry (GCxGC-TOFMS)
Jessica Dekeirsschieter,
Pierre-Hugues Stefanuto,
Catherine Brasseur,
Eric Haubruge,
Jean-François Focant
PLOS
Published: June 18, 2012 DOI: 10.1371/journal.pone.0039005
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0039005?
